ARTA - dual channel measurement

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Hello,

Something is not right with this dual channel thing. I have a mic ECM-8000 connected to the left input and the left output directly connected to the right input. The sound card is an ART USB DualPre. After much struggling I managed to calibrate the sound card in ARTA although the instructions are far from being clear.

In green the measurement with dual channel and in blue with single channel (right input disconnected):

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Not only are the curves much different, specially below 3KHz but they are also offset by 10dB or so.

I'm using the following settings and gate:

An externally hosted image should be here but it was not working when we last tested it.

I know this level looks very low but I can't increase it or the peak meters latter will go to the red:
An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

I press Record...
An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.


Can anyone please tell me what I'm doing wrong?
Thank you.
 
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