yeah you are gonna run out of power on the inverter , they are designed to run like a laptop or a drill charger , things like that , home sub amps pull a few amps and the inverter unless you get a huge nasty one like 1500 watts you would be able to buy a cheap 2 CHANNEL amp , key thing is home subs are 8 ohm car subs are mostly 4 ohm impedence , you could make it work if you had 2 channel amp probably 600 - 800 watts would work