Since I had a HR20-100 DVR installed, my subwoofer makes a booming sound whenever there is a channel change or the satellite is turned off or on. Had the subwoofer checked and it is good. Took my HR20 700 DVR from the bedroom and put it in place of my 100 and had the same problem. Did not have this probem with the H20. Have had one Tech and two electronic store people look at it with no solution. Anyone else with a similar problem or a suggestion? Equipment: Pioneer Elite PRO 800 Plasma -YamahaRXA 640 Receiver - Definitive Technology PC60 Speakers - Monster Power AVS 2000 Voltage Stabilizer - Monster Power HT UPS 1000 - Monster Power HTS 3600 Power Center - Denon DVD 2200.