PA or MA audio?

MMM I prefer to run the red and yellow top.
Question- I am going to run a red top under the hood and yellow top in the back. It doesn't matter what size yellow top I get right? Since I am going to put it in the trunk.
use a 34 or 31 and make sure you get a battery isolator. SOmeone told me runing 2 different batteries requires the isolator as to not kill each other trying to regulate to the same voltage.

 
use a 34 or 31 and make sure you get a battery isolator. SOmeone told me runing 2 different batteries requires the isolator as to not kill each other trying to regulate to the same voltage.
Thought I needed to add some thing to the two but I wasn't sure because everybody I have spoken to that has two batteries never brought no isolator up. It is required, correct?
 
Thought I needed to add some thing to the two but I wasn't sure because everybody I have spoken to that has two batteries never brought no isolator up. It is required, correct?

it's not required but could be usefull. both batteries will charge without an isolator, but they won't be isolated.

 
but it still isn't required. i would recommend one however, because both batteries can fight with each other and drain each other.
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