What's the diff between a calibration DVD and the white noise

Discussion in 'Archived Threads 2001-2004' started by Rod Melotte, Feb 12, 2002.

  1. Rod Melotte

    Rod Melotte Stunt Coordinator

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    What's the diff between a calibration DVD and the white noise test thingy that comes with my reciever. Am I missing out on some tweaks?
     
  2. Vince Maskeeper

    Vince Maskeeper Producer

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    The tones would probably be, essentially, the same in content for calibration levels. However, I have found maybe 60% of receivers tones to be INCORRECT in level calibration. So while the freq content of the tones might be the same, it's hard to tell if yours will be giving you correct settings.

    In addition, discs like Avia also offer other audio test like:

    Testing the phase of all the channels in the system.

    Bass rerouted from other channels tests.

    Freq sweeps to test freq response of your sub.

    Warble tones to configure phase setting on the subwoofer.

    I think it even offers a delay test.

    Not to mention the video signals and other test material on this disc.

    -Vince
     
  3. Bill Catherall

    Bill Catherall Screenwriter

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    Not to meantion that a calibration DVD has video patterns to help you properly calibrate your TV.
     
  4. BruceD

    BruceD Screenwriter

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    In the case of Video Essentials, I believe they use what is called shaped pink noise. Unlike white noise, this is not all frequencies, but a select subset of frequencies. For instance, the LFE test tone frequencies are 20Hz-80Hz shaped pink noise. Pink noise being, in general, not all frequencies like white noise.
     
  5. Ted Lee

    Ted Lee Lead Actor

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    plus, in my case the measurements were different when calibrating from the receiver vs the dvd.

    going through the dvd is better...it includes the entire "sound chain" so you get a more accurate representation of the path the sound travels to get to your speakers.
     
  6. Scott Merryfield

    Scott Merryfield Executive Producer

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    In addition to the information listed above, be aware that some receivers will not put out a test tone for the LFE (i.e. subwoofer) channel, so there is no way to calibrate the subwoofer in relation to the other speakers without a calibration disc. For example, my old Sony DA50ES receiver lacked a test tone for the subwoofer.
     
  7. Vince Maskeeper

    Vince Maskeeper Producer

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