I've done my search on this and couldn't quite find what I was looking for. A few short questions. The sub is a 6" sub from screw hole to screw hole. Would that be considered as a mid-sub? Also if I drop a different 6" and a new amp in the oem box would it sound bad? I don't want to spend a lot of money but the sub that's in there now has no punch what so ever. I also don't want a bunch of bass but something that hits tight and makes the system sound a little better. Thanks