Ok, I've got a 12" Acoustic Profiles sub, and yes, you probably haven't heard of them.  My dad bought it about 8 years ago, and about a year after we moved into our current house (been here about 6 years) the fuse blew, and it hasn't been used since.  I asked him if i could have it if i fixed it and he said yeah.  So its my mission to fix it.  I removed the plate amp from the back to take a look at the fuse.  It looks blown to me 

.  Just below it, printed on the PCB it says 0.6A 250VAC.  I have absolutely no idea which fuse to buy.  Also, on the back, it says 120V-60HZ 0.6A.  Would you guys be able to point me in the right direction?