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Battery Isolator for a second battery install?

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Is it important to have a battery isolator when installing a second battery?

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I would say no.

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Depends if you plan on playing with your car off or no, so yes it would be important to have if you play your system with the car off.

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I would use one one a boat.

 

I never listen to loud music in a car without it running because of voltage drop. 

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Thank you for the read...so i take it an Isolator will not be necessary, where in the configuration with two battery's would be the best place for my 175 farad and 1 farad caps? in between or after both batteries?

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^Never mind on that last question, I'll put the caps between the last battery and amp.

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caps, like batteries, are wired in parallel so it doesn't really matter. 

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