Originally Posted by Foxbat121
Whatever happened to those Digital Amp chips that don't require a DAC? I remember Panasonic used to have a line of AVRs (I owned one) that use a TI chip that converts digital directly to speaker output.
well, Pioneer never used them
I'm sure you know that Pioneer never used a true "digital" amp as you describe it. from the Ice amps to the current IR class D amps, Pioneer's class D amps are analog with switching power supplies, so they take an analog signal from the preamp section and use switch mode class D amps to generate speaker level outputs. these class D amps are not digital
amps per se. they just pulse power in a very rapid full on/full off manner so it behaves similarly to PCM. the Icepower & IR class D amps are PWM switching amps. the input to the amp could be analog or digital but in Pioneer's case, they converted to analog using conventional DAC's before the preamp section.
DAC's >>analog preamps>>class D amps>>speakers
even one or two very experienced AVS'rs have mistakenly called the Icepower amp used in earlier Pioneer AVR's, digital amps that worked as you described & they'd be wrong. not referring to you Foxbat
one only has to go to B&O Icepower division's website and see the correct description of how they work. the current IR amps work the same way.
Even Pioneer didn't call them digital amps, in fact their literature used to accurately describe them as switch mode analog amps. I haven't checked lately but they may have given up trying to accurately describe them & just rolled with lay folks always calling them "digital" amps because lay folks don't usually take the time to understand the minute details of the technology
in addition to Panasonic, didn't Samsung also experiment with true digital amps in a receiver several yrs ago? or was planning to?Edited by ss9001 - 6/27/13 at 7:16am