I just built a 95L vented box with a 12" Shiva downfiring and Rythmik 350 amp. I am not sure but I think I may have damaged the speaker or amp. After playing some heavy bass it started making a crackling/buzzing sound that is especially noticable when the sub is not actively playing. The gain is at 12 o'clock and the level from the RX-V1500 receiver is about midpoint. I had also reconnected the sub cable without turning the power off, which I now understand is a bad idea. I had been playing a song called "Gangsta Bounce" which someone recommended and it must get down to around 25-30hz and was at 108db at 10 feet. Not my kind of music but I was just trying to test the sub. The room is about 40'x25' with 10ft. ceilings. I did put the sub in the corner and it seems to work best there. Also, I bought a splitter so that i am feeding the left and right input jacks on the amp. I did notice a significant increase.