Well, I have my yami right adjacent to my listening chair so that the port is aimed toward my chair and is about 24" away. It made a very noticable difference with movies. The overal dB didn't seem to change much but the close proximity of the second sub gave a great "feel" to explosions and whatnot...However, it seems to make music sound rather unbalanced so I turn it off for that and just run my main sub att he front of the room.
Brett