I recently bought my home theater setup after weeks of research. So far I have the energy take classic 5.0 speaker system and a Yamaha RX-V365 receiver (can't complain since I bought it for 60 bucks new). I was originally going to buy a BIC F12 sub but I was running very low on funds thanks to all the textbooks I had to buy this semester. I ended up buying a Dayton SUB-80 subwoofer from audioholics.com. At first I had to physically play with the subwoofer cable I bought from monoprice because it was very inconsistent (from a very loud hum to no sound at all). I was not happy with the sound when it did worked and I thought it was because the cable was defective...so today I bought a overpriced monster subwoofer cable and hooked it up. The sound is now consistent but again I am not happy at all. This is my first real subwoofer but I have owned 3 logitech computer speaker systems with a subwoofer, one of them costing me 30 bucks and they all had a way better subwoofer. Hell, even my M-audio AV 40s can handle bass better than the sub. I know sound is subjective but for example, the subwoofer sounds alright at around -25 db but once I start raising the volume to around -15 db, I can hear it rattle and its not impressive at all. With my 30 dollar logitech system, I would blast music and the tiny subwoofer would handle it perfectly fine. I have tried playing with the crossover settings and settings on the receiver but it just sounds horrible no matter what I do. Do you think the subwoofer is defective? I want to return it either way and get a better sub but I want to know if its defective before I start the return process.