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I put cable from ch1 unbalance output to mic 1 XLR input
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A couple problems with this is that the mic amp provides very high gain (since a low output mic is usually feeding it), so the level may be hard to control.
The other problem is that there is 48volts DC phantomed on the XLR jack to provide voltage for a microphone. I suppose the line output stage is capacitively coupled, but it doesn't seem like a good practice to me.
I admit I don't know how to produce a cal file for this soundcard.
Perhaps John M has used one of these.. Any suggestions?
brucek