THX Receiver Processing Mode with non-thx DVDs?

Discussion in 'Archived Threads 2001-2004' started by Matt Odegard, Nov 9, 2002.

  1. Matt Odegard

    Matt Odegard Stunt Coordinator

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    If you have a reciever with THX processing. Can you ONLY use the THX processing with DVD's that are in THX? Or is it all in the processor for THX and you can have this sound no matter what the DVD format is in?
     
  2. Brenton

    Brenton Screenwriter

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    You seem to be under the impression that THX is a sound format, such as Dolby Digital, or DTS. It's actually not, it's a certification system that is meant to be a "seal of approval" that the technology used to master the video and sound was up to all THX standards, and that the result is of THX's standard of quality. Unfortunately, the latter is not emphasized far enough.
     
  3. Matt Odegard

    Matt Odegard Stunt Coordinator

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    The later is. If I have a DVD in DD or DTS can I use the THX processing for better sound? Or am I limited to the DD and DTS? I'm not quite sure if I asked this right as I don't have a reciever as of yet.
     
  4. Vince Maskeeper

    Vince Maskeeper Producer

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    THX processing is little more than a re-eq that rolls off top end freq ("treble", if you will). You can engage this re-eq on any soundtrack, THX or not.

    In addition, it's worthwhile to note that several non-THX products offer an identical feature, and they simply call it Re-eq.

    THX processing will often add little in the way of "better sound"-- it simply offers a high end roll off for overly bright soundtracks (namely ones that were not corrected for the theatrical X-curve.)

    Vince

    PS: Since you question regards the receiver itself and its functions & processing modes, I have moved this thread to Hardware Receivers Area.
     
  5. Steve Tannehill

    Steve Tannehill Ambassador

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  6. Matt Odegard

    Matt Odegard Stunt Coordinator

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  7. Justin Lane

    Justin Lane Cinematographer

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  8. Brenton

    Brenton Screenwriter

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  9. Jason_Els

    Jason_Els Screenwriter

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    But you can also choose not to apply it (and I think this answers your original question). You can have turn on THX processing for any digital source or equally turn it off. Doesn't matter if you're using Dolby or DTS or whatever else. Listen to sources with THX on and off and see which you prefer. Not all movies sound best with THX processing on.
     
  10. Robert McClanahan

    Robert McClanahan Stunt Coordinator

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    THX processing also performs two other critical tasks.Timbre matching and adaptive decorrelation.Timbre matching gets all the speakers to have identical tonal quality,even if you have different brands for the center and surrounds and mains.It works.Adaptive decorrelation creates a seamless surround sound and it really works well.THX post processing does what it is designed to do.It takes alot of the guess work out of how a movie should sound in a hometheater.I could go on and on but I dont want to bore you people.[​IMG]
     
  11. Andrew Pierce

    Andrew Pierce Stunt Coordinator

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  12. StephenL

    StephenL Second Unit

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    THX home page:
    http://www.thx.com/
    Sound & Vision magazine: THX Certified
    http://www.soundandvisionmag.com/Buy...?ArticleID=171
    Sound & Vision magazine: Inside THX
    http://www.soundandvisionmag.com/Sou..._cm_00,00.html
    Sound & Vision magazine: Behind The Numbers: Digital Sound Receivers (includes THX crossover spec)
    http://www.soundandvisionmag.com/Buy...p?ArticleID=66
    AVS Forum thread: THX certification process
    http://www.avsforum.com/avs-vb/showt...hreadid=122172
    What is THX Home Cinema?
    http://membres.lycos.fr/tessier/thx.htm
    How THX works (theaters)
    http://www.howstuffworks.com/thx.htm
    Lucasfilm THX & Dolby Pro Logic Frequency Response Plots
    http://www.cybertheater.com/Tech_Arc..._pro_freq.html
    Tom Holman interview
    http://www.mel-lambert.com/Writer/In...om_Holman.html
     
  13. Matt Odegard

    Matt Odegard Stunt Coordinator

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  14. Robert McClanahan

    Robert McClanahan Stunt Coordinator

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    Andrew, here is what the Rotel RSP-985 owners manual says about timbre matching.What I said about it is simply the way I understood it.
    Timbre Matching: The human ear changes our perception of sound depending on the direction from which the sound is coming.In a movie theater,there is an array of surround speakers so that the surround information is all around you.In a home theater,you only use two speakers located to the side of your head.The Timbre Matching filters the information going to the surround speakers so that they more closely match the tonal characteristics coming from the front speakers.This insures seamless panning between the front and surround speakers.Thats what Rotel says,now from my experience it blends the tonal qualities of all five speakers very nicely.[​IMG]
    Adaptive Decorrelation: In a movie theater,a large number of surround speakers help create an enveloping surround experience.In a home theater,there are only two surround speakers which can reduce spatiousness and envelopment.Surround sound can also collapse into the closest speaker as you move away from the middle seating position.Adaptive Decorrelation slightly changes one surround channels time and phase relationship with respect to the other surround channel.This expands the listening position and creates the same spacious surround experience as in a movie theater. This too comes from Rotel and it too works very well.[​IMG]
     
  15. Andrew Pierce

    Andrew Pierce Stunt Coordinator

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    Ah, so sort of a reverse HRTF filter? That makes some sense. 'Timbre matching' sounds like it something to fix mismatched speakers, sort of (very 'sort of') like how the higher end Pioneer Elites can autocalibrate to flatten speaker response.
     

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