Posted on Sep 11, 2011 09:34 pm
jdickens
Member Since: Sep 11, 2011
I'm sitting here trying to figure out a buzz problem. I've torn down my setup to bare minimum with the buzz still present. I would assume this should be easy to fix.
Right now, the only items in the situation are:
MacBook Pro - Not plugged into power supply. Running on battery power.
Apogee Duet w/ a Balanced Breakout Box.
The appropriate 15-pin connector to connect my Breakout Box to my Duet.
The FireWire cable connecting my Duet and my MacBook.
A pair of Beyerdynamic DT770 headphones.
A Mogami cable running from my Balanced Breakout Box to my Schecter Hellraiser 7. It has active pickups.
I've tried switching to other high quality cables. No change to the buzz issue.
I've trying using different guitars with passive pickups. No change to the buzz issue.
The buzz is only there when a guitar is plugged into the Duet. I can have my inputs on with nothing plugged in, and I do not get a buzz.
I can move the guitar around the room and affect the level of the buzz, but I can't get it to go away.
So just to reiterate, I have nothing plugged into a power outlet. my Macbook is running on battery power, powering my Apogee Duet which the I/Os are run through a Balanced Breakout Box. I'm not even hearing the signal through the outputs on the Breakout Box. I have my headphones plugged into the headphone jack on the Duet itself. Even If I unplug the headphones, I can see on the fader that the buzz is still there. I'm using a Mogami cable to plug in my Schecter Hellraiser. The buzz is there only when the guitar is plugged in.
I can see the Output fader in Logic showing the low level noise signal that is coming through. I even found that the buzz is coming primarily through 2250 Hz. I recording the track without playing anything, and the buzz was in the recorded track.
This is all tested on a dry signal.
I'm looking for insight as to the cure of this buzz.
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