Maximum amplifiers possible on household circuit

fb · 19th January 2009, 11:58 PM

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....

Thankyou

zeonrider · 20th January 2009, 12:03 AM

30 Small, 2700W????????

Regards zeoN_Rider

fb · 20th January 2009, 12:06 AM

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

zeonrider · 20th January 2009, 12:10 AM

In my house I have 3 Phase, each phase have fuse 25A.

That is SMALL?!

Regards zeoN_Rider

HK26147 · 20th January 2009, 12:38 AM

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.

Eva · 20th January 2009, 12:39 AM

Average power drawn with full volume music is likely to be around 10% of rated power at best, so no problem.

Saturnus · 20th January 2009, 01:42 AM

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.

Pano · 20th January 2009, 03:37 AM

Quote:

Originally posted by Saturnus
Just remember not to turn all amps on at the same time.

That's 4 sure!

winny · 20th January 2009, 08:24 AM

Quote:

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 :-)

col · 20th January 2009, 08:41 AM

If you play Chemical Brothers at full volume with 115k watts you would need to be about 20km away

col.

19th January 2009, 11:58 PM	#1
fb diyAudio Member Join Date: Apr 2005 Location: Brisbane, Aus	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.... Thankyou

20th January 2009, 12:03 AM	#2
zeonrider diyAudio Member Join Date: Mar 2004 Location: Belgrade RS	Hi! 30 Small, 2700W???????? Regards zeoN_Rider

20th January 2009, 12:10 AM	#4
zeonrider diyAudio Member Join Date: Mar 2004 Location: Belgrade RS	Re! In my house I have 3 Phase, each phase have fuse 25A. That is SMALL?! Regards zeoN_Rider

20th January 2009, 12:39 AM	#6
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Average power drawn with full volume music is likely to be around 10% of rated power at best, so no problem. __________________ I use to feel like the small child in The Emperor's New Clothes tale

20th January 2009, 08:41 AM	#10
col diyAudio Member Join Date: Feb 2008 Location: Melbourne, Victoria, Australia	If you play Chemical Brothers at full volume with 115k watts you would need to be about 20km away col. __________________ http://www.minirig.org.au


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20th January 2009, 12:06 AM	#3
fb diyAudio Member Join Date: Apr 2005 Location: Brisbane, Aus	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

20th January 2009, 01:42 AM	#7
Saturnus diyAudio Member Join Date: Jun 2005 Location: Copenhagen, Denmark	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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