yea must have been the bus itself vibrating or something
i have 2 12 inch hifonics and an ma audio 1286i at 1000 watts i set off alarms all the time.. all ya have to do is rattle the glass a bit

<a href="www.pittsfieldcustomsclub.com/sportage.html" target="_blank">98 sportage</a>: warn manual hubs,upyourkia spacers, 104 tj springs, 235/75/r15 BFG T/A KO, tracker rims, cone air filter, custom cat-back with a skunk2 muffler. gonna be a 2.3L