Question about Apple Power Mac G5 Desktop

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External sound problems on Power Mac G5

When using external audio (firewire, usb audio device) the sound is echoed and useless, BUT using internal audio everything sounds fine.

Can you help me?

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  • sonorafx Dec 28, 2008

    I have a TASCAM US122 mixer (USB) and a JVC miniDV cassette deck (firewire).

    On both devices the sound is useless using SystemPrefs>Sound>Output, only internal audio works fine.

    The OUTPUT is echoed and I use FCP studio but I noticed that even quickime and itunes doesn't work with external audio.

    I re-install drivers, check the devices on other machines (no problem) but I don't know what is happening.

    The problem appears about a week I upgrade my system from 10.4 to 10.5x.

  • sonorafx Dec 29, 2008

    You're right, I have the G5 then the Tascam then an Amp with speakers, in fact, it's an old RCA Home Theater on which I have connected the Tascam (Tape) the MiniDV (VCR) and the G5 speaker out (CD). If I switch to one of those inputs (except CD) the sound is echoed.

    It's wierd because I always have that setup, as I told you just a week before the upgrade to leopard that thing happens. It's not only the Tascam but the deck.

    PS. English is not my native languaje so please forgive me If I'm not as clear as you may wish :)

  • sonorafx Dec 29, 2008

    By the way THANK YOU VERY MUCH for your interest

  • sonorafx Dec 31, 2008

    Yes I did the update right after the installation of leopard and everything works fine, the problem appear suddenly, on both firewire and usb devices.

  • gpmnn Jan 18, 2009

    Yes I have the same problem in my G5 Mac the output speaker will be noicy when i connect earphone. why is that reason

  • Sean Cole
    Sean Cole May 11, 2010

    Hi again,

    So did you use the updated drivers from the tascam site?


  • Sean Cole
    Sean Cole May 11, 2010

    Hi Sonorafx again,

    I'm going to assume that you've already downloaded the latest 3.40 drivers for the US122 available from here:
    This is essential for OSX10.5

    I need to clarify a bit more with you:

    • Your setup is G5 via usb to the tascam then using the output from the Tascam via line out to your amp and speakers

    • You've tried with both the 'Direct' switch on and off

    • In the SystemPrefs>Sound>Output and Input settings it should display the TASCAM US122 in both lists

    • Because an echo is nothing more than a digital or analogue delayed feedback loop, make sure that all inputs are disconnected and that the input levels in the systemPrefs are set as low as possible. See if that makes any difference.
    I look forward to hearing back from you.

    All the best

  • Sean Cole
    Sean Cole May 11, 2010

    Hi Sonorafx,

    Can you go to SystemPrefs>Sound>Output and let us know what the list of devices are with one of your Firewire or USB devices are connected. Also knowing which devices you are trying to connect is useful. Is it the input or output that is echoing? What other software are you running at the time?

    Many thanks



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Mac g5 sound output is echoing? what is the reason

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