A few weeks ago I purchased a Yamaha HTR-6130 receiver and a Boston Acoustics HPS120 subwoofer. I had to put my ear to the grill of the subwoofer to hear the rumbling in it. Indeed it was the HD concert channel I had on. Yamaha tech support took me through all setup possibilities, including raising the volume setting in the receiver to the maximum for the subwoofer, to no avail. I pulled out an old Philips receiver and the new subwoofer worked fine. I attached my old Philips subwoofer to the new Yamaha and it was the same quietly muffled result. Tech guy had me run the subwoofer line into the "left" port on the subwoofer rather than the LFE. Not much difference. So I shipped it back and got another from another vendor, Amazon, which unlike the first is kosher for Yamaha warranties. Same problem, same help from Yamaha tech, same details. So, knowing that life sometimes throws us odd stuff, I shipped that one back for a replacement from Amazon. Set up the third new receiver today. Same old, same old. Yamaha tech guy suggested buying another model receiver. I am tired of packing and unpacking and traipsing to the UPS dropoff. Embarrassed, too, at putting perfectly good vendors through all this along with me. Again, the new subwoofer and the old subwoofer work fine with another receiver. Anybody got ideas for making this one work.