Installed my new SA 12s, and they are nice, however i noticed that when i turn my HU to around 28 (usually i would around 32) there was this squeak coming from the box or subs. I unscrewed my subs and made new holes for them since 3 or them didnt before, and it helped a little, but one screw always viberates loose. Im wondering if something else might be causeing this, maybe that its just a new sub or something? i turned the gain down and that didnt help, and as soon as i turn it to say 27, its fine. ANy guidance?