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What's the difference? (Please Help)

Discussion in 'AV Receivers & Amplifiers' started by gusscottexley, May 3, 2001.

  1. gusscottexley

    gusscottexley
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    Hi there, I am hoping you experts can help me. I am looking to buy a AMP capable of decoding Dolby Digital 5.1. I see lots of AMPS with just "Dolby Digital" on them, does this mean that they are 5.1? also some say (AC3) what's the difference between AC3 and 5.1? Thanks peeps.
     
  2. MarkB

    MarkB
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    Yes.
     
  3. gusscottexley

    gusscottexley
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    Sorry to bother you AGAIN! but I don't have a lot of cash and I am looking for the cheapest Dolby 5.1 decoder and amps (combined) I can get, any ideas? (I can't really affor to spend more than £150.
     
  4. Reiner

    Reiner
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    Just for the record: Dolby Digital is not necessarily 5.1 as it can be anything between 1.0 and 5.1 though when written on the amp / receiver it will be 5.1 compatible (hopefully ;) ).

    As for a budget amp I recommend Yamaha DSP-A5 but it won't go for GBP150 ... sorry.
     
  5. MarkB

    MarkB
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    Dolby Digital has a minimum of 5 speakers, plus a subwoofer channel. This is a 6 channel system but it is written as 5.1 because the information required for the subwoofer channel is approximately 10% of that of a full range channel. AC3 is the original term for Dolby Digital. So, Dolby Digital is 5.1 anyway, and AC3 means Dolby Digital.

    Mark
     
  6. gusscottexley

    gusscottexley
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    So if something says it's AC3 then it is 5.1 yes? (they are the same?)
     
  7. MarkB

    MarkB
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    Reiner,
    I disagree, you are referring to the source material, not the amplifier. If Dolby Digital is written on the amplifier it MUST be (at least) 5.1 compatible.

    GUS,
    Try Richer Sounds, I can't guarantee that you will get a DD5.1 amp for £150, but they generally have good deals on.

    Mark
     
  8. gusscottexley

    gusscottexley
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    Thank Mark. You da man!
     
  9. buns

    buns
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    Your should be able to get the kenwood 5030 for less that £150 from richer sounds.....a minor bargain, but i have a yamaha A5 abd agree that if u can u should pay the little bit more.....and remember that the A5 is going to be heavily discounted as it is being replaced very soon!
     
  10. gusscottexley

    gusscottexley
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    Cheers Buns.
     
  11. MarkB

    MarkB
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    Ok then but you missed the fact that DD can go to 6.1 ;)

    Mark
     
  12. Stuart M. Robinson

    Stuart M. Robinson
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    MarkB wrote:

    “Ok then but you missed the fact that DD can go to 6.1”

    It can’t, Dolby Digital is limited to 5.1 – 3/2.1.


    Stuart M. Robinson
    SMR Group – http://www.smr-group.co.uk/
     
  13. Matty N

    Matty N
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    True,

    but the bitrate is variable :p
     
  14. Reiner

    Reiner
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    Mark, that's exactly what I said, isn't it?

    ... though when written on the amp / receiver it will be 5.1 compatible ...
     
  15. MarkB

    MarkB
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    THX Surround EX is 6.1 channel, in that you need six channels of amplification (seven if you want to have 2x rear as THX specifies), although the sound is carried in 5.1 channels with the rear matrixed. THX Surround EX is carried as Dolby Digital.
    Since the discussion originally posted by GUS was concerning the amplifier stage, and not the software, I said that a Dolby Digital amplifier will be at least 5.1 channels.
    Of course, within those channels you can have 1, 3, 5 or whatever subset of channels you like, but an amplifier marked Dolby Digital, AC3 or 5.1 will have 5.1 channels. I was trying to keep my reply as simple as possible, but thanks for your input.

    Mark
     
  16. Guest

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    AC3 = Audio Code 3 also commonly to (as a more consumer friendly title) Dolby Digital, which encompasses everything from Mono to 5.1 and all between. I believe 6.1 (dolby) IS officially refered to as THX EX but most manufacturers of hardware and software would refer to it as Dolby Digital.

    Regards

    SteveEX
     
  17. Confucius

    Confucius
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    If nothing else this thread proves just how misleading the term DD 6.1 is.

    It is, and always has/will be, correct only to refer to it as either 5.1 EX or THX EX.
     
  18. Reiner

    Reiner
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    The only true 6.1 system commonly available is DTS Es Discrete.
    Matrix systems like Ex/Es are correctly referred to as 3/2:3.1
     
  19. Confucius

    Confucius
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    Exactly correct Reiner.
     

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