When loudspeakers are wired in series, the impedance or opposition to current flow increases and less power is developed. Put simply, Continuous Power delivers a fixed wattage to a fixed number of ohms, like 50 watts per channel into 4 and 8 ohms. 99 Watts (40 x 40 =1600 1600 / 23. 8 Ohms to the speaker impedance of 100 Ohms (the above 100V system in the Example 1). Capacity: 16 Ohms, 75 watts. Calculates power / voltage / current / resistance. It's difficult to use speakers with different impedances in the same cabinet. The math would look like this: 8 ohms / 2 speakers = 4 ohms total. For a simple circuit, the power dissipated by the circuit is calculated: P = I 2 R , where I is the current through the circuit, in units of Amperes, or Coulomb/sec, and R is the resistance in Ohms. This example shows that in a real world amplifier, the principle of "speaker impedance changes amplifier power output" is true, just not as much as in an ideal amplifier. Ideally, Bob want's 2 x 250 watts = 500 watts for the two subs. The formula is: Power Required = (Quantity Of Speakers x Watts) + 20%. It can either be Direct Current (DC) or the Alternating Current (AC) single phase/ three phase. MPA 152 Plus. Using these two basic formulas, we can calculate to find 2 unknown values if we know any other 2. If you were using (2) 8 ohm speakers you'd have a 16 ohm cabinet. Thick wire (12 or 14 gauge) is recommended for long wire runs, high power applications, and lowimpedance speakers (4 or 6 ohms). Appliance Watts/Amps Calculator Electricity is measured in units of energy called watts, named after James Watt, the inventor of the steam engine. If the speakers are 4 ohms it was 2 watts. A speaker with 4 ohm nominal impedance uses 2W at 2. The ohm (symbol: Ω) is the SI unit of electrical impedance or, in the direct current case, electrical resistance, named after Georg Ohm. depending on the ohms your speakers take up and the wattage the speakers use, tells you what size amp you need. Click here to view image. The law states that "for any circuit the electric current (I) is directly proportional to the voltage (V) and is inversely proportional to the resistance(R)". the watts for 2 ohms is more than 4 ohms. This small 7W Mono Audio Amplifier Kit is constructed around the TDA2003 power audio IC and delivers 7 watts of music power into a 4 ohms load. Unlike speaker amplifiers which are rated using power (watts into 8 ohms), headphone amplifiers are usually rated by how much output VOLTAGE they can deliver, not how much POWER they can deliver. If you were using 2200 watt speakers, you'd have 400 watts of power handling. For example, for an 8 ohm and 4 ohm speaker in series, the power shared is proportional to the resistance, so the 8 ohm speaker absorbs twice the power of the 4 ohm speaker. Where: I = current P = power R = resistance V = voltage. But generally the speaker impedance is already fixed. VAVLE AMP RULE #2: Make sure the Ohm setting on the amp is the same as the speakers (or cabinet). Using your current speaker and power wire, current amp power is calculated, allowing you to see any potential losses (in Watts) with undersized cables. You can start by selecting the type of electric current. With a 4 ohms loudspeaker you generate 2 watts. It can either be Direct Current (DC) or the Alternating Current (AC) single phase/ three phase. Shop with confidence. *Beware that some speaker manufacturers quote sensitivity as 2. Shall provide a frequency range of 70 Hz to 20 kHz, 10 dB. The emx660 has two amp outputs, each capable of driving either 8 or 4 ohms. Current is a measurement of how much charge is moving through a particular point in a unit of time. Forty volts times 40 volts equals 1600. For this calculator to work you’ll need to know the output impedance of your amp as well as the number of speakers used in your cabinet. 4  16 ohm speakers in parallel (4 ohms) then wired in series with a 2  8 ohm speakers that are wired in parallel (4 ohms) = 8 ohm load Warning: the 8 ohm speakers will see 2 times the power that the 16 ohm speakers will see. 2 times higher than it should be. So, we need to be careful about the speaker rating, amplifier rating, speaker efficiency, and impedance. I don't have any way of measuring the inductance though, can anyone give me a ballpark figure to use? Edit: The only refrence. Knowing the wattage of the different components of an. The back panel has a slide switch to select speakers rated for impedances "less than 8 ohms" or "8 ohms or more"; best I can tell, the <8Ω setting of said switch adds a large 10Ω resistor and "phase compensation coil" in series with each channel output. Current is a measurement of how much charge is moving through a particular point in a unit of time. Speaker Impedance, Power Handling and Wiring The speaker ohm rating is an indication of the speaker's AC impedance, which varies with the frequency of the input signal. Of course any of those wire gauges will work for a speaker system, but as the cable run increases the gauge or wire diameter should also increase. Get details of Sweton 40 Watt Speaker, 40 watt Woofer, 8 inch Speaker, 4 ohm including specifications, features and more on Amazon. 60w RMS x 4 amp @4 ohms front speakers 45 RMS @ 4 ohms back speakers 65 RMS @ 4 ohms but I am going to connect them to two channels instead of 4 as stereo only have 2 pre outs (one for sub and one for speakers) wondering how much in series or parallel the watts RMS and ohms output from the amp would be. Enter 100 in the Watts field and 120 in the Voltage field and press Calculate to find the resistance and current. 6,528 results for 4 ohm speakers Save 4 ohm speakers to get email alerts and updates on your eBay Feed. With a 4 ohms loudspeaker you generate 2 watts. Standard speaker impedance values are 4Ω and 8Ω. Match impedances (ohms)  all speakers in the same box should have the same impedance 2. For example, the PSB Synchrony TwoB bookshelf speaker, a small twoway bookshelf design using a 5. AVS Forum  Home Theater Discussions And Reviews > Audio > Speakers > Speaker wire calculator for size, ohms, watts & distance,, Thread Tools: Forum Jump:. A potentiometer can also be wired as a rheostat, or single variable resistance. Ohm's law calculator calculation calculate ohms power formulas mathematical ohm's law pie chart electric voltage drop electric current resistance formula watt's law emf magic triangle tip online voltage volts resistor resistance amps amperes audio engineering E V = I R  P = V I calc conductivity resistivity relation relationship  Eberhard Sengpiel sengpielaudio. yoursoundvideo. If three 4 ohm speakers are connected to an amplifier without coils and capacitors, the amplifier would see a load of 1. For example, an amplifier might be rated at 100 watts per channel to an 8 ohm load and 190 watts to a 4 ohm load. 5" Loud speaker 4 ohm 80 watt peak Full Range Speaker NS352554A. Add up the total ohms for all speaker pairs, which in this example would be 4+4 (8) and 8+8 (16). For the perfect amplifier, one could keep going with this until the load impedance approached zero, at which time the amplifier output would approach infinity!. 