Question about Mackie Onyx Firewire Card
The firewire card is all digital and you can't rewire it to bias the pan pots.
You need to do further troubleshooting of this problem before doing any changes.
Wire the L and R lines into the card with a wye connector to guarantee the same signal as a first step. With the pan's at 12 o'clock what do the VU's in the computer show?
There are many possible causes so finding the root cause is important. With the L and R wyed into the inputs, if the VU sensed by the computer is much different (over 1 Db different, then the interface needs work. The problem is likely in the input circuitry and they may have gain pots available. One could damage one side of the inout circuits by improper use or overdriving the input. ALWAYS connect all interconnected electronics to the SAME power source. If power is taken from receptacles at the opposite ends of a room this invites damage due to common mode noise spikes.
From the BTW thing you included, it sounds to me like there is a gain mismatch in the front end of the card... HOWEVER I need the test with the wye cable as you MIGHT have a condition of either a vast difference in the driving impedance between the two sides OR an insidious thing you can't see like a suspesonic feedback that you can't hear but is disturbing the VU indicators.
Venturing a guess as to probable cause, I suspect that the input circuits of one side may be damaged by a static discharge. DO NOT count on the VU led's being accurate as they MAY be totally independent of the conversion hardware.
Another gotcha that can bite is if you are using XLR cables and one has a broken or miswired signal line. Again. the wye cable test will verify this.
Posted on Aug 25, 2010
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Posted on Jan 02, 2017
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