How to test sub pre out?

apc
apc Posts: 779
edited December 2012 in Electronics
I think my old AVR is not sending the sub a signal. I've tried a different cable and a different sub. Using a test DVD that sends sound to each of the 5.1 speakers.

Is it possible to test the sub pre out with an ohm meter? If so, what setting and what am I looking for?
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