I have a fairly new Sony SA-WM40 sub attached to a Kenwood VR-6050 receiver and have been experiencing a loud (very annoying) popping noise during movies. Cable movies mostly (HBO,etc.). My guess is line surge. Right now my system is plugged into two inexpensive six plug powerstrips. Do I need a line conditioner? I know Monster Power has them from $200 to $1500. I can't afford them, I just know thew make them. Any suggestions for a newbie in this wonderful world of techno gagetry?