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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Bi-amping and Speaker Efficiency posted by Bud on April 10, 2007 at 12:03:14:
Speaker efficiency is speaker efficiency. However, if you are doing simple bi-amping with separate level controls, you can sometimes gain efficiency by removing built in level-matching resistor networks. Often these are put in to bring a tweeter's level down to the mid-woofer's. They are really just a waste of power when bi-amping.This all changes when using an active crossover though. Then the effective peak output power of the soeajers is much greater than people expect. The reason for this is that power is proportional to the voltage squared, like so:
P = V^2 / R
Consider this. A 100 watt amplifier puts out about 28.3Vrms across. With two such amplifiers working in separate areas of the spectrum,
the peak output is really 28.3Vrms x 2 = 56.6 Vrms. To do this with a single amplifier you would need a 400 Watt amp.However, it's really unusual to have a tweeter and mid/woofer of the same efficiencies. Often the tweeter is much more efficient, so a modest amplifier, say a 50-75 Watt amp up there and 150-200 watts for the lows is a good set up, delivering much more power than purchased.
Regards,
Erik
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Follow Ups
- Re: Bi-amping and Speaker Efficiency - erik_squires@hotmail.com 20:08:46 04/15/07 (0)
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