Sounds like a low signal from the Yamaha. Try a couple of things. In the speaker setup, Yamaha gives you three sub options: off/sub alone/sub+mains. Try the sub alone, and then sub+mains to see if there is an appreciable difference between the two. Also, I believe you can attenuate the signal to the sub (in speaker setup), so be sure that the signal out from the Yamaha hasn't been cut. Otherwise, try another cable from the receiver to the sub. I am not familiar with the HPS500, but I would guess that there are dual line in RCA's as well as an LFE input. You may try different input jacks to see if that helps. If all else fails, but a Sunfire True Sub. That mother will shake for sure! Cheers, Steve.
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