Decided to upgrade the sub/enclosure in my Ri237 to a ported system with WS REVO 12HP, what a difference! No longer does it sound like a speaker slapping in a panel.
Note the vertical port to the left of the woofer.
Before After
Combined with the six 8" in-boat speakers and four REV10s on the tower (powered by a WS SYN-DX6 and SYN DX2.3HP), it sounds great!