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SPL Meter readings - how....?

Discussion in 'Home Cinema Speakers' started by Brad_Porter, Apr 8, 2003.

  1. Brad_Porter

    Brad_Porter
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    This is driving me insane. Is there any logical explaination to the below?

    I use a SPL meter to calibrate my speakers and also the calibration unit on my Cyrus AV8. Both give the same result.

    My back left and right speakers are around 2 meters from my head high up on the walls. Pretty much equal. I activate the test tones and calibrate all to 75db.

    However, the back left speaker always sounds too loud. But the reading is always 75db.

    How is this possible?

    Brad
     
  2. nathan_silly

    nathan_silly
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    There are various ways of getting the reading, either one is correct (or incorrect)...

    Pointing the SPL meter at each speaker during each tone
    Pointing the SPL meter at the screen
    Pointing the SPL meter towards the ceiling

    I use the first one.

    I've found dipole SPL reading is always off- are you using dipoles?
     
  3. deckard

    deckard
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    I take a different line to Nathan, hold the meter where your head is pointing directly up in the air.

    I disagree about directing it at the speakers as during a film your head should be still - ie looking at the screen, not looking around at the speakers, therefore it would be logical to measure at one fixed point/direction. Use a tripod if you've got one.
     
  4. wilber

    wilber
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    SPL meter calibrations using white noise are great, but I do believe in trusting your ears as well - If there's too much volume for your taste coming from the rears then turn them down to where you feel happy (I have mine a couple of db below "perfection")
     
  5. HotblackDesiato

    HotblackDesiato
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    Have you done a SPL/frequency sweep on the speaker that sounds louder...just wondering if its positioning is giving you a "peak" in a particularly noticeable point in the auditory spectrum.
     
  6. Brad_Porter

    Brad_Porter
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    Thanks for the answers guys.

    It is possible I suppose that the corner the speakers are in are causing 'peaks' which the test tone is not exagerating.

    My rear speakers are M&K Tri-Poles - is this going to cause and issue? What should I do to accomdate these?
     

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