I have a new Polk Audio DXI 124 SVC 12 Inch Subwoofer . In the original box never installed. I also have a screen for it new from Amazon.

I would like to trade for a 10" Free Air Sub of similar quality. Let me know if you are interested. Its going in a boat so marine rated would be nice. The existing hole is 10" in the boat and I prefer not to have to open it any more.