I have an energy xl-s8 just bought a few months ago. It seems to make alot of noise. It's not port noise, but there is a buzzing type sound coming from the woofer itself, almost as if the foam surround was coming loose, but I checked it really good and nothing is ripped or loose. Do you think I am driving it to hard. I have the volume on the sub set to 9 out of 10 and on the receiver to -10, the lowest it will go, the room is 14'wide and completely open in the back behind the seating area probably about 35'. I bought this when I was in a smaller room and didn't notice the sound then, but I only had the volume on 8. I only really notice it on low bass scenes like the opening to 5th element and toy story 2, not noticeable on music.