I have a Velodyne CHT-12, which I really enjoy in my smallish 11'x14' listening room. The problem is that somtimes the port noise can be audible in scenes which have very deep bass. Running test tones, i don't hear port noise until i get to about 23 Hz or so (which makes sense, since that is below the tuning frequency). The sub will play below 25Hz but with the thud of air coming out of the port.
Is it possible to supress this at all with some sort of damping material? If so, how would this affect the overall sound or response? Thanks!