Thanks for that link Sasha.

According to that test file, I'll put all my gear up for sale in the morning :(

Wasn't that fun? I hear from about 25hz to 17.5khz, which is very normal. Usually, lower than 25hz could be felt through the subwoofer, but I doubt someone human could hear it. Sell your gear to a flock of bats lol

I did hearing tests when I was younger, and was told my hearing is very acute (IE. better than normal). I can hear somewhere under 25 Hz, probably 22-24, and slightly higher than 20kHz, though less 21kHz. On top of that my hearing "range" is pretty good too. For example, my room is roughly 40 feet from the nearest T.V that isn't mine, and if mine is off and the other one is on and muted, I can "hear" the humming noise that most TV's make when they're on. It's actually quite annoying sometimes :S

edit lol!
What kind of music do you listen to that it digs into the subsonic range(20hz and lower)

I'm guessing that's for me? I couldn't tell you even if my music was going under the 20 Hz, since the subsonic filter on my amp cuts anything below 20. Besides that, like I said I can only hear like 22 Hz+, which is probably good. I'm sure if I could hear below 20 Hz, I'd be some government test freak by now :P

1- you could be sitting in a cancellation node, 2- your LF hearing is not so good, 3- the car could be eating the note, 4- the sub/box may not be doing that good of a job

one issue is output level, put the car on a termlab or AQ meter at say 120db to 130db and do test tones to plot response (this will address 3 and 4) (if you put it at the head rest you will address 1)

yes the longer the wavelength the farther it should be heard so if you cant hear it in the car it could be 2 (not hearing below 50 Hz isnt that odd)

I MAY have heard something around 12khz (at least thats my story and I'm sticking to it). I've tried a hearing aid, but I hate them. A gust of wind sounds like a freight train going through a tunnel.

Flock of bats is a good idea, maybe the ex COULD use some gear...