I found a Logitech Z-640 (5.1 speaker system, yes, I know it's consumer grade) today and am wondering if there is any way to run it at 12VDC. I want to be able to run it off a 12V 33AH lead acid batteries I pulled from an old UPS. Is there a way to do this without completely destroying it? I considered running it from an inverter but the efficiency kind of puts me off. Thanks.