JKF has some good advice above. I would also add my experience with the larger PSW12, which also has port noise, that one consider running the sub perpendicular to the F/C/R speakers. At right angles and with the volume at 12 o'clock or less the port is virtually unnoticeable. There is something about facing the sub directly at you with the grill on it and running it at moderate to loud volumes that just invites turbulence into your room! This could probably be "corrected" by some modification of the PORT that Polk does not seem to want to bother with? I understand that as this sub is not a money maker. It can be regularly found for 89.95 or less. The margins are practically non-existent and a manufacturing tweak might make the margins even smaller?