5 amps from the amp. If you have 89 db sensitive speakers that are 8 ohms and the sound meter tells you that the sound at any instant was 89 dbs at 1 metre in front of your speakers then your amplifier was delivering 1 watt. The frequency range of our RF attenuators is from DC to 50 GHz. The amp under consideration needs to be (or ought to be) stable into very low impedance loads (< 2 ohms). If you were using 2200 watt speakers, you'd have 400 watts of power handling. Warning: the 4 ohm speakers will see 2 times the power that the 8 ohm speakers will see. This equals 996 watts. For example, to find the Voltage in a circuit: If the circuit has a current of 2 amperes, and a resistance of 1 ohm, (< these are the two "knowns"), then according to Ohms Law and the formulas above, voltage equals current multiplied by resistance:. E = Voltage (Volt) I = Current (Amp) P = Power (Watt) R = Resistance (Ohm) Instructions. 6,528 results for 4 ohm speakers Save 4 ohm speakers to get email alerts and updates on your eBay Feed. Most consumer speakers are designed to operate at 8 ohms, however there are manufacturers that will drop that to 6, or 4 ohms, or increase it to as high as 16 ohms. More information can be found on the dedicated page about rheostats. Now calculate the length of one turn of wire on the coil. The ohm (symbol: Ω) is the SI unit of electrical impedance or, in the direct current case, electrical resistance, named after Georg Ohm. P = V * I, where P is power in Watts, V is voltage in Volts and I is current in Amps. An 8 ohm speaker requires more amperage to run than a 4 ohm speaker. A 4ohm speaker draws more electric current through your AV receiver's output transistors, and since more current equals greater power, 4ohm speakers tend to have greater dynamic range and play louder more easily than 8ohm speakers. Also, we need to understand that, a amplifier with 5 Watt, 6 Watt or 10 Watt or even more is the RMS (Root Mean Square) wattage, delivered by the amplifier to a specific load in continuous operation. Only 1 left in stock  order soon. 2 ohms and 16VDC would produce around 700 Watts RMS at 0. In a typical three way speaker, the woofer, which usually handles most of the power, will be rated at hundreds of watts, but the tweeter will only be rated at 20 to 50 watts. The 8ohms speaker will be asked to dissipate about 16 watts, while the 4ohm speaker will need to dissipate only 33 watts or so. Watts, Amps, Volts, Ohms About sixty people a day visit this metric web site asking for a conversion from watts to volts or an amp to volt conversion. A watt is a unit of power. It is usually stated as: E = IR, or V=IR, where E or V = voltage, in volts. For relatively short runs (less than 50 feet) to 8 ohm speakers, 16 gauge wire will usually do just fine. 100 watts @ 4 ohms into a 4 ohm load = 100 watts. The amp will put the same voltage to speakers unless it is regulated, those amps show the same watts to different loads (speaker ohms). Overpowering a speaker by supplying more watts than it needs can lead to damage to your equipment. Add up the total ohms for all speaker pairs, which in this example would be 4+4 (8) and 8+8 (16). 075 kilohms and. Calculates power / voltage / current / resistance. Resistors are used to control voltage and current levels. So, let's start with voltage and go from there. Some manufacturers inflate specifications by measuring power at a single frequency, say 1 kHz, rather than an entire frequency range, such as 20 Hz to 20 kHz. A very high resistance allows a small amount of current to flow. 0 Volt, 100 k ohms, for rated output at the maximum level control HUM AND NOISE: 94dB below rated output POWER LEVEL METER: Meter is calibrated to read OdB when amplifier produces 100 watts into 8 ohms load. I'd normally tell you not to play too loud, and pay attention to if the receiver is getting hot. In the United States, electricity has a resistance of 120 volts. Vintage set of Pioneer speakers. This will give you a 2 ohm load. Free UPS Ground Shipping in the U. com Ohms Calculator Ad Free Permission Break Down No permissions This ohms law app is designed for calculating volts, amps, ohms and watts from two know variables. Equations used to calculate the data: V = IR P = VI. These RF attenuators are available in 50 Ohm and 75 Ohm impedance variations. amps = watts ÷ volts. Additional combinations and values may be calculated with our Parallel and Series Calculators. WGS "G10A" Guitar Speaker  10inch  75 watts {16 Ohm}[#0003]  eBay. However, amplifiers are rated using sine wave input signals, and (as described above) we need to apply more voltage to a load (for a sine wave) in order to get the same amount of power that would be delivered by a DC. 10 Dual 4ohm Component Subwoofer fiberglassreinforced paper cone with doublestitched rubber surround,castaluminum basket,power handling: 500 watts RMS (1000 watts peak) more. The math would look like this: 8 ohms / 2 speakers = 4 ohms total. Online speaker building calculators by HiFi Speaker Design. Resistance is a property of a material that works in opposition to the free flow of electrons, and is the inverse of the conductance of the material. This means a speaker with a “nominal impedance” of 8 ohms and a program power rating of 350 watts will require an amplifier that can produce 700 watts into an 8ohm load. If you connect the 4 Ohm speakers in series it's 8 Ohms. Click calculate to find the energy consumption of a desktop computer using 100 Watts for 6 hours a day @ $0. For the most part, you can't go wrong with having more power at your disposal than not. The unit of the. 2) A 120 volt, 25 watt refrigerator bulb is using how much current? Since you know the voltage (E) and power (W), click on the "E+W" button, then click on volts and milliamps, then enter the numbers. 2) with 13 speakers on the ceiling which are just 20 watt 8 ohm ones probably connected in seriesparallel but not sure. A single 4 ohm speaker is the equivalent of two 8 ohm speakers in parallel. OK, so now our 8 ohm speaker which had a DCR of 6. If you set the voltage slider below to 20 volts, and the resistance slider to 4, you can see that the power is 100 watts. This is often not known by users. 