This may be dumb...but is there an easy way to hook up a sub-woofer to the stock 300 watt Bose amp?

Youcan hook up a sub and amp in addition to the Bose system but under no circumstances should you ever try to run a seperate sub off of the Bose amp. There isn't enough power (I don't care what Bose says), you can't cross it over seperately, and the Bose amp is designed to run at a certain impedence. Can't do it and have it sound worth a crap.