Ok fellas im a proud new owner of a 2005 fastech 292 and im super excited about this boat. I went from a wakeboard boat to a powerboat and i miss not having the stereo loud enough to over power the engine sound. This fastech came with 2 rockford fosgate below the captain seats by the legs. M2 8 inch but im looking to add 2 more JL in the back by the sides above the cupholders. My question is has anyone tried to put 8;s there or JL makes 7.7 or am i going to have to settle for 6.5? Im wondering if there is enough depth for the speakers and how much. TY in advance

There's always under the rear seat. I thought about adding two more where you are considering but I felt like they might get damaged by clumsy people getting in and out using the step there. The only pain with where mine are mounted is I have to remove the speakers to get the batteries out. You should be able to measure the clearance back there via the gunwhale storage compartment

yeah i thought about adding two more next to the 2 tens i got under the bench but i dont want to compromise the sound plus like u said having to remove them everytime i need to get to the batteries. The JLs are 3.3inches deep