I've had the Pioneer VSX 820 powering a Polk PSW10 for about 5 years now with no problems. I bought my brother's Polk PSW110 sub last week and it will not work on this receiver. I thought he sold me a bad sub so I went out in the garage and hooked it up to my old Philips receiver. Quiet but still plenty of bass. I then went over to my bros house and hooked it up to his Sony receiver. Again quiet but still bassy. I have no idea what I'm doing wrong.Should be plug and play considering I'm just replacing a very similar model. I've messed with the calibration, lfe, and speaker settings to no avail. Instead of bass noise it just makes a faint crackle sound. I've also replaced the sub cable in the process. Any help would be appreciated.