Question about Digidesign MBox 2 Mini (USB, includes ProTools LE software) 9900-55898-00 Volume License for PC, Mac

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Multiple audio noises even when mixer faders are down

Hi from Keith. My MBox 2 Mini does weird things to my gear! I use a Toshiba Satellite Pro laptop, which connects via USB to the MBox. MBox stereo analog outputs in the back go to a Behringer mixer. Laptop internal audio goes to the same mixer on two different channels - I have also tried sending the laptop audio to a separate Yamaha mixer which has the Behringer as a sub. Problem: loud splutter and pops, a steady whine at 1,000Hz, another steady whine (occasionally) at about 1,400Hz. Sometimes the whines are not there, then they start for no reason even when the equipment is not in use but just idling. It is not mains "ripple", which occurs at set times and goes away after a while - these two whines can stay for hours. Now, the plot thickens here. The sputtering comes through both the computer audio AND the MBox audio. Turning down the comp audio or the MBox audio just lessens the noise. What's more, the sputtering and the 1,000Hz whine SOMETIMES gets softer when I turn UP the left computer audio to about mid-way, but that increases the other whine - and with the MBox channels down or muted the whine and sometimes the sputtering gets louder - and that's with the computer audio actually unplugged! When I unplug the MBox leads from the mixer, the whines and sputtering in the computer audio stop. When I unplug the USB, the whines and sputtering in the computer audio stop. I have new leads, all mains power comes from a single power point, and I've tried other audio leads. Also, I cannot get analog audio into the MBox through the right-hand stereo jack, on any button setting, but the XLR works fine. Oh, one other thing. The system crackles a little a bit when I move the USB connector in the computer. Phew! Any help? Thanks!

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  • lionheart01 Mar 13, 2010

    I have another solution for my own problem! I installed an isolating
    transformer ahead of my main power buss into the control room - NOISE
    GONE! Looks like earthing was the problem indeed. My studio is on
    reclaimed land and there might be a mians earth problem. Thanks guys,
    you are awesome! :-)

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Dude, invest (very good investment for use of DAW) in an apple computer and go to ramjet.com and add additional RAM and you will have absolutely no more problems to ask help again!

Posted on Sep 09, 2009

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100% raidiation problem!
it was wid my denon protech also,
see if earthing is correct for all gears,
try keeping an equidistance of 10"inches between each gadets

Posted on Jul 16, 2009

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Posted on Jan 02, 2017

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