What Is The Power Of An 8 Inch Dobsonian Reflector What Car Amplifier Should I Buy To Power My DVC Subwoofers?

What car amplifier should I buy to power my DVC subwoofers? - what is the power of an 8 inch dobsonian reflector

I need two powers 8 "Polk Audio subs. RMS power is 180 each. 4 U-boats are Ohm DVC. I have a two-channel amplifier to power them. When the bridge 2-channel amplifier if the RMS power of 360 watts or less at 4 ohms?. I thought the underwater cable in a series outside the amp. Am I right with the power if the amplifier?