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Dolby Digital Test Tones

Discussion in 'Home Cinema Speakers' started by miguelj, Sep 20, 2002.

  1. miguelj

    miguelj
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    I want to calibrate my speakers using a SPL Meter and I need to generate some test tones.

    All the tones that I get from the net are only stereo.

    My question is what to do with the LFE and the Rear chanels in Dolby Digital?

    Should I code the LFE and Rear chanels or leave them silenced? In my AV Reciver all the speakers are configured as small, an SW Otuput at Both, if I generate a tone at 40Hz and put it at the two main speakers then the AV sends that tone to the SW right? If so, if I put the same tone at the LFE chanel, is the bass is going to be stronger them if I leave the LFE chanel silenced?

    How should I code the 5.1 chanel in my test tones? should I put the same tone in all the chanels or only in the 2 front speaker?
     
  2. S H A D O

    S H A D O
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    Hi

    Why not buy a test disc such as AVIA or Video Essentials??

    AVIA available from www.ovationsw.com

    Video Essentials from www.ezydvd.com.au

    At least you´ll know these test discs have all the their test tones recorded correctly and will help you balance your AV system properly.:)
     
  3. GOODMAP

    GOODMAP
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    Or if you got Star Wars Episode 1 or Monsters Inc on DVD they both have THX Optimizer on them which provides 5.1 channel test tones.
     
  4. Apocalypse

    Apocalypse
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    One thing puzzles me with test tones, to get 75db pink noise with Video Essentials requires a very high volume, to get 75db pink noise with The Ultimate DVD Platinum requires a lot less volume so which one is more accurate. I'd say the test tones at 75db that are closer to your listening levels are more accurate surely, your thoughts?
     

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