ok, well heres the deal. i bought a box offline from hi fi and it was for the L7 and it didnt fit. it was a 12 inch box but the hole was a cut a bit to small. i had to do a little trimming. now when i put my sub in i have to push it down into the hole cuz its a tight squeeze and pry at it to get it out. now im getting a noise that sounds very much little vibration. plus the wood stripped out so the screws dont tighten down. could this combo cause a weird vibrating sound? i checked my ground and all that good stuff. so, could it be?