I have 4 kicker 6.5s and 2 horn drivers on the tower will have 2 pair kicker 6.5 coaxial in boat 1 pair up front 1 pair in rear. The question is what sub will do well in the boat. The sub will be under the bow or hood. I have 21” wide and 2’ long to work with. But the enclosure will have to built in the bow. Not much room to slip it in. Just giving all info you may need. I have a couple different amps to power subs and all high/mid range. I have a planet audio(old school) zed made 702 6 channel and a punch 360a2, a Ed 9.5 also have old school Lanzar optidrive 2200 looking for best option 10 or 12 no bigger. Thanks