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1/8" mono miniplug to RCA phono plug
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The cable to do a soundcard calibration will be different than the cable used with the SPL meter.
The soundcards line-in and line-out are usually stereo. So you need to 'break out' this signal into its left and right channels before connecting the line-out to line-in.
This requires an adapter such as these:
Depending on the adapter used, you require a different cable.
For the SPL meter, you require an RCA from the Radio Shack meter. Then the adapter determines the other end of that cable.
brucek