If they don't have their own power cords they are passive woofer and you would need an amp.
If they have a power cord the amp would probably not work on the 12v dc in your car without an inverter.
If they don't have their own power cords they are passive woofer and you would need an amp.
If they have a power cord the amp would probably not work on the 12v dc in your car without an inverter.