Hi Tablejockey - thanks for your post and compliment. My second Rythmik F15 sub is on the right side wall near my sitting position. The corners are taken up with bass trapping so alternative placements had to be found using a Dayton OmniMic and test tones to "shoot the room" for best placement.
For what it's worth, if you do decide to get the Adante FS-61 speakers, I'd recommend a Parasound amp as their high current does a great job of controlling the speaker drivers (I guess any high current amp would). ...Cheers