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Message: <blockquote data-quote="Eish" data-source="post: 1184428" data-attributes="member: 2900">Very odd problem.  Is it possible the two subs have different sensitivity settings?  Not knowing all your other settings I would methodically go through it this way:1. Check sub settings on the Denon (Sub vs Sub+mains)2. Test it at a higher volume - maybe it is working but too soft to hear.3. test the sub using a different source (other than the Denon) like your TV audio out for example.  4. Check that sub is not on "Auto" but on "On" - in case it is the auto-on switch that is faulty.5. Check ground loop - connect amp back plate to sub back plate with a wire - while this is unlikely - it's easy enough to do - so why not.6. Fiddle around with gain and frequency switches in case the fault is there and causes intermittent connection.If all doesn't work - then I would open it up and check the connection between the sub amp and the woofer and also test the woofer using a AAA battery (unplugged of course).</blockquote>