Actually, I was talking of using the s.e.x. into the FF4, not F5 -- the F4 is a impedance converting/buffer amp meant for current gain only and thus can be driven from the output of a SET amp -- the F5 is not really ideal for this unless you convert the s.e.x. to be s preamp.
Greg is right about the cube dimensions, and I agree with the idea of small monitors and one or two small subs -- that's what I use, more or less with the Nagas and BUF subs.
And actually, OB subs may be your best bet here. I know John (InfoernoSTI) had a room this same size and used some large OBs in it to good success. The OB subs just don't seem to load the room the same way sealed or ported ones do.
I'd also like to add that it is very easy to overtreat a small room -- as I discovered, there is a point beyond which the room just becomes dead and there may stilll be low frequency nodes to deal with, so long term you should probably be looking for a mix of absorbtion/reflection con trol and diffusion. For my diffusion I have most of the front wall covered with a 4' x 6' heavy, coarse weave wool/cotton/jute rug/wallhanging that is spaced about an inch off the wall -- this and the wall/cieling seam and tri-corner treatments make the biggest difference, but the 3 GIK 244 panels in the front corners and the wall behind the equipment rack ( to the left of the couch) do a good job of controlling the bass nodes. Then there are 2 GIK 242 panels on the first reflection points, and a carpeted floor and that's it. Of course not everything is optimally placed but I just had to work around what I had and the results are quite good so far, with maybe some fine tuning down the road if I feel I need it. BTW, the only speakers that I had that really overloaded this room were my old Cornwalls, but those are long gone now, but I was getting close to overload with a pair of speakers with 8 inch bass/mid drivers. I