Not to thread jack. But how could you tell if a sub is bottoming out, would it make a bit of a slap sound? When my sub hits really low it seems to make a weird noise, which I have been told is normal, but I'm thinking the stereo shop might want me to blow it and buy a new sub from them. Its also in a sealed box.
good question, i don't mind at all! i was wondering that too after you asked it. lol