It's got 4 gauge running from the battery of my Honda Civic, and 4 ga. to the chassis from the battery. I've got the rear channels bridged running two JL 10W0's, and it gets egg-frying hot even with the back seat forward (it's mounted on the back). Is this normal? The front two channels are doing 50W each to Diamond Audio Motorsport components. The alternator is fine and so is the battery. Any thoughts?