Questions re: bass management with H/K AVR320 with DVD-A / SACD + Why 24/192 DACs?

Discussion in 'Archived Threads 2001-2004' started by Alex.D, Jan 5, 2003.

  1. Alex.D

    Alex.D Agent

    Joined:
    Dec 9, 2002
    Messages:
    33
    Likes Received:
    0
    I'm curious about how an AVR320 does bass management for analog inputs internally - whether it's an analog crossover, or whether the signal goes back into the digital domain.

    If it's analog, I can definitely see that using a high-quality source, such as SACD or DVD-A makes sense even with bookshelf speakers that require bass management. We filter frequencies below 100hz or 80hz, send that to the speakers, and send the ".1" input + bass from other channels to the sub.

    If it's digital, then things become really silly really quickly. What's the resolution / sampling rate of the AVR320's ADC's then? If it's below 24/192, is there a point to using high-rez signals from the DVD-Audio player?

    The situation is even worse with SACD. Assuming no bass management on the behalf of the player, we get DSD -> analog -> PCM -> analog. If my understanding of DSD's advantages is correct, the point of SACD is that you have insane temporal resolution (.00000036 seconds for SACD vs. .000005 for 192khz DVD-A, or fifteen-fold improvement). Then, by applying digital bass management, you lose this advantage entirely!

    CD's sound just dandy on the receiver using digital output on a DVD player, and via analog using my old(er) CD player.

    However, I am looking to buy a DVD player with one of the high-rez format support, and I'm curious as to the signal degradation that comes from using these multiple A/D and D/A conversions. If, given my current setup (changing receivers is not much of an option, given the low price I paid for the AVR320, which basically sparked me getting into the whole Home Theater thing), I have to use bass management of analog inputs, I don't think there is a point in having high-rez formats given the state of consumer-level equipment (aside from multichannel advantages, but they are already afforded by DTS CD's).

    Is there a DVD-A player that can have its 24/96 and 24/192 outputs "unlocked" for digital output? That's the only application I can think of for those 24/192 DACs in the receiver.

    This brings me to my second question - Why ARE There 24/192 DACs in the receiver? Since the highest-rez format most DVD players can put out digitally is 24/48, there's no point in having DACs more powerful than that. What device can put out a 24/96 or a 24/192 stream?
     
  2. Stephen Dodds

    Stephen Dodds Second Unit

    Joined:
    Aug 29, 1998
    Messages:
    354
    Likes Received:
    0
    Most DVD players can output 24/96 digitally. Trouble is, only a few discs have it, from a few audiophile labels.

    But you are correct, if you do bass management on the analog inputs you will be adding another A/D D/A stage.


    Steve
     
  3. Jose G

    Jose G Supporting Actor

    Joined:
    Aug 18, 2002
    Messages:
    568
    Likes Received:
    0
    I guess the 320 doesn't have a stereo direct (bypass) mode. I know the new HK x25 models seem to have this as an option, bypassing all digital processing.
     
  4. Alex.D

    Alex.D Agent

    Joined:
    Dec 9, 2002
    Messages:
    33
    Likes Received:
    0
    So then, if bass management requires A/D - D/A conversion, is the quality improvement still worth it over running a coax in from a CD or DVD transport?
     
  5. Craig F

    Craig F Second Unit

    Joined:
    Jul 5, 2001
    Messages:
    276
    Likes Received:
    0
    Real Name:
    Craig
     

Share This Page