I was lookin to install my empeg on to my motorbike. Apparently vibration isn't an issue, but mounting position is difficult, either face up in a pannier (which i've been told is a no no) or horizontal under the seat. Would still need to find some form of amp to power the headphones, and some form of remote control. Anyway, too manys problems and not enough time so the project's bee shelved for the time being.

Anyway preasure;
1000ft = 304.8m
preasure at 304.8m = 30.48 bar + 1bar for atmospheric preasure.
so preasure would be 31.48 bar or 456.47 Psi (if you like it in old numbers)