256w =108db (To get what my speakers will do with a less than 20 watt amp). Thick wire (12 or 14 gauge) is recommended for long wire runs, high power applications, and lowimpedance speakers (4 or 6 ohms). Grill doesn’t come off without unscrewing from the inside. If you use much more power, you are likely to damage the speaker by forcing the speaker cone to its limits. Electrical Term Definitions. I sit back from my speakers at about 9 feet/3metres at the fore said power SPL levels and find it quite. So the vintage speakers combined in series are at 16 ohms and receive 40 watts (20 watts per speaker). On the Crown website is a calculator that determines the amplifier power required to achieve the desired SPL at a certain distance. If we have an 8ohm speaker that produces 90 dB, 1 watt at 1 meter, we can express this as 90 dB, 2. this item 3 x 5" full range replacement speaker button magnet 5 watts 8 ohms JBL Club 6420 4x6" 70W RMS Club Series 2Way Coaxial Car Speakers JVC CSJ620 300W 6. The current I in amps (A) is equal to the voltage V in volts (V), divided by the resistance R in ohms (Ω). For example, the PSB Synchrony TwoB bookshelf speaker, a small twoway bookshelf design using a 5. 100 watt to 4 ohms, it not remotely the same as 100 watts to 8 ohms. *Beware that some speaker manufacturers quote sensitivity as 2. 0162 ohms and voltage drop of 0. A very low resistance allows a large amount of current to flow. 83V compared to 1W for a 8 ohm speaker. A loss of 3 dB would mean that half the amplifier's power is being dissipated by the wire, not the speaker!. Understanding speaker ohms and Watts !! Speaker ohms !! Speaker watts!! MS ( ALL DJ & TECHNICAL SOLUTIONS ) Amps, and Watts Explained  Duration: 7:42. Ohms to Amps calculation with watts. The Difference Between Watts vs. ohms / ft sample speaker calculation 12ga = 0. The ohms rating of the speaker depends on how much electricity it resists, and. yoursoundvideo. Phoenix Gold has created a wide range of car audio and marine audio amplifiers, subwoofers, and speakers to enhance your ride. To calculate the watts, multiply 8. In my case, I connect the left channel output with an 8 ohms 3 watts speaker and the right output with same 8 ohms but 5 watts speaker. new in box Celestion G12 12" 16 ohm 70 watt guitar speaker. 1000 watt amplifier at 4 ohm load will put out 750 watts at 6 ohms, and 500 watts at 8 ohms, not accounting for efficiency, or the fact that typically most amplifiers will not produce quite double the power at half the load, again, depending on the topography of the amp. A potentiometer can also be wired as a rheostat, or single variable resistance. One volt is the amount of pressure required to cause one ampere of current to flow against one ohm of resistance. A speaker with a lower impedance is like a bigger pipe in that it lets more electrical signal through and allows it to flow more easily. The ohms and watts are used to know the quantity of each while handling them. 83V compared to 1W for a 8 ohm speaker. You are misunderstanding what watts and amperes mean, so you need more information. I am needing help to calculate how much RMS watts each speaker will get. The standard for audio was born out of the radio industries need to set a standard, and has always been related to 600 Ohms impedance with the level measured in dBm which refers to Decibel milliWatts of power delivered to the "load". Click here to view image. Asked in Computer Hardware , Electronics. See here for more details. They will be fine with your receiver. It was define by the German scientist Georg Simon Ohm, and hence is named after him. Is that 3000 rms wattage? Asking as that is a ton of power for a single 8" subwoofer. Named for Georg Simon Ohm, the Ohm is a unit of measurement for the resistance in an electrical circuit. For example, two 8ohm speakers in parallel have an impedance of 4 ohms. With our 120 Day. Speaker boxes design. S pecifications:. A speaker's efficiency is measured in decibels (dB), with the reading made at a distance 1 meter away from the front of the speaker while the speaker is being driven at 1 watt. Speakers in Parallel Calculator  Geoff the Grey Geek. To determine the wattage you add the wattage of the speakers together. Add a thump to your sound system by shopping online for Subwoofers at Amazon India. Enter any two parameters to calculate the other two. Ohms is a unit of electrical resistance, the greater. With a 4 ohms loudspeaker you generate 2 watts. ›› Definition: Ohm. Only 1 left in stock  order soon. The amount of current that can be handled is also limited by the design, but this limit could be exceeded if you hook up speakers with too low an impedance. This is true for many materials, over a wide range of voltages and currents, and the resistance and conductance of electronic components made from these materials remains constant. 4 ohm load you would require the square root of 10 x 6. Divide 250 watts by the same 50 ohm antenna resistance and you get 5. For example, we can calculate the power in watts by referencing the yellow area in the circle. The answer is 75 ohms,. Is that 3000 rms wattage? Asking as that is a ton of power for a single 8" subwoofer. To calculate the watts, multiply 8. Many people believe that if their amplifier is 2 ohm stable then they can bridge it to a 2 ohm speaker load. For example, connecting two 8 ohm speakers to our amplifier of 800 watts at 2 ohms, you get an actual wattage of (2 / 16) x 800 = 100 watts. Most of the online amplifier power calculators work in the same way. This means a speaker with a "nominal impedance" of 8 ohms and a program power rating of 350 watts will require an amplifier that can produce 700 watts into an 8ohm load. Calculates power / voltage / current / resistance. The 8 Ohm speaker will get less power than the 4 Ohms and the volume will be lower. WGS "G10A" Guitar Speaker  10inch  75 watts {16 Ohm}[#0003]  eBay. Is it possible to add a newer 4 ohms speaker to this center channel by connecting the two vintage speakers in parallel (now with a combined resistance of 4 ohms) and then connect these to the new speaker (at 4 ohms) in. Supports amps, miliamps, watts, kilowatts, megawatts, volts, millivolts and kilovolts, ohms, kiloohms, and megaohms. Audio output transformers are heavily used in a vacuum tube and some (older) transistor base audio power amplifiers, but these days output transformer are quite hard to find and expensive item. If we have an 8ohm speaker that produces 90 dB, 1 watt at 1 meter, we can express this as 90 dB, 2. Use this Ohm's Law calculator to easily calculate the power, resistance, voltage, or electrical current, based on two known parameters. VAVLE AMP RULE #2: Make sure the Ohm setting on the amp is the same as the speakers (or cabinet). OHM TRS218  293290  PA Speakers  Headphones & Speakers  Studiospares. This equation can be solved as: voltage equals the square root of wattage times resistance. This is not the case as a bridged amplifier will see a 2 ohm speaker load as 1 ohm. created date:. Legend BP1024. Enter 100 in the Watts field and 120 in the Voltage field and press Calculate to find the resistance and current. Most of the 1000 watts of current will be restricted by the additional resistance of 8 ohms and the amplifier would more likely be delivering 250watts to the subwoofers when wired in this fashion. That one output has a power rating at 4 ohms. In that case, each speaker would receive half of the amplifier's 4ohm power. 