reference level

Discussion in 'Subwoofers' started by killer10971, Aug 20, 2006.

  1. killer10971

    killer10971
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    probably an obvious question but im new to this

    what is "reference level" on the bass power setting (midway between min and max) on my sub

    cheers
     
  2. Steve.EX

    Steve.EX
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    Crudely put, set up your sub using the test-tone of your processor to give 75db (or 85).
    The LFE test tone should be set to 0db and the subs volume control operated until the 75/85db is achieved. 75 or 85 is usually specified within the processor manual as is generally dependant upon manufacturer.

    Put in Finding Nemo DVD
    Select Dolby Digital
    Select the Darla or Whale scene.
    Turn your processor volume to 0db.

    Press play

    Watch your windows blow out (if your subs up to it)
     
  3. killer10971

    killer10971
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    now thats a good answer :)

    many thanks

     
  4. micb3rd

    micb3rd
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    The test tones/noise are recorded at a lower level than full reference within processors or test dvds.

    The reason the tones/noise are recorded at a lower level is so you can balance/set up you Home theater with out going deaf in the process.

    The tones/noise are recorded at -20db below reference for something like the AVIA DVD and -30 db below ref for internal tones from an AV Receiver/processor.

    The basic method is to the the Receiver/Processor set to 00 and the tone/noise is played through each channel, you then balance all speaker channels levels to 75db or 85db on the SPL meter depending on the level of the source the tone/noise is from.

    Full Dolby reference is usualy peaks of 105db per channel and 115db for LFE,
    if you use bass management as well then you need more output from the subwoofer than this as it will be passing bass from the main channels to the subwoofer(at least a db per channel so 121-125db peaks may be seen).

    This obviously shows many subwoofers are not up to giving full Dolby Reference levels!
     
  5. Steve.EX

    Steve.EX
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    Yup.
    It is staggeringly loud in anything but the very largest rooms.
     
  6. killer10971

    killer10971
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    so when setting the level for my sub should i play the tones at 0db on the receiver and then turn the sub up until it registers 75/85 db on my spl

    cheers
     
  7. Badger0-0

    Badger0-0
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    Yep that's it mate. :smashin:
     
  8. Member 96948

    Member 96948
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    ********WARNING********

    Once you have everthing calibrated to 'reference level', TURN IT DOWN BY AT LEAST 10dB before you throw on Darla Taps Tank/ Master and Commander/LFOTP/U-571. Otherwise you may witness cone excursion in the regions of metres rather than millimetres and a hefty repair bill.

    Reference level is merely a measurement, not a goal at all costs.

    Russell
     
  9. joffy1780

    joffy1780
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    :lesson: :smashin:
     
  10. AngelEyes

    AngelEyes
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    Speak up sonny, I can't hear ya?
     

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