Does it have the barrel plug with a smaller center pin? I thought I read somewhere that this adapter required the pure-sine wave inverter.

I've powered other laptops with my inverter. The only problem I ran into there was while running audio through the aux input on the empeg, I got a lot of static while plugged in. The sound was perfect while running off battery though. Do you think this could be caused by a cheap inverter? Would a pure-sine inverter fix this too? Would just a DC->DC adapter fix this?