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Amp power output

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bin juice24 View Drop Down
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    Posted: 04 April 2020 at 10:07am
Hi, regarding power output from amp, if I have 2 8ohm speakers per side, wired in parallel, this makes it 4 ohm. If I then power them with an amp rated at 3kw at 4 ohm each channel, does this give each speaker 1.5kw? Albeit at the top end of the spec which I appreciate is optimistic. But is the maths correct?

Thanks 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2020 at 10:13am
Yes, that is correct.
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bin juice24 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bin juice24 Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2020 at 10:54am
Marvellous. Thanks.
6kw is quite a bit to draw off the mains. 6000/240 gives 25a? Are they actually using that? if I were to run two of these amps, would it be prudent to use different circuits? Or go directly into fuse box with chunky cable? Are all you guys running off 3 phase then?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2020 at 11:05am
3 phase has nothing to do with current draw. It’s merely an efficient way to generate and deliver power in larger distribution systems. 

An amplifier with a maximum total output of 6Kw loaded to its minimum load and driven to the point where the MUSICAL peaks are just touching the clip points of the amplifier will draw an average of around 2Kw, so fine from a 13A socket.


Edited by csg - 04 April 2020 at 11:05am
“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2020 at 4:21pm
Originally posted by bin juice24 bin juice24 wrote:

Marvellous. Thanks.
6kw is quite a bit to draw off the mains. 6000/240 gives 25a? Are they actually using that?

Amp output power does not equal input power there will always be some losses.
But music isn't a continuous sinewave it has an average level of 1/3 to 1/8 or more below peak.
Amplifiers also have a certain amount of peak energy storage capacity, old school big iron amps could store a fair bit, modern class D store very little.

All this means the continuous average power drawn from the AC supply will be quite a bit below what the math suggests but depending upon the amplifier design the peak demand could be quite a bit higher. When on shore power you don't have to worry about peak demand though just the continuous average.. the electrical grid has massive peak supply capacity, but on a portable generator you do need to cover at least some of the peak demand.
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