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AES vs RMS
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simonh View Drop Down
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    Posted: 11 November 2010 at 6:49pm
Hi Guy's

Sorry, newbie question, what's the difference between AES & RMS?

Regards
Si.
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Mircea Bartic View Drop Down
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about 20-30%

800W RMS = about 1000-1100W AES
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GEB View Drop Down
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AES power handling is perhaps one of the best defined ratings for loudspeakers.

It is simply pink noise filtered between 125Hz and 8kHz with a peak to average ratio of 6dB and applied over a period of two hours. It is one of the better indicators of both the thermal and mechanical aspects of power handling.

^ Found this on another website, hope its helpfull.
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so if i have a bass bin at 1600w aes then an amp of about 1200w rms would be about right for it?
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Originally posted by markjameslong markjameslong wrote:

so if i have a bass bin at 1600w aes then an amp of about 1200w rms would be about right for it?
Nope, as you want to have sufficient amp "headroom" to allow for utilization of the higher program/peak rating, which is usually quoted as double/quarduple (respectively) of the RMS (or AES) rating.

Therefor the recommended ratio is usually 1.5 to 2 times amp power to speaker power.

Nevertheless, it would be ok to use a 1200W amp on a 1600W bin, but you would probably be far from getting the most out of your speakers. Just don't let the amp clip too much (or at all), because you could easily fry the drivers like that (yes even if the drivers are 1600 and the amp "only" 1200W).

Hope it helps, cheers..


Edited by daywalk3r - 11 November 2010 at 8:34pm
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markjameslong View Drop Down
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ok, i see, so what would u recomend?
thanks
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what about brickwalled dubstep?  playing out of a laptop with a hacked copy of ableton?  there aint any peaks there, its just one squashed, badly mixed peak.  1200w rms will over heat just about any woofer over a 2hr period in situations like this.
REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :)
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Originally posted by markjameslong markjameslong wrote:

ok, i see, so what would u recomend?
thanks
To at least match the AES rating of the bin with the RMS rating of the amp Big smile
As I meantioned above, a 1.5 ratio between amps/speakers is a good starting point. But you don't really have to approach it in such a detail as the marketing departments of many of the amp brands/manufacturers sometimes go pretty delusional when it comes to printing numbers on the spec sheets of their products. - eg. the RMS/AES difference will be relatively negligible in comparison.
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markjameslong View Drop Down
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so how would you get around that in a practile way rich?
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markjameslong View Drop Down
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day walker:

ha ha, shame there isnt one tryed and tested means of it all really.  but makes it all the more intresting i guess...

onwards and up...
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daywalk3r View Drop Down
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Originally posted by rich_gale rich_gale wrote:

there aint any peaks there, its just one squashed, badly mixed peak
"squared" would be the correct word in that case, I believe Big smile and that's a pretty simmilar case to the amp-clip scenario, just that the source of the problem is not the amp.

A clipped signal is bad, regardless of wether it's origin is at the end or beggining of the signal chain..
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Originally posted by markjameslong markjameslong wrote:

ha ha, shame there isnt one tryed and tested means of it all really.  but makes it all the more intresting i guess...
Yes, there are no stone-set rules, only widely accepted recommendations, which are 1.5 to 2 for amp/speaker power matching. And there is a wast amount of "tryed & tested" equipment around, so meeting/following these recommendations is not that hard, but it can get a bit pricey in some cases though Smile
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