How to setup AV decoder in balanced pre/power setup

Discussion in 'Video Cameras' started by deja, Jul 29, 2005.

  1. deja

    deja Guest

    I've got a CD player with combined pre-amp (ie digital volume control
    and input selector), it has 4 digital inputs (set top box and DVD
    player audio), and analogue outputs direct to the power amps via
    balanced XLR leads.

    My question is - how would I slot in an AV decoder into this setup in
    order to:
    - continue using the balanced type connections between CD and amps
    - use the CD's DAC capability to decode the DVD audio and drive my
    existing 2 channel amps/speakers while adding in another 3 channel amp
    for RCentre, R&L Rear?

    A diagram would sure help. Or if I wanted a multi channel setup, would
    I let the AV decoder box do all the DVD DAC?
     
    deja, Jul 29, 2005
    #1
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  2. deja

    John Russell Guest

    You want the Yamaha DSPE800. This is Surround Decoder/amp but only amps for
    center and rear surround. You continue to use your Hi-Fi for Front
    Left/Right. I don't think it has digital front/left right output though. It
    assumes that most peole with have an ordinary analoge Hi-Fi inputs. So you
    connect the front left/right outputs from the decoder to a spare pair of
    analoge inputs on the hi-fi pre-amp.
     
    John Russell, Jul 29, 2005
    #2
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  3. deja

    deja Guest

    Thanks John. I don't have any analogue inputs on the preamp, only
    digital. Are they AV decoders that provide a "pass through" for the 2
    hifi channels, so the AV box is invisible for hifi use, but kicks in
    somehow for multi channel use? If so, then I'd also want XLR
    inputs/outputs for the hifi and its all this that I'm coming to beleive
    is not very common.
     
    deja, Jul 31, 2005
    #3
  4. deja

    John Russell Guest

    I doubt it. Rember the more you want something "out of the ordinary", the
    more it costs.
     
    John Russell, Jul 31, 2005
    #4
  5. deja

    John Russell Guest

    Does your Pre-amp have any kind of Digital Out for recording purposes?
     
    John Russell, Jul 31, 2005
    #5
  6. deja

    John Russell Guest

    What I was thinking won't work.
     
    John Russell, Jul 31, 2005
    #6
  7. You are probably on the right lines. If deja's CD player has a tape
    monitor loop then that can be used.

    If not then he could go for a real professional Dolby decoder which will
    be fully balanced (see www.hhb.co.uk for Dolby gear). The other
    possibility would be to use a balanced to unbalanced convertor which are
    fairly widely available from professional audio dealsers - again, HHB
    would one source and http://www.studiospares.com would be another,
    possibly cheaper, source.

    Cheers.

    James.
     
    James Perrett, Aug 1, 2005
    #7
  8. deja

    John Russell Guest

    But he dosn't want to have two sets of speakers. That means he needs to
    seperate off front left/right and use his hi-fi for that, whilst getting
    another amp /speakers for the rest.
     
    John Russell, Aug 1, 2005
    #8
  9. deja

    deja Guest

    I have the option of adding a digital out card which would be £1000...

    I was told some kind of setup was possible, I need to go back to this
    chap and ask him exactly how! Maybe he's got some exoctic box of tricks
    in mind.

    David
     
    deja, Aug 4, 2005
    #9
  10. deja

    John Russell Guest

    I have the option of adding a digital out card which would be £1000...

    I was told some kind of setup was possible, I need to go back to this
    chap and ask him exactly how! Maybe he's got some exoctic box of tricks
    in mind.

    David

    If you don't want two sets of speakers you need to seperate the front
    speakers from any surround stream for use by the hi-fi part of your system.
    A digital output would just send all the stream to another device, without
    extracting the front left/right audio.

    It looks like you have a very expensive Hi-Fi only system. You may find the
    only option is to have a separete room for that, and get a complete Home
    Theater system for the TV room.
     
    John Russell, Aug 4, 2005
    #10
  11. A digital output to a decoder is exactly what is needed. A professional
    decoder would then output all the channels on balanced connectors like the
    original poster is already using so he would only need to purchase the
    extra active speakers needed. With a decent decoder stereo material would
    pass through as before while the decoder would route the multichannel
    audio to the additional speakers when needed.

    Cheers.

    James.
     
    James Perrett, Aug 4, 2005
    #11
  12. deja

    John Russell Guest

    If it costs £1000 just for a digital monitor card I dread to think how much
    a pro-quality decoder is going to cost!
     
    John Russell, Aug 4, 2005
    #12
  13. deja

    Tony Morgan Guest

    Are we talking about a DVI card/monitor here?
     
    Tony Morgan, Aug 4, 2005
    #13
  14. deja

    John Russell Guest

    Nope a digital audio output card for a very esoteric piece of Hi-FI!
     
    John Russell, Aug 4, 2005
    #14
  15. deja

    deja Guest

    I think James hit the nail on the head. I need a "professional" decoder
    that takes as input, the digital output from the CD/DAC/preamp Wadia
    861 player. The DVD player is plugged into the Wadia and the decoder
    sits between the Wadia and the existing power amps, and also connected
    to a 3 channel amp for the other rear and centre speakers.

    The decoder would "pass through" via balanced connectors the front L&R
    speakers which the Wadia is driving, but when playing DVDs, the decoder
    picks up the digital signal and adds in the additional 3 channels via a
    separate amps and speakers.

    Given the price of the existing kit involved (the RRP for my balanced
    leads is over £1k) this is going to get extremely expensive!! I'd need
    the decoder (£££s), another set of XLR leads (£1k), digital output
    card (£1k), 3 channel amp and 3 speakers.

    Can anyone point me to a "professional decoder" so I can investigate
    its specs and price?

    Thanks, David
     
    deja, Aug 5, 2005
    #15
  16. A genuine Dolby decoder is going to cost around 3000 pounds (from HHB) and
    I would guess that a DTS decoder would be a similar amount. I can't help
    thinking that there are better ways to achieve the same thing but the
    original poster seems attached to his setup.

    I'd maybe suggest talking to a company like Crookwood to see if they could
    build a custom system to exactly match the requirements.

    Cheers.

    James.
     
    James Perrett, Aug 5, 2005
    #16

  17. To be honest - if you want a good sounding surround system then I would
    talk to someone like Crispin at Crookwood who will probably be able to
    build you a decoder/speaker control system that will sound as good as you
    can get without ripping you off as badly as you've been ripped off so far
    with those cables.

    If you just want a professional Dolby decoder then talk to the people at
    HHB (http://www.hhb.co.uk) in London or another audio post-production
    supplier. They'll also be able to supply top quality XLR cables and
    reasonable prices - you really don't need to spend that much money.

    Cheers.

    James.
     
    James Perrett, Aug 8, 2005
    #17
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