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Peter,
A free air sub means you dont need a speaker box to mount the speaker taking up loads of space. With any sub you really dont need to place it so you can see it, you can just mount it behind your seat panel (if there is room). The boot space forms the speaker box. Some subs need a designed box (certain volume) and can be ported (Vent pipe from box) into the cabin to give more natural sound, however with the cobra there is so much other noise you will just need something that thumps the foundations to give you the bass.
If you are interested I have a Free Air sub for sale it is a "soundstream 12" sub" I also have an amp to suit. I dont have a low frequency crossover but your radio may have provision for sub output anyway.
Let me know if you are interested.
TC
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