We are looking at doing a budget stereo upgrade. Looking at possibly buying a Kicker ZX 700.5 off Ian on the forum. We currently just have the 4 inboat kicker speakers with no amp.

Looking to add the amp and a sub.

First of all - Will a second battery be absolutely required for this setup? (We are thinking that we will add another battery anyway as we like to sit with the boat off on the water and listen to music)

Second - What/If any materials or extra equipment will we have to purchase to connect speakers to the amp/head unit

Third - Opinions on subs, Looking at the KM10 subbox, only curious to how that mounts or buying a KM10 and then creating a custom box (no experience doing this) If anyone has any used subs for sale that might work for us I would definitely be interested for the right price