The BassJump-subwoofer is one of my favorite and most used gadgets for all kind of intel-MacBooks. It's driver-software basicly combines internal speakers with the USB-subwoofer. Sitting in front of a MacBookPro gives you a nice stereo-audio experience with that combination of internal speakers plus subwoofer. And the BassJump is easy to attach with no need for extra power-supply. Tonight I've tried to create a combined audio-device on my PowerBook, but I couldn't get internal speakers work together with the USB-attached BassJump. Since the BassJump alone did even sound better than the inbuild speakers of the PowerBook (pretty much like a normal speaker, after I started to fiddle with the iTunes-Equalizer) it's now an easy to attach external (mono) speaker for the PowerBook too. Maybe anyone could help to find out, how to combine the BassJump with the internal speakers to get some extra kind of stereo ?