On Wed, Mar 16, 2005 at 12:49:55AM +0200, Jussi Laako wrote: > On Tue, 2005-03-15 at 19:54 +0100, Fons Adriaensen wrote: > > > That would completely obliterate the efficiency of the PWM mode amplifier. > > Compared to what? Typical analog class-A or high biased class-AB?
You can't get worse than class-A (for power efficiency). Maybe the ideal solution is a passive attenuator between the amp and the speaker, using big variable resistors as you can see in picturese of in Einstein's lab :-) A purist's solution could be to replace the speaker's permanent magnet by a regulated DC-powered one... -- FA
