Cal: I have 2 12W-7's shooting into Open air and 2 More 12 W-7s shooting into the hull. #1 I can flex the hell out of the side of my boat from the Bass SPL comming of the sub's. Im not trying to brag. My boat is solid as hell in the aera Im talking about
Passenger side just below the window on the hull.
The 2 12's shooting agianst the hull shakes or moves the side of my boat so much that I know it can be good for it. Plus the added vibration that comes off the hull shake the rest of the boat neadlessly. My tower reverbrates bass. Simply placing your hand on the flat bar section quites it down but I think you get the point. My boat is a extreem example of the point Im trying to make. 1 10 inch sub is not gonna do much but 1 or 2 W-7 13's and your gonna start moving things around.
IMO the bass want to be "free" so don't trap it or try to make your system louder by bouncing bass waves off of things that rattle or can move around your boats gonna pay the ultimate price eventually. The sub box that sits at my feet(drivers side) has 2 12's The bass wave comes right off that box and bounces into who or what ever is sitting in that seet and it sounds and feels so Awesome. IMO the Bass is more accurate and clean because it not bouncing off of anything and picking up the vibration from what its bouncing off of. Yes you loose lots of SPL shooting in to open air the Bass seems to some how evaporate because it dosen't have anything to bounce off of. "Welcome to boating" and boat system's. My cure for this problem. More sub's more Amps more battery's MORE BASS. Not the answer your looking for but its the truth. Yes there's other way's of doing it ask around everyone will tell you somthing diffrent. Search around till you hear somthing that your wallet agrees with and pull the trigger.
I think that the 13 W-7 is one of the most beautiful sounding sub's I have ever heard. What makes that thing hump is POWER. Somthing north of 1300-1500 watts. If you can keep amp's that will provide 1300 to 1500 watts of power fed with 12 volt love Juice you can make that sucker BOUNCE "god bless america"
WOW all thins talk of Bouncing W-7's has me excited of Summer.