DD EX vs THX EX?????

Discussion in 'Archived Threads 2001-2004' started by Gary Hensley, Jul 23, 2002.

  1. Gary Hensley

    Gary Hensley Stunt Coordinator

    Joined:
    Sep 18, 1999
    Messages:
    86
    Likes Received:
    0
    Just got back my Onkyo 989V2 upgrade yesterday and plugged everything back in.

    I have a question regarding THX-EX and DD-EX. I was always under the assumption that they were one and the same thing. DD-EX was in the theaters and THX-EX was for hometheater. With the latest upgrade from Onkyo there is now a seperate mode for DD-EX mode and for THX-EX mode.

    I am guessing that there are EX DVD's out there that are not THX Certified and therefore you would use the DD-EX mode instead of THX-EX? Or possibly that the DD-EX mode does not incorporate some of the THX Re-EQ functions?

    Gary
     
  2. Dalton

    Dalton Screenwriter

    Joined:
    Aug 19, 2001
    Messages:
    1,198
    Likes Received:
    5
    Location:
    Rhode Island
    Real Name:
    Dalton
     
  3. Geoff S

    Geoff S Stunt Coordinator

    Joined:
    Jun 1, 2002
    Messages:
    239
    Likes Received:
    0
    DD EX is that actual decoded format, a 5.1 matrix where embedded data in the 2 surround channels is extracted and matrixed into the 6th channel, i.e the "rear center" or "surround back".

    THX Surround EX is just a Post Processing Alogrithem, like 'THX 5.1' is to Dolby Digital or DTS 5.1 or like how Pro-Logic is to a 2 channel source.

    THX Surround EX will encorporate Re-EQ, Adaptive Decorrelation, and Timbre Matching in the digital post processing domain, just like other versions of THX Post Processing do.

    One added benifit to haveing a receiver with THX Surround EX is that it can turn standard 5.1 sources into EX by creating the 6th channel inforation from the surrounds. I haven't used it before (On my Denon 4802 I have a 5.1 setup and not 6.1) but from what I hear it works pretty well... that is if you choose to spend the extra money on a THX receiver.
     
  4. Wes Stover

    Wes Stover Stunt Coordinator

    Joined:
    Nov 26, 2001
    Messages:
    52
    Likes Received:
    0
    Actually Geoff is mistaken. The initial version of EX was developed by Dolby and THX together and released initially as THX EX. The contract has now reached its end and Dolby can market EX without the THX moniker. Check the Dolby site.
     
  5. GordonL

    GordonL Supporting Actor

    Joined:
    Feb 14, 2000
    Messages:
    771
    Likes Received:
    0
    No, Geoff is correct. THX Surround EX includes the THX post-processing. Dolby EX does not. The only thing they have in common is deriving the 6th matrixed channel.
     
  6. Wes Stover

    Wes Stover Stunt Coordinator

    Joined:
    Nov 26, 2001
    Messages:
    52
    Likes Received:
    0
    I still stand by what I wrote. Initially Dolby EX did not exist as a consumer format. Only THX EX. Dolby Digital EX was developed together but not released in consumer equipment until recently. The only equipment able to decode the EX signal had the THX EX monikers.
     
  7. Gary Hensley

    Gary Hensley Stunt Coordinator

    Joined:
    Sep 18, 1999
    Messages:
    86
    Likes Received:
    0
    I agree with Gordon when I first asked the question this AM my onle guess what that the THX-EX added the Re-Eq where DD-EX doesn't.

    I am going to try and play an Auto-Detected DVD (From Hell or JP3) tonight and see if I can hear a sonic difference between the two. I am hoping it will automatically engage DD-EX and THX-EX when I choose the surround mode/thx mode.

    Still seems odd to me that they added this.
     
  8. Gary Hensley

    Gary Hensley Stunt Coordinator

    Joined:
    Sep 18, 1999
    Messages:
    86
    Likes Received:
    0
  9. Lewis Besze

    Lewis Besze Producer

    Joined:
    Jul 28, 1999
    Messages:
    3,134
    Likes Received:
    0
     
  10. Wes Stover

    Wes Stover Stunt Coordinator

    Joined:
    Nov 26, 2001
    Messages:
    52
    Likes Received:
    0
    Lewis,

    I stand corrected. I didn't even give thought to the pseudo chips.
     

Share This Page