When I first assembled the subwoofer for my 4Runner I hooked it up in my house using a 900 watt car audio amplifier and a 300 watt computer supply. I was amazed at how great it actually sounded. If the volume was up too much it would shut the power supply down on low notes, but it was the most bass that I've had in my house.
Obviously, a subwoofer is a completely different animal than a set of Maggie's so I couldn't predict what results you might have. If you already have the stuff to test it out then go for it (unless someone can give you a reason why it could damage your speakers), but if you have to make a purchase then go with home audio equipment for the best results.