I just picked up a G4, 20", 1.25 to replace my G3, 333. I have the apple pro speakers which sound very nice but lack a subwoofer. I have lots of stereo equipment laying around which includes several powered subwoofers. I tried plugging the sub into the headphone jack and that worked but disconnected my apple pro speakers so all I had was "woof". I don't really want to buy a whole new set of speakers if I don't have to. Don't have enough room on my computer desk to hook it directly to my stereo system. Does anyone have a idea on how to do this install. I just need some thump!