5 amps from the amp. 83V compared to 1W for a 8 ohm speaker. Standard speaker impedance values are 4Ω and 8Ω. The results show every possible wiring configuration for your setup. 2M (megohm) unit, the resistance is 2,200 000 ohms. This is a superb tone and sound recreation of the 60â€™s G12M 20w Kraft paper voice coil era "Greenback" that was used in Marshall stacks, BluesBreaker combos, and many other British amps of the pre 1973 era such as Vox, Orange, Sound City, etc. Hand crafted in the USA. For a stereo pair of speakers, the amplifier should be rated at 700 watts per channel into 8 ohms. I was left with the impression that the reactance of the speaker was related to the frequency  and the physical characteristics of the enclosure that changes the way a speaker behaves (as compared to openair). 16 AWG: 4 Ohm = 1. depending on the ohms your speakers take up and the wattage the speakers use, tells you what size amp you need. The click on Calculate for the required power calculation. This website calculates the nominal impedance created with different combinations of wiring speakers together. WGS "G10A" Guitar Speaker  10inch  75 watts {16 Ohm}[#0003]  eBay. At this frequency, the speaker can be driven to its mechanical limits with less power than at any other frequency. current = power ÷ voltage. Resistor2 should be rated at 5 watts or more and Resistor3 should be rated at 3 watts or more. 8 ohms or above for an 8 ohm amp. Into an 8 ohm load each output will deliver around 215 Watts, into 4 ohms around 300W. This concept is important even if you are buying an 8 ohm speaker. volts, amps) then you can find out the other (e. With the available 100V this will produce a power of about 90 Watts, reaching the speaker. I'd say you're OK to use the Onkyo with 4 ohm speakers. Speaker wire may be either solid copper wire or stranded copper wire, with stranded wire being the most common. Design: Subwoofer Cabinet, Reflex Tuning * Impedence: 4 Ohm, Minimum 3. A neat analogy to help understand these terms is a system of plumbing pipes. This figure is often a good approximation for what level of volume and clarity your audio device is capable of producing. Able to control any load at or below it's rated value, i. Alternatively, if it is designed for 8 ohm speakers and 100 watts per speaker, it. AVS Forum  Home Theater Discussions And Reviews > Audio > Speakers > Speaker wire calculator for size, ohms, watts & distance,, Thread Tools: Forum Jump:. If you use much more power, you are likely to damage the speaker by forcing the speaker cone to its limits. 0 Volt, 100 k ohms, for rated output at the maximum level control HUM AND NOISE: 94dB below rated output POWER LEVEL METER: Meter is calibrated to read OdB when amplifier produces 100 watts into 8 ohms load. (at 8 ohms load, 20Hz to 20,000Hz) with "SPEAKER DAMPING" switch set to; "MEDIUM" "SOFT" "NORMAL" 50 INPUT SENSITIVITY AND IMPEDANCE: I. For example, a 100 watt light bulb operating on 120 volts AC will have 144 ohms of resistance and will draw 0. VINTAGE PIONEER CS907 Set Of 2 Speakers 400 Watts 8 Ohms 15" Woofer  $400. Speaker wiring is a simple process that often gets complicated when trying to visualize the wiring configuration. Forty volts times 40 volts equals 1600. Power handling  as a rule of thumb, when mixing speakers in a four speaker cabinet. Both contain speakers that are rated at 200watts & 8ohms. One 8ohm speaker plays loudly with only half the current from the amp, but if two 8ohm speakers are connected in parallel, the resistance in each speaker falls to 4 ohms to match the amp. If you were using (2) 8 ohm speakers you'd have a 16 ohm cabinet. Running a resistor in parallel will lower the impedance to that the stereo sees, but the actual power in the speakers won't increase. Unlike speaker amplifiers which are rated using power (watts into 8 ohms), headphone amplifiers are usually rated by how much output VOLTAGE they can deliver, not how much POWER they can deliver. If you have two speakers in series, the higher impedance speaker takes more power. Enter 2 values to get the other values and press the Calculate button:. Vintage set of Pioneer speakers. Two 8 ohm speakers connected to a single output on the mixer will be a 4 ohm load. S pecifications:. The symbol for amps is A. Power Calculator. Ohms law tells us that Ohms are equal to volts divided by amps, while Watts law tells us that Watts are equal to Volts x Amps. The math would look like this: 8 ohms / 2 speakers = 4 ohms total. In that regards you are safe connecting your 300Watts/8Ohm speakers. Most consumer speakers are designed to operate at 8 ohms, however there are manufacturers that will drop that to 6, or 4 ohms, or increase it to as high as 16 ohms. With Ohm’s law we calculate the resistance value of the ballast resistor: The resistor must have a value of at least 183. One milliWatt = 0dBm. Hope this helps. What is Voltage?  YouTube. MPA 152 Plus. Is that 3000 rms wattage? Asking as that is a ton of power for a single 8" subwoofer. Now, lets calculate how much power the microwave will use in one day. Calculate Power, Current, Voltage or Resistance. It will be lower than the rated impedance of the speaker. High performance audio power amplifiers that feature Dante audio networking and integrated DSP. Only 1 left in stock  order soon. Watts are units of power, in the sense of work done in a certain amount of time. The speaker sensitivity, typically expressed in decibels (dB) with 1 watt (or 2. The amp would 'see' about 111 Ohms. DIY Audio & Video Tutorials, FAQs, Calculators and Examples for Speaker Boxes, Crossovers, Filters, Wiring, Home Automation, Security & more. Ohms Law Calculator Enter any two known values and press "Calculate" to solve for the others. For example, an amplifier might be rated at 100 watts per channel to an 8 ohm load and 190 watts to a 4 ohm load. Wiring Configuration for 2 Speakers in Parallel Two 4 ohm speakers = 2 ohm load. Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage. ›› Definition: Watt. For example, we can calculate the power in watts by referencing the yellow area in the circle. This is just a simple fact. Thats how the M100 was originally rated as a 20 watt amp, 10Wx2 RMS @ 4ohms @ 0. In order to calculate your total impedance, you must know the impedance of the speakers or cabinets and how they are connected. Amps, watts, volts and ohms are units of measurement in a similar way that the metre is a unit for distance. The Kenwood Mono Car Amplifier 2000 Watts, Signal Sensing Sensor, Speaker Level Input ,2 Ohms Load Capability, KACPS917D Speaker & Amplifiers is manufactured by Kenwood. For example, to find the Voltage in a circuit: If the circuit has a current of 2 amperes, and a resistance of 1 ohm, (< these are the two "knowns"), then according to Ohms Law and the formulas above, voltage equals current multiplied by resistance:. Any 8ohm rated speakers would work just as well, and since the vast majority of speakers are 8 ohm rated, his choice of speakers is wide open. Hours Used Per Day: Enter how many hours the device is being used on average per day, if the power consumption is lower than 1 hour per day enter as a decimal. This is the circuit diagram of a fully transistorized sub woofer amplifier that can produce an output of 100W. ( P ) Power is the amount of current times the voltage level at a given point measured in wattage or watts. Current is a measurement of how much charge is moving through a particular point in a unit of time. Alternatively, if it is designed for 8 ohm speakers and 100 watts per speaker, it. The Ohm L is the most popular speaker Ohm has ever built. Resistance is measured in ohms. Ohms law calculator or ohm's Volt / Amp / Watt / ohm Calculator ;formulas is free and simple application basic online calculator that will caculate voltage in ( volts )resistance in ( ohm's ) current in ( ampers ) and power in ( watts ) from any 2 given values this tool for any electrical engineer and electronic engineer Easily calculate and Great for every electrician or engineer. Transforms 70 volt signal down to 8 ohms, or high voltage and low current to low voltage and high high current; Attached tthe speaker in most cases. The answer is 75 ohms,. You are misunderstanding what watts and amperes mean, so you need more information. 236 in (8 x 12 x 6 mm) Number of Speakers 1. For speakers in series, you add the impedances of the speakers together. The amp will put the same voltage to speakers unless it is regulated, those amps show the same watts to different loads (speaker ohms). The amp under consideration needs to be (or ought to be) stable into very low impedance loads (< 2 ohms). The calculation for mixing these speakers involves speaker system A (8 ohms) multiplied by speaker system B (16 ohms) = 128 ohms. It's all very well having a 6k platetoplate to 8 ohms tranny when you need 3k pp into 8 ohms. The emx660 has two amp outputs, each capable of driving either 8 or 4 ohms. In regards to estimating what this would do for your power output, we can use Ohms law to calculate this. 00 0 0 0 8 10 5 4 0 page 1. Speakers do not run at an exact ohm rating. Notice that the ratio of the primary impedance to the secondary impedance is the square of the turns ratio, or 100:1. Speaker components inside the box shows strong connections showing no signs of corrosion. 83 volts across an 8 ohm speaker) measured onaxis one meter away. I also have a FirstWatt SIT2 and a nice 18watt 300B SET amp. This seems to work fine. 83 Volt this would be 1/4 of a Watt. this item 3 x 5" full range replacement speaker button magnet 5 watts 8 ohms JBL Club 6420 4x6" 70W RMS Club Series 2Way Coaxial Car Speakers JVC CSJ620 300W 6. At this frequency, the speaker can be driven to its mechanical limits with less power than at any other frequency. An 8 ohm speaker and an 8 ohm speaker wired in series would result in 16 ohms of resistance to current flow. The answer is 75 ohms,. Shall provide a frequency range of 70 Hz to 20 kHz, 10 dB. Convert Voltage/Hertz to Watts? by Andy Wigner on 06/04/05 at 23:01:54 I'm testing out a new generator and need to know Rated (Running) Watts for different appliance loads. Get details of Sweton 40 Watt Speaker, 40 watt Woofer, 8 inch Speaker, 4 ohm including specifications, features and more on Amazon. Inverting the equation we get. E = Voltage (Volt) I = Current (Amp) P = Power (Watt) R = Resistance (Ohm) Instructions. More information can be found on the dedicated page about rheostats. Designed for passive speaker crossovers at an economy price. Any speaker impedance rating that is 4ohms is typically going to be a highend, audiophile product that wants an amplifier that can really put out some power. Where: I = current P = power R = resistance V = voltage. 5 ohms, intended for use on 5V mods: 7 watts and 1. Mostly it is the voltage of constant 2. Enter the Impedance and required attenuation level to get values for R1 and R2. Select an amplifier (s) rated for the appropriate RMS power at whichever impedance you plan to wire your subwoofers. Speaker wire may be either solid copper wire or stranded copper wire, with stranded wire being the most common. The 8 Ohm speaker will get less power than the 4 Ohms and the volume will be lower. 1 watt = 1 voltamp = 1 amp 2 ohm = 1 volt 2 / ohm. Capacity: 16 Ohms, 75 watts. Impedance Calculator. created date:. Use this Ohm's Law calculator to easily calculate the power, resistance, voltage, or electrical current, based on two known parameters. current = 1200W ÷ 120V. What is Voltage?  YouTube. Calculate the desired AC voltage output for the amplifier. The amount of current that can be handled is also limited by the design, but this limit could be exceeded if you hook up speakers with too low an impedance. If I’m using a variable wattage or power device, it’s usually set around 8 watts. ENERGY STAR qualified audio power amplifiers delivering 35 watts to 100 watts per channel into low or high impedance systems. The reflected impedance is a function of the turns ratio of the transformer. Like how watts and ohms are determined by how many speakers you have inline. The formula is: Power Required = (Quantity Of Speakers x Watts) + 20%. The RMS Voltage calculator calculates the RMS Voltage value from either the peak voltage, the peaktopeak voltage, or the average voltage. If we measure the DCR of the speaker, we now find that this voice coil is now 12 ohms. Enter the Impedance and required attenuation level to get values for R1 and R2. I'd say you're OK to use the Onkyo with 4 ohm speakers. The amp will put the same voltage to speakers unless it is regulated, those amps show the same watts to different loads (speaker ohms). Amplifier power as measured in Watts (W). DC Electric Power. Ohm ratings on speakers sometimes vary, and if you daisychain speakers; with that in mind, this method has never let me down, and it's pretty simple to apply. With 42 V supply, the output will be around 20 watts and 40. 