Amp power output |
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bin juice24
Registered User Joined: 07 February 2020 Location: Here Status: Offline Points: 209 |
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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?
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1085 |
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Yes, that is correct.
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bin juice24
Registered User Joined: 07 February 2020 Location: Here Status: Offline Points: 209 |
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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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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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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 |
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2515 |
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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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