Ok, I know car subs arent worth didley in the home theater application but I wanted to see how my basement reacts to a sub in the first place before I decided on a sub driver/enclosure design. SO, I had the neighbors kid, take his sub out of his truck and we hooked it up to an oscillator in my basement, approximately where I want to place my own sub. We set a SPL meter about a meter away and took readings. From 20Hz to 120 Hz. We got a fairly even increase from 75 db's to 100 db's with some peaks and dips here and there. I'll post the factuall #'s tommorow. His box has 2 10" drivers in it, if that makes any difference, and he has a sealed box, but its terribly constructed [I wont tell him that]. It sounded low but I thought that my b&w's went almost as low as his sub. My ? now is is this freq curve typical of subs? and how does it compare to ohers?