Retina MacBook only using tweeters in Boot Camp

Discussion in 'MacBook Pro' started by Radiating, Dec 31, 2012.

  1. Radiating macrumors 65816

    Joined:
    Dec 29, 2011
    #1
    [​IMG]

    Simply put the Retina MacBook Pro 15" has a defectively coded speaker driver.

    In Windows 7 you can see that it has 4 channels, left, right, center and sub.

    Only the left and right work. The center and sub produce no sound.

    The end result of this is that the tweeters (upper speakers in the photo) are the only speakers that produce sound, and the sound coming from the speakers is complete garbage. The sound quality is really bad (even with equalization), the volume is abysmal, and sounds below 1000hz are not reproduced.

    This really sucks. Is there any way to possibly fix this and enable the mid-range speaker drivers in windows 7?
     
  2. bobcan macrumors 6502a

    bobcan

    Joined:
    Jan 8, 2007
    Location:
    Sunny but Cold.. Canada
    #2
    The same problem with Headphones..??

    I do not use Windows or Boot Camp with mine, but I am curious (as a Pro Audio Engineer) does the Headphone Jack reproduce sound full range, or is it 'frequency limited' as well..?? Even the cheap Apple ear-buds will produce a 100Hz Tone easily..

    Knowing that would at least tell you if it is a problem with the Amplifier/ Crossover Network for the Speakers, or if it is inherent to the Program/Software somehow.. or at least I think it should.. :confused:
     
  3. Radiating, Dec 31, 2012
    Last edited: Dec 31, 2012

    Radiating thread starter macrumors 65816

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    Dec 29, 2011
    #3
    The jack reproduced the full audio range without issue. Windows 7 running on parallels desktop AND vmware fusion through the OS-X environment both also reproduces the full audio range without issue, so the culprit is in the windows 7 bootcamp driver.
     
  4. lightz39 macrumors regular

    Joined:
    Nov 30, 2012
    #4
    I think someone posted about this earlier. If you change it to quadraphonic it fixes it? Maybe, I can't quite remember.
     
  5. Radiating thread starter macrumors 65816

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    Dec 29, 2011
    #5
    I've read that post, I haven't found anything that works though, and even when setting them to quadraphonic they don't seem to work.

    Here are some frequency sweeps you can use to test the problem, I can't hear anything half way through the 16hz-1600hz test.

    http://www.dr-lex.be/software/download/mp3sweeps-1f.zip
     
  6. Radiating thread starter macrumors 65816

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    Dec 29, 2011
    #6
    I found 3 other people that were having this issue so far. I'll start posting links to them.

    https://discussions.apple.com/thread/4592255?start=0&tstart=0

    Even if you enable quadraphonic and speaker fill it doesn't work properly, but it does make it better. In either situation sounds under 1khz can't be heard.

    When sending audio signals to the front speakers alone they are brighter than the rear speakers, BUT both still have a crossover around 1khz.

    Did Apple program the crossover for the mid range speakers backwards? It's hard to tell where the screw up is.
     
  7. mrbigglessworth macrumors member

    Joined:
    Dec 5, 2012
    #7
    On my bootcamp setup for Win7 the speakers were already set to Quad, setting to stereo did show that the sound quality was reduced quite a bit. I hadnt really used onboard speakers as Ive done all my gaming at home when hooked up via TosLink to my Logitech Z-5500s.

    Has this bug been submitted to Apple?
     
  8. Radiating thread starter macrumors 65816

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    Dec 29, 2011
    #8
    Whats the best way to submit the bug to Apple?
     
  9. KPOM macrumors G5

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    Oct 23, 2010
    #9

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