25", Midrange, Red Steel Basket, 300W Max, 150W RMS, 8 Ohms  Premium Quality Audio Door Speakers for Car or Truck. If you were using (2) 200 watt speakers you'd have 400 watts of power handling. The speaker sensitivity, typically expressed in decibels (dB) with 1 watt (or 2. So a 4 ohm speaker combined with an 8 ohm speaker would have the same total impedance as three 8 ohm speakers in parallel. It will continously vary with frequency and load. On the Crown website is a calculator that determines the amplifier power required to achieve the desired SPL at a certain distance. This is true for many materials, over a wide range of voltages and currents, and the resistance and conductance of electronic components made from these materials remains constant. If you connect these two speakers parallel to the 8 Ohms speaker, you will have 4 Ohms in total. ohms / ft sample speaker calculation 12ga = 0. For example, a 100 watt light bulb operating on 120 volts AC will have 144 ohms of resistance and will draw 0. 05% at 1W, 1 kHz. The specifications do not list a "range" of speaker impedances, on page 9 you find a small warning "not to connect any speaker with an impedance lower than 6 Ohms". With a 4 ohm speaker, the maximum output power will be 350 watts. FREE DELIVERY, EMI, COD possible on eligible purchases. A watt is a unit of power. The following diagrams are the most popular wiring configurations. Most of the 1000 watts of current will be restricted by the additional resistance of 8 ohms and the amplifier would more likely be delivering 250watts to the subwoofers when wired in this fashion. The relationship defined by Ohm's Law is: I = V / R. Like how watts and ohms are determined by how many speakers you have inline. yoursoundvideo. Check the label for a nominal impedance rating. E = Voltage (Volt) I = Current (Amp) P = Power (Watt) R = Resistance (Ohm) Instructions. For example, if I have two 8 ohm speakers wired in parallel, I would take 8 ohms and divide that by the number of speakers I have, which again are two. Most of the online amplifier power calculators work in the same way. SBS4DCC "Sugar Cube" Speaker 8x12mm 8 ohm. 8 ohms or above for an 8 ohm amp. 8 ohm resistor be used to restrict the voltage to ~2. (For example: 30 minutes per day is 0. The speakers are big, use 3 8 inch woofers and have incredibly smooth highs. The current in amps and the voltage of the source multiplied is equal to the power draw in watts. Sixteen hundred divided by 16 ohms equals 100 watts. Ohms law tells us that Ohms are equal to volts divided by amps, while Watts law tells us that Watts are equal to Volts x Amps. 100 watts @ 4 ohms into a 1 ohm load = appx. The unit of the. com The calculator can be used for 2, 3 or 4 speakers wired in parallel. They show a typical single channel wiring scheme. The issue is you have to check the amp ratingif it's 1600 watts at 2 Ohms, then it would be the equivalent of 800 watts at 4 Ohms; you also want a little bit of overhead, as in the power amp should have at least the equivalent wattage or higher (higher is always better from the power amp side); you never want to underpower a speakerthat will always lead to failure issues when the speaker. Some manufacturers inflate specifications by measuring power at a single frequency, say 1 kHz, rather than an entire frequency range, such as 20 Hz to 20 kHz.  4 or 8 Ohms), the actual impedance curve may vary with frequency (speakers have inductance). This equals 996 watts. The power P in watts (W) is equal to the voltage V in volts (V) times the current I in amps (A):. A speaker with 4 ohm nominal impedance uses 2W at 2. We usually use an 8 ohm, 8 inch coaxial speaker. 33 dB, 16 Ohm =. For example, for an 8 ohm and 4 ohm speaker in series, the power shared is proportional to the resistance, so the 8 ohm speaker absorbs twice the power of the 4 ohm speaker. The speakers are big, use 3 8 inch woofers and have incredibly smooth highs. Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage. Jensen Loudspeakers Ceramic Vintage 12''/ 16 ohm. This is a good calculator that tells you how many watts you need for a given speaker sensitivity at a given volume at a given distance. RF dB attenuation values for these Pasternack attenuators range from 0 dB to 110 dB. FREE DELIVERY, EMI, COD possible on eligible purchases. Balanced Attenuator Calculator. 2 ohms, intended for 7. The math would look like this: 8 ohms / 2 speakers = 4 ohms total. 2 X 16 Ohm Speaker = 32 Ohm Load Or, in Parallel: 2 X 4 Ohm Speaker = 2 Ohm Load; 2 X 8 Ohm Speaker = 4 Ohm Load; 2 X 16 Ohm Speaker = 8 Ohm Load Four Speakers Remember: 1. Some manufacturers inflate specifications by measuring power at a single frequency, say 1 kHz, rather than an entire frequency range, such as 20 Hz to 20 kHz. With Ohm’s law we calculate the resistance value of the ballast resistor: The resistor must have a value of at least 183. Crossover frequencies of 800 Hz and 5,000 Hz with 12 dB per octave rolloff into an 8 ohm load. 4ohm Speakers Should Typically Be Mated with Higher Power Amplifiers. Speaker boxes design. For a 12ga copper wire 10 feet long with a load of 5 amps, the calculator above indicates a resistance of 0. This is just a simple fact. Remember Ohm’s Law Watts = Volts x Amps Amps = Watts/Volts So, if you have two of the numbers (e. Techquickie 1,708,598 views. Ohm's Law states the relationship between current, voltage and resistance. Welcome to Speaker Impedance. More information can be found on the dedicated page about rheostats. This model delivers 135watts rms per channel in class A/B operation, into 8 ohms speakers, and 250 watts per channel into 4 ohms. The cable adds a resistance of 10. The square root of that is 4. The Difference Between Watts vs. For a limited time, all speakers ship for $25 within the contiguous 48 states. Ohm speakers provide the most firm, precise stereo imaging over the widest SweetSweep from any speakers worldwide. Hours Used Per Day: Enter how many hours the device is being used on average per day, if the power consumption is lower than 1 hour per day enter as a decimal. This is why watts are sometimes called voltamps. Clearly, the #24 wire resistance is 3. AudioTechnica Memphis Audio 15M610D4 10" Dual 4ohm Component Subwoofer. This isn’t a “snobby” thing. current = 1200W ÷ 120V. 5 amps So when this amp is producing maximum power (25 watts) into a 4 ohm load, the load will draw 2. 