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kane - you answered your own Q

the .4 is for the cabin
the .2 is for the towers

if you want to add a sub, you'd either need to upgrade to a .5 and build a box or buy a pre-made enclosure...

Kane - take a look at the setup you have. You could add a small 10"sub if the cabin amplifier is a 5 channel amp and they just hooked up the cabin speakers to ch's 1-4. I doubt this is the case but,...