Sorry, those speakers can only be used on a Cube. In fact, they were made to only work with the Cube and nothing else. They require higher power than conventional USB can provide. So even if you got the power to them, you would need to make sure the USB Audio driver could work with it.
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MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop