I need to replace my battery for my audio system I had bought one years ago at the marina because I was in a pinch not sure if it was the correct one to get since the one I got was a marine cranking battery.

So I guess my question is should I be getting a deep cycle marine batt or a marine cranking batt? The battery I had been using for audio was an interstate with 800 cold cranking amps 1000mca.
I'm only using factory speakers and 2 tower speakers and a sub with 2 amps.

Thank you