"Reply i know most of you say to use an isolator and then there are a few who just use a switch. from what i have read so far is that the switch is the cheaper way to go but the isolator is easier and better. i am planning on getting 2 optima yellow tops to run my system. i have a pair of B530's and the 4 speakers and 1 sub in my boat. i also the boss 5 light bar, but never use it. using my phoenix" . . . .