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#400996 - 02/13/14 09:36 AM Power Requirements for EP500 V3
papester Offline
newbie

Registered: 02/13/14
Posts: 1
Can someone provide the Power requirements for the EP500 V3. I'm interested in the Amperage recommendations for the unit.

Thanks,

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#400998 - 02/13/14 10:14 AM Re: Power Requirements for EP500 V3 [Re: papester]
brwsaw Offline
connoisseur

Registered: 10/12/12
Posts: 1034
The EP500 has a built in amp.
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Doh!

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#401000 - 02/13/14 10:44 AM Re: Power Requirements for EP500 V3 [Re: papester]
MarkSJohnson Online   happy
shareholder in the making

Registered: 09/27/04
Posts: 10886
Loc: Central NH
Welcome papester!
The manual is available here but since the manual doesn't list it, I would call Axiom to find out.
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::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#401003 - 02/13/14 01:20 PM Re: Power Requirements for EP500 V3 [Re: papester]
brwsaw Offline
connoisseur

Registered: 10/12/12
Posts: 1034
Guess I should learn to read...Sorry.
Ass u me...lol
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Doh!

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#401004 - 02/13/14 01:26 PM Re: Power Requirements for EP500 V3 [Re: papester]
Socketman Offline
connoisseur

Registered: 07/12/09
Posts: 1189
Loc: Whitehorse YT
I suspect you are wondering how much power it would draw. If that's the case then a 15A outlet should be more than sufficient depending on how many other things are plugged in. My suggestion is to get a device like the killawatt or similar and measure how much you are pulling from the outlet. They are a handy device to have. You will be amazed how little power is actually drawn by your amps etc. If you look on the net you will find sites that will do the maths for you or JohnK will smile
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#401010 - 02/13/14 06:00 PM Re: Power Requirements for EP500 V3 [Re: papester]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13333
Loc: Iowa
I have a 20amp circuit for my entire theater room with no issues supporting an EP600, 2 EP350's, not to mention my amp and other equipment. Why do you ask?
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#401019 - 02/13/14 10:29 PM Re: Power Requirements for EP500 V3 [Re: papester]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10389
Pape, welcome to Axiom. Assuming that what you're asking about is the current flow required by the EP500 during its operation, the relevant form of Ohm's Law is current equals [square root]power/impedance. Using the maximum continuous power capability of the EP500 amplifier in the specs of 500 watts, the square root of 500/4 is 11.2 amperes. Note however that 500 watts will rarely if ever be actually used. At a more typical maximum power usage of 100 watts the number is 5 amperes, and at less than maximum output using a few watts about 1 ampere of current flow is taking place.

These are what might seem to some to be relatively small numbers if they've been impressed by ridiculous "high current" claims of some amplifiers(e.g., 50 or more amperes), but current requirements are controlled by Ohm's Law, not manufacturer hype. So, there would be no specific "amperage recommendations" and typical home electrical wiring is more than capable of meeting any possible requirements.
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#401065 - 02/14/14 10:18 PM Re: Power Requirements for EP500 V3 [Re: JohnK]
Hellcommute Offline
veteran

Registered: 09/23/12
Posts: 148
Originally Posted By: JohnK
Pape, welcome to Axiom. Assuming that what you're asking about is the current flow required by the EP500 during its operation, the relevant form of Ohm's Law is current equals [square root]power/impedance. Using the maximum continuous power capability of the EP500 amplifier in the specs of 500 watts, the square root of 500/4 is 11.2 amperes. Note however that 500 watts will rarely if ever be actually used. At a more typical maximum power usage of 100 watts the number is 5 amperes, and at less than maximum output using a few watts about 1 ampere of current flow is taking place.

These are what might seem to some to be relatively small numbers if they've been impressed by ridiculous "high current" claims of some amplifiers(e.g., 50 or more amperes), but current requirements are controlled by Ohm's Law, not manufacturer hype. So, there would be no specific "amperage recommendations" and typical home electrical wiring is more than capable of meeting any possible requirements.


Close. Your formula is derived from P=I^2R which is tecnically not pertinent to this situation. This formula is used to calculate power dissapation in a purely resistve cicuit where the voltage and current are in phase. Losses.

For peak wall current, without the circuit power factor, the best we can do is P= E x I. Where I = P/E. We can assume the voltage is ~120v (canada), so 500w/120v = 4.167A

But this is also incorrect, as 500w is the RMS output of the amp under very specific conditions, such as input signal level and gain settings. The actual AC draw of the amplifier must be a combination of the in phase (watts) and out of phase components (Vars) of the power supply circuit.

The power supply section is what is being referenced by current input here. Keepng the DC cap filter full after rectification, plus transformer losses, plus circuit component losses, is what the branch circuit sees as AC current draw. The DC current rushing in to fill the empty reserve cap and filter the voltage across the bridge rectifier can be SUBstantial. At startup and prolonged peaks the cap needs to be recharged and draws on the circuit to reach peak voltage again.

The output ampere rating quoted by manufacturers is at certain frequencies under max gain and signal input in the output circuit. The output transistors are saturated. These are theoretical numbers for actual calculations, as under normal music or soundtrack situations they likely would not be present. What the large numbers can tell us is how well sized the power supply circuit is matched to the output section of the amplifier, or if there is active current limiting designed into the circuit. This is also why the "doubling down" of amplifiers is a relevant figure. Floyd Toole uses the "power cube measurement" which follows the same logic.

Unless you listen to sine waves or tones from a frequency generator, a calculator wont give you the answer. An ammeter with peak current readout will.

What a nerd, eh? laugh

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#401068 - 02/15/14 04:11 AM Re: Power Requirements for EP500 V3 [Re: papester]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10389
Audio amplifiers, including internal sub amplifiers, don't operate at the 120 volts measured at the wall outlet. The transformer in the power supply section steps that voltage down to perhaps 40 volts. Using 120, either resulting in 500/120 for about 4 amperes, or in another iteration of Ohm's Law(E/R)120/4 for 30 amperes, doesn't give relevant results.

The somewhat simplistic calculations above using square root(power/impedance)are adequate to give the poster information as to the currents in effect at various power levels.
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Enjoy the music, not the equipment.



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#401070 - 02/15/14 06:53 AM Re: Power Requirements for EP500 V3 [Re: papester]
MarkSJohnson Online   happy
shareholder in the making

Registered: 09/27/04
Posts: 10886
Loc: Central NH
Nerd Fight! Nerd Fight!

This one's SERIOUS! They're taking off the pocket protectors!
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::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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