8 volts RMS would have peak voltages of +/ 1. With a 4 ohm speaker, the maximum output power will be 350 watts. This value varies, each amplifier has its own value; such a load can be a low as 1ohm (for instance). This speaker is for: Those who want to more bass punch, and upper mids than the M55PVC speaker, but not as much treble as the H75PVC model. Understanding speaker ohms and Watts !! Speaker ohms !! Speaker watts!! MS ( ALL DJ & TECHNICAL SOLUTIONS ) Amps, and Watts Explained  Duration: 7:42. The amps are voltage pumps and the speakers are what allow amperage to flow depending on their impedance (lower ohms means more amperage means more watts (watts = volts x amps)). E = Voltage (Volt) I = Current (Amp) P = Power (Watt) R = Resistance (Ohm) Instructions. I used the calculator above for series/parallel and I place the mid ohm value "4 ohm" in speaker box one, the sub ohm value "4ohm" in speaker box 3, and the tweeter value "8ohm" in box …. This isn't a "snobby" thing. Amps, watts, volts and ohms are units of measurement in a similar way that the metre is a unit for distance. The standard for audio was born out of the radio industries need to set a standard, and has always been related to 600 Ohms impedance with the level measured in dBm which refers to Decibel milliWatts of power delivered to the "load". Every amplifier has a minimum load impedance. Given the relationship between these three elements, once you know any two of them, it is possible to calculate the third. The resistance of 50 feet of 24 AWG wire calculates to be 1. VAVLE AMP RULE #2: Make sure the Ohm setting on the amp is the same as the speakers (or cabinet). Depending on how speakers are connected to their amplifiers, you can physically drop the Ohms with a few wiring tricks. Any 8ohm rated speakers would work just as well, and since the vast majority of speakers are 8 ohm rated, his choice of speakers is wide open. VINTAGE PIONEER CS907 Set Of 2 Speakers 400 Watts 8 Ohms 15" Woofer  $400. So whether you speakers are 4 ohm or 8 ohms, they are limited by the fixed voltage of the power stage. This small 7W Mono Audio Amplifier Kit is constructed around the TDA2003 power audio IC and delivers 7 watts of music power into a 4 ohms load. Wiring Configuration for 2 Speakers in Parallel Two 4 ohm speakers = 2 ohm load. Speaker Wiring Info. 30 Watts Audio amplifier Circuit Description. I also have a FirstWatt SIT2 and a nice 18watt 300B SET amp. Legend BP1024. Ohm's Law defines the relationship between amps, watts and resistance. Amplifier power as measured in Watts (W). “ Knight KN2222 3 Way Speaker System 15 Watts 8 Ohms Tested Fair Condition. 0162) and voltage drop would be about 0. For 2 Ohm speaker the output will be around 35 watts (R13 and R14 will be 0. 5 ratio is the method I've always used. This series resistor calculator calculates the total resistance, based on the formula above. 2 ohms, intended for 7. This is the maximum amperage that circuit can take. The speaker sensitivity, typically expressed in decibels (dB) with 1 watt (or 2. Amplifiers are limited in the electrical energy they can output, while loudspeakers are limited in the. S pecifications:. The maximum should be 50 watts or higher. Current is a measurement of how much charge is moving through a particular point in a unit of time. 3) I don't see a voltage rating for any of the speakers I've looked at, but I suspect if I use ohm's law I can calculate that based on the peak or RMS wattage and the speaker's ohm rating. Chris Deziel holds a Bachelor's degree in physics and a. You need to know the ohms of all of your speakers if you want to calculate the load your amp is taking and to compensate. Georg Ohm was a Bavarian scientist who studied electricity. You may change either of our default entries. 0 Ohm coil around 5 Volts; You may need more as you go down in ohms or up in # of coils. 10 Dual 4ohm Component Subwoofer fiberglassreinforced paper cone with doublestitched rubber surround,castaluminum basket,power handling: 500 watts RMS (1000 watts peak) more. True tube amplifiers have a large output transformer to match the tubes' output to speaker level impedance, and there are tap(s) off the transformer's secondary to match specific. But generally the speaker impedance is already fixed. For a 12ga copper wire 10 feet long with a load of 5 amps, the calculator above indicates a resistance of 0. 83 V) that would give 1 Watt if the speaker was exactly 8&Omega Ohm. The acceptable upper limit of wire resistance when used with an 8ohm speaker is 5% or 0. This is just a simple fact. Unlike any other alnico speakers, this one can go from clean to dualrec distortion without flubbing out. They show a typical single channel wiring scheme. Many people believe that if their amplifier is 2 ohm stable then they can bridge it to a 2 ohm speaker load. If you went down to 2 ohms, that same amp might send 600 Watts to the load. The less energy, the more you get out of your amps. For example, find the amperage of 1200 watts at 120 volts. 6 ohms), the sound levels will be lower, as the power (wattage) to the speakers will be lower due to the higher impedance of the speakers. 5 dB of loss. Most of the online amplifier power calculators work in the same way. Every amplifier has a minimum load impedance. Price: $170. Hours Used Per Day: Enter how many hours the device is being used on average per day, if the power consumption is lower than 1 hour per day enter as a decimal. To use the TDA2030 with the two speakers they would have to be connected in series so you would be driving a 6. Watts (W)  volts (V)  amps (A)  ohms (Ω) calculator. Electrical Term Definitions. You can start by selecting the type of electric current. the various speakers in a system. yoursoundvideo. Wattsvoltsampsohms calculator It is a conversion calculator that is used to compute the voltage, power, current and resistance. How to Calculate with Watts, Amps, Volts, and Ohms If you want to do an electrical calculation involving voltage, current, resistance, or power, reference the formulae circle below. To handle heavy metal/grunge, the amplifier's 4 Ohm power should be 2. ElectroVoice is part of the Bosch Communications Systems family of brands, offering the world’s most complete portfolio of professional audio and communications solutions. Watts are units of power, in the sense of work done in a certain amount of time. None of the receivers will do that. The acceptable upper limit of wire resistance when used with an 8ohm speaker is 5% or 0. Notice that the ratio of the primary impedance to the secondary impedance is the square of the turns ratio, or 100:1. If you were using (2) 200 watt speakers you'd have 400 watts of power handling. With McIntosh the bass is rather loose. Now calculate the length of one turn of wire on the coil. In the United States, electricity has a resistance of 120 volts. Resonance: Freeair resonance is the frequency at which the speaker oscillates most readily. FREDO 10" Subwoofer 8 Ohm RMS100 Watts, PMPO 3600Watts. Most of the online amplifier power calculators work in the same way. 100 watt to 4 ohms, it not