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I ended up doing the calibrations using only the loopback cable and when I was ready to run a measurement, I unplugged the loopback cable, plugged in the SLP into the Line-in and ran the measurment. I assume the Y adapter is just a convenience factor right?
Can you expand on this statement - just want to be sure that you're not on the wrong page. Let me first explain the loopback cable.

The loopback cable is installed only to produce a soundcard calibration file. It is placed on the right channel and the soundcard cal routine is run and the file saved. The loopback is removed and that right channel is now calibrated. The SPL meter is plugged into the right channel line-in and the output of the right channel line-out goes to your system and a measurement is taken. The left channel is never used. The Y adapters are used when the line jacks are stereo and need to be 'broken-out' to right and left.

brucek
 
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