![]() Play back a 60 Hz tone and measure the level. On a normal audio jack, the tip is L, the ring is R, and the sleeve is ground. Measure the voltage between the left (or right) side and ground. ![]() You can make a 60 Hz tone and play it back in something like Audacity, a free program. Most cheap multimeters, even the $5 ones, usually have little issues with measuring 60Hz stuff. Plug in a 3.5mm cable to the output to make it easier, turn all volume to 100% and play a 0 dBFS (max volume) 60 Hz sine wave. I don't expect you (well you in 's easy and it would be helpful for everybody to include this info) to do this, but for reference: ![]()
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