Car Battery/Alternator versus draw from Speaker/Sub Amps?

lol ... you forgot to say what kind of car it is ... well most cars would be ok with those 2 amplifiers . you will be using about 80 amps at full volume for the amplifiers . Most cars these days have a 110A alternator. It should be ok if yours is 110A+ . you may have a little dimming of lights at night . If you have a car with a 90A alternator ..... you prob wanna buy a second battery, high amp relay (they make a 80A version ) , and a second fuse to put near the second battery . hope that helps .