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Old 19th January 2009, 11:58 PM   #1
fb is offline fb  Australia
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Default Maximum amplifiers possible on household circuit

I'm planning a small household/portable PA system and I'm wondering just how much juice I can put into it without frying a standard household circuit.

In particular I'm looking at the amps + smps from red rocks audio.

Say:
2x 750W for mains
1x 1200W for sub
= ~2700W

How much can household circuits take? The powerboards for sale around here say 10A 2400W....




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Old 20th January 2009, 12:03 AM   #2
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30 Small, 2700W????????

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Old 20th January 2009, 12:06 AM   #3
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Hehe, the small is in reference to the PA part..... I've been to events advertised as having 50k soundsystems - small is enough for me
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Old 20th January 2009, 12:10 AM   #4
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In my house I have 3 Phase, each phase have fuse 25A.

That is SMALL?!

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Old 20th January 2009, 12:38 AM   #5
HK26147 is offline HK26147  United States
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Quote:
how much juice I can put into it without frying a standard household circuit.
The fuse/breaker system is designed to prevent that.

Isn't the Au system 240V 50Hz AC. with residential breaker limiting to 10A?
If that's the case the breaker will trip @ 2400 watts ( approx ).
I run a Crown Macro 2400 on a circuit of that capacity.
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Old 20th January 2009, 12:39 AM   #6
Eva is offline Eva  Spain
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Average power drawn with full volume music is likely to be around 10% of rated power at best, so no problem.
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Old 20th January 2009, 01:42 AM   #7
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Remember to divide the total maximum peak output with at least 8 and probably 16 because the average level in music is usually recorded at -12db (though some recording companies don't follow this recording standard but I have yet to see any recording with worse than -9db average).

So a standard European household could sustain 240x16x10=38400 watt per phase, so if you have a 3 phase household 115K watt soundsystem is feasible.

Just remember not to turn all amps on at the same time.
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Old 20th January 2009, 03:37 AM   #8
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Quote:
Originally posted by Saturnus
Just remember not to turn all amps on at the same time.
That's 4 sure!
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Old 20th January 2009, 08:24 AM   #9
winny is offline winny  Sweden
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Originally posted by Saturnus
So a standard European household could sustain 240x16x10=38400 watt per phase, so if you have a 3 phase household 115K watt soundsystem is feasible.
Yes, but there are a couple of problems that comes into consideration here. Given 100 % efficiency, any amplifier without PFC would mean a reduction by about 40 % of that power and even if your average music has a ~12 dB crest factor, if you would play Chemical Brothers - Under the influence on repeat, you would be screwed anyway :-)
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Old 20th January 2009, 08:41 AM   #10
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If you play Chemical Brothers at full volume with 115k watts you would need to be about 20km away

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