+1. (these things convert 12v DC to 110v AC curent)
Here's a few:
http://www.google.com/search?sourcei...Power+inverter
Just check your amps 110 volt power consumption ratings. (should say near your power cord/or in the manual)
Then just make sure the 12-volt/DC to 110-volt/AC power inverter's output rating is equal too or preferably a bit higher than your amps 110v-wattage power requirements.
(I'm not referring to your amps 150 watt power amp output here)
PS: Your cars battery will probably go dead after an hour or two unless you run the engine...