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In Reply to: Digital Input to GCC? posted by Budd on December 4, 2004 at 08:11:16:
Because it's never in the digital domain in the first place. Switching amplifiers are 100% analog - and of course our calling it a digital amp doesn't help people understand that - we should probably explain more of how it's analog rather than digital.
Thanks for your quick reply!I read something about converting from PCM to PWM in digital domain and PWM controls the amp. Is this not the case?
Regards,
IIR(read)C, the GCC is an "integrated amp", and the "volume control" stage is the GainCell, which is an analog circuit. So if you did have a digital bypass input to go along with the HT Bypass input, you'd have to have a digital pre-amp such as the Meridian 518 to have any volume control on the "digital bypass input" (like your A/V receiver is the volume control for the HT Bypass input).That said, a Meridian 500 feeding a Meridian 518 feeding a digital input on an integrated amp, direct with no D/A stage in the entire path, might be a nice replacement for a Meridian 508 feeding a traditional analog input integrated amp. Can't say without trying, and trying doesn't look like something that will be possible.
But I don't know what's involved with SPDIF-> PWM conversion. This may not be any better than D/A followed by the typical sawtooth sampler.
Okay, so the Gain Cell is an analog device providing the variable gain and the power section is a fixed gain digital amp.In "SDAT Explained", it said that it does not require an D to A processor, hence, my original question. Is there an A to D converter inside for the digital amp?
Right. There is no D/A converter anywhere near this amplifier. It is a 100% analog PWM device.
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