THX crossover specs

Discussion in 'Archived Threads 2001-2004' started by JonahWicky, Jan 16, 2002.

  1. JonahWicky

    JonahWicky Stunt Coordinator

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    I see frequent mention made to "THX crossover specs". What exactly are the specs? Is 80 hz the accepted standard for crossover to a sub? Is there a mid-range crossover spec as well?
     
  2. Scott Simonian

    Scott Simonian Screenwriter

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    It is just the standardized (by THX) x-over point in which all speakers in a system are crossed over to the sub.

     
  3. Brian Bunge

    Brian Bunge Producer

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    I believe the THX spec is 24dB/octave at 80Hz low pass and 12dB/octave at 80Hz high pass.

    Brian
     
  4. Scott Simonian

    Scott Simonian Screenwriter

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    Ah yes. Forgot about that.
     
  5. Grant B

    Grant B Producer

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    just curious

    does anyone here use an active external crossover for their speakers?

    mcmelctonics is offering a 3 way stereo rack mounted one for under $200.

    i guess this bypasses your speakers internal xover...

    with all the adjustments it seems like you really can fine tune your system. can this be done by ear (spl meter) or do you need to scope it to do it properly?

    any advice appreciated!

    grant
     
  6. Brian Bunge

    Brian Bunge Producer

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    Grant,

    I'll eventually be using a 3 way crossover between my ACI Emeralds, dual 12's, and a dedicated 18" sub. What's the model number of that crossover from MCM? I'd like to check it out!

    Brian
     
  7. Grant B

    Grant B Producer

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    it is in their latest sale catalogue, should be able to find it on their website.
    if you can't find it, email me and I will find out the details for you (It's at home, I am at work now)
    [email protected]
     
  8. BruceD

    BruceD Screenwriter

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    I use a Marchand XM9-L (symmetrical 24dB L-R) between my Dynaudio Contours and my M&K sub, crossover at 60Hz.
    The Marchand has really great specs, like S/N ratio of 110dB which makes it transparent.
    This setup outperforms the crossover in my processor and I get to use it in 2-channel as well.
    Marchand
     
  9. James Mudler

    James Mudler Stunt Coordinator

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