I really enjoyed my icon 12 ported and sealed. I ran it for about 2 years before switching vehicles. I thought it was well rounded and got loud. Ran it off a DD m1c
Should be about 54 across the backseat. 12 deep and average height is 7.5. I would recommend a seat lift to help with space.
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Look into getting a dsp and sound deadener materials. The f350 is loud so try to limit the external noise coming into the cab. You will need to amp the speakers as the non-Sony system is pretty weak.
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That means it is one piece of wood where the subs are mounted. It is not a box. You’d have to build the rest or fiberglass it
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