remotely the same as 100 watts to 8 ohms. 5" Loud speaker 4 ohm 80 watt peak Full Range Speaker NS352554A. The 65w speakers do not spark or catch on fire. The current I in amps (A) is equal to the voltage V in volts (V), divided by the resistance R in ohms (Ω). Circuit breakers usually have the amps written on their handles. Design: Subwoofer Cabinet, Reflex Tuning * Impedence: 4 Ohm, Minimum 3. Volts are a measure of potential difference with respect to something else. Speaker Wiring Info. The calculation for mixing these speakers involves speaker system A (8 ohms) multiplied by speaker system B (16 ohms) = 128 ohms. Asked in Computer Hardware , Electronics. Designed for passive speaker crossovers at an economy price. Hope this helps. This is a good calculator that tells you how many watts you need for a given speaker sensitivity at a given volume at a given distance. The square root of that is 2. *Beware that some speaker manufacturers quote sensitivity as 2. Speaker A and B are each rated at 25 watts. As you can see, an 18gauge cable with a 4Ohm speaker at 100 feet results in 2. For example, a 100 watt light bulb operating on 120 volts AC will have 144 ohms of resistance and will draw 0. This is a good calculator that tells you how many watts you need for a given speaker sensitivity at a given volume at a given distance. The amp will run on 200W. For most people, 50 watts will be more than enough, and Denon's least expensive receiver, the AVR1513, is rated at 110 watts per channel. (For example: 30 minutes per day is 0. Make sure they can handle it. This gives each speaker an 4 ohm impedance. 4 = the square root of 64 = 8 volts rms. If you were using (2) 8 ohm speakers you'd have a 16 ohm cabinet. You have two 16 Ohm speakers to attach to a channel, putting them in series would give you 32 Ohms, low volume and likely poor sound quality, putting them in parallel would give you 8 Ohms, normal volume and normal sound quality. Finally, click the "Calculate It" button to see the frequency this filter will be 3 dB. To calculate the RMS power in units of watts. Ohm's Law states the relationship between current, voltage and resistance. Most solid state amps are perfectly fine with speakers of any ohms. The unit of the. However, Dynamic Power could push 100 watts into 8 ohms and 150 watts into 4 ohms. 9 Volts; A 2. 44 dB 18 AWG: 4 Ohm = 2. This usually occurs at a frequency between 250 and 400 Hz. Ok, I need some help because I am baffled on this. The ohms rating of the speaker depends on how much electricity it resists, and. To calculate impedance for SeriesParallel wiring, enter the impedance of each voice coil, the number of subs you are wiring, and then hit calculate. Size (mm  with Sound Chamber) 0. The Ohm L is the most popular speaker Ohm has ever built. 178K subscribers. Forty volts times 40 volts equals 1600. Check the amplifier's owners manual for minimum impedance the amplifier will handle before hooking up the speakers. Shop with confidence. So a 4 ohm speaker combined with an 8 ohm speaker would have the same total impedance as three 8 ohm speakers in parallel. 6,528 results for 4 ohm speakers Save 4 ohm speakers to get email alerts and updates on your eBay Feed. Well, the 200 watt 4 Ohm speaker needs more current than the 8 Ohms at the same power of 200 watts. Typical values are 8589 dB for bookshelf speakers, 87 to 92 dB for floor standing models, with high efficiency speakers in the 93 to 100+ dB range. With the available 100V this will produce a power of about 90 Watts, reaching the speaker. As you can see, an 18gauge cable with a 4Ohm speaker at 100 feet results in 2. The formula for calculating the output voltage is based on Ohms Law and is shown below. You'd really need two 16 ohm speakers wired in parallel for 8 ohms, or two 4 ohm speakers wired in series for 8 ohms. What is Voltage? If playback doesn't begin shortly, try restarting your device. It was designed to have the deep bass of the popular Advent Loudspeaker in a much smaller cabinet by using… RonP September 5, 2019, 12:07am #16. To use it, enter the quantity of speakers, the the wattage (power) tap used. With a 4 ohms loudspeaker you generate 2 watts. Equations used to calculate the data: V = IR P = VI. Be sure you are comparing amp and speaker ratings for the same impedance value. I used the calculator above for series/parallel and I place the mid ohm value “4 ohm” in speaker box one, the sub ohm value “4ohm” in speaker box 3, and the tweeter value “8ohm” in box …. It's difficult to use speakers with different impedances in the same cabinet. The impedance of the speaker used in the demonstration is 8ohms nominal impedance. This gives each speaker an 4 ohm impedance. "An [sic] Gold Standard for an amplifier would be to double the power at 4 ohms. For example: a device that draws 2 amps from a 12 volts source is consuming 24 watts while a device that draws 2 amps from a 24 volts source is consuming 48 watts. If the amplifier is rated at 80 watts at 8 ohms, it should (ideally) produce 160 watts at 4 ohms (or close to it). Wiring subwoofers to the wrong, or unmatched, amplifier impedance is a VERY common cause of blowing amplifiers and burning voice coils in subwoofers. Let me be really clear on this With MOST tube amps the amp can handle a 100% mismatch w/o too many (often times no) issuesmeaning if the amp wants to see 8 ohms the speaker or cab could be 4 ohms or 16 ohms but no more than 100%, meaning if the amp wants to see 8 ohms don't even think about trying to run 2 ohms or 32 ohms!. The word "power amplifier" is a misnomer  especially in audio engineering. 99 Watts (40 x 40 =1600 1600 / 23. 2 ohms and 16VDC would produce around 700 Watts RMS at 0. Quite correct. Overpowering a speaker by supplying more watts than it needs can lead to damage to your equipment. So if I wire the mid and the sub in series that would be 8 ohms, and then the tweeter in parallel that would bring me to 4 ohms. For example, if your system impedance is 8 ohms made up of a pair of 4ohm speakers, consider taking out your 4ohm speakers and implementing 1 4 ohm speaker. For most people, 50 watts will be more than enough, and Denon's least expensive receiver, the AVR1513, is rated at 110 watts per channel. Supports amps, miliamps, watts, kilowatts, megawatts, volts, millivolts and kilovolts, ohms, kiloohms, and megaohms. Wattsvoltsampsohms calculator It is a conversion calculator that is used to compute the voltage, power, current and resistance. Any 8ohm rated speakers would work just as well, and since the vast majority of speakers are 8 ohm rated, his choice of speakers is wide open. These online calculators use Ohm's Law to calculate voltage, current, resistance, or watts. 
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