<font color='#000000'>You could use them, however, by the time you purchase a nice well made ac to dc converter, of at least fifty amps, and a good battery for reserve power, you might as well have purchased a good used separate amplifier or a high powered receiver.
Also, Blaupunkt, in car audio circles, is not exactly known for making high powered well engineered amplifiers. If you really want to try this look at these well made, reliable amplifier brands: JL Audio, Xtant, Linear Power, Zapco, Precision Power, U.S. Amps, and Phoenix Gold to start.</font>