salt-water-Fly

Me three. beautiful new sub. Probably have less than 10 hours total listening time on this beast and ... it won't produce sound. The LED is lit, but no sounds come out. Oh wait, it started working and then ... it quit. Just trying to check it with my Denon speaker setup routine "test tone" ... all other speakers work. Sub did not. Tried swiching RCA cable and ... it started working! Then a few minutes later is stopped. (I was trying to figure out if I should have the cable plugged into R or L/LFE. It was working, momentarily, when plugged into R. When I switched it (later) to L, I got no sound. So I switched it back to R and ... no sound there either, now. This stinks.