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  1. #1
    Speaker noise with Mac?
    AdmiralSpock's Avatar
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    Dec 10, 2004
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    PowerMac 7200/75: Mac OS 7.6.1; iMac 233mhz Mac OS X 10.1.5; PowerBook 180c, Mac OS 7.5.3
    Speaker noise with Mac?
    At my church we use computers in our sound room to play music, do DVD's (or at least, I'm trying to make it that way), and do on-screen presentations such as sermon notes and music lyrics.

    Something I noticed, and we have been able to work around, is that when playing music on the computer, when nothing is going on, it makes an odd noise over the speakers. Like a medium-pitched mm-mm-mm-mm. I noticed that it did it with both a Windows laptop and a Windows tower.

    Has anyone used their Mac with a big sound system - perhaps not at a public place, but rather, your own h ome, where it has done this?

    If Mac's dont have that problem then I may look into getting a Mini to handle the DVD and music parts of the service.

    Thanks!

  2. #2
    Speaker noise with Mac?

    Member Since
    Mar 30, 2004
    Location
    USA
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    4,744
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    12" Apple PowerBook G4 (1.5GHz)
    Since you said it did this with two seperate machines, I'd suspect the problem is in the connector or cable you're using, or even the switcher or mixer in the church. Miniplug connections don't always provide the best quality.

  3. #3
    Speaker noise with Mac?
    AdmiralSpock's Avatar
    Member Since
    Dec 10, 2004
    Posts
    25
    Specs:
    PowerMac 7200/75: Mac OS 7.6.1; iMac 233mhz Mac OS X 10.1.5; PowerBook 180c, Mac OS 7.5.3
    Thing is, it never does this with the DVD player or the stereo. If it is a cable problem, then it would affect every device, right? And not just the computer?

  4. #4
    ibmac'n
    Guest
    Read this. See if it helps.
    http://g5support.com/group/viewtopic.php?t=154
    Good luck!

  5. #5
    Speaker noise with Mac?
    AdmiralSpock's Avatar
    Member Since
    Dec 10, 2004
    Posts
    25
    Specs:
    PowerMac 7200/75: Mac OS 7.6.1; iMac 233mhz Mac OS X 10.1.5; PowerBook 180c, Mac OS 7.5.3
    Well this morning's service was an absolute disaster.

    First thing which has nothing to do with this is, the CD I burnt that held the powerpoint presentation which was to be used during the service didn't want to be accessed by the other computers (this is all Windows machines).

    Then, the microphones in the church suddenly decide to stop working. This is all during the service. So I am back there trying to figure out how to get the Pastor a microphone, and the problem was that there were 2 computers hooked into the same plug as the sound board and such, which got that mm-mm-mm sound, and killed microphones (as they weren't getting power). I fixed it shortly after with another power strip powered by an extension cord going out to another room, and will use that solely for computers. I didn't get a chance to see if microphones functioned - but they most likely did since they don't have to share power with two computers. So - the mm-mm-mm sound and the microphone problem (unless it is a wiring problem) is eliminated.

    So, I'll probably look into a Mini for the sound room to handle what my laptop does.

    Thanks guys for your help

  6. #6
    Echo_
    Guest
    that mmm sound has nothing to do with os

  7. #7
    Speaker noise with Mac?
    AdmiralSpock's Avatar
    Member Since
    Dec 10, 2004
    Posts
    25
    Specs:
    PowerMac 7200/75: Mac OS 7.6.1; iMac 233mhz Mac OS X 10.1.5; PowerBook 180c, Mac OS 7.5.3
    that mmm sound has nothing to do with os
    Precisely.

    It was because the computers were hooked in the same place as the sound board and other important machines.

  8. #8
    Thud
    Guest
    The "mmm-mmmm" sound could have been any number of things. Big sound systems like that are very fickle. It was probably a ground loop somewhere.

    It has nothing to do with the computer or OS itself-- actually I'm not surprised that you heard some noise when you hook a 1/8" mini jack into a big sound system.

    If you want to use a computer for that kind of audio work, a tiny 1/8" stereo jack just isn't going to cut it. They're good for headphones but they're crap when you plug them into a large amp.

    You need an audio interface that preferably supports 1/4" balanced I/O. You can spend $100-$150 and get a good quality one for a windows machine, or you can buy a whole new Mac computer, but you'll still need the pro audio interface anyway because you'll have the exact same problem with the mac machine.

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