Posted by Budd on December 04, 2004 at 08:11:16

I'm quite interested in a GCC 100. I'm just wondering why it does not have a digital input to keep the signal in digital domain. Given the buzz around certain digital receivers, this seems a real benefit.

• Re: Digital Input to GCC? - paulmc 08:15:03 12/04/04 (4)
  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.
  
  

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  • PCM to PWM? - Budd 08:42:07 12/04/04 (3)
    In Reply to: Re: Digital Input to GCC? posted by paulmc on December 4, 2004 at 08:15:03:

    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,
    
    

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    • Re: PCM to PWM? - smac770 19:55:05 12/05/04 (2)
      In Reply to: PCM to PWM? posted by Budd on December 4, 2004 at 08:42:07:

      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.
      
      

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      • Re: PCM to PWM? - Budd 19:58:04 12/07/04 (1)
        In Reply to: Re: PCM to PWM? posted by smac770 on December 5, 2004 at 19:55:05:

        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?
        
        

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        • Re: PCM to PWM? - paulmc 06:00:20 12/08/04 (0)
          In Reply to: Re: PCM to PWM? posted by Budd on December 7, 2004 at 19:58:04:

          Right. There is no D/A converter anywhere near this amplifier. It is a 100% analog PWM device.
          
          

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