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Posted by Sunny (148.87.1.170) on March 19, 2003 at 06:12:09:
In Reply to: Re: pmpo vs rms posted by KC on December 27, 2002 at 06:18:14:
RMS and peak power (PMPO) are related through the dynamic headroom specification given in dB. An amplifier with 3dB of dymanic headroom will have a peak power of double its RMS or average power. So an amplifier rated at 100 watts RMS with a dynamic headroom of 3dB will have a peak power output of 200 watts. Note that the dynamic headroom figure is given in decibels (dB), which use a logarithmic scale. Every 3dB increase results a doubling in power. So if an amplifier had a dynamic headroom of say 6 dB and an RMS power rating of 100 watts then its peak power output would be 400 watts (double 100 to 200 then double 200 to 400). Note that most good quality amplifiers have dynamic headrooms ranging from 1.5 to 3dB. Very high numbers typically mean the amplifier uses a poor power supply only able to provide short bursts of power.