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Equipment: Toshiba laptop running Vista. Creative Labs usb external soundcard. Radio Shack SPL.

Connections: Left out to amp. Right out to right mic in. SPL out to left mic in. I could calibrate soundcard and SPL meter.

Followed Creative labs and Vista in help for setup.

First graph is attempt. Second graph is soundcard calibration. I tried reversing my inputs but that did not work. Thanks.
 

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Disregard. I had the input set to mic not line. Now I can't get the out and in levels to match. Let me play with this some more.
 

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You only need to connect one channel. For the loopback, right out to right line in. For measurements right out to receiver or amp, SPL meter to right line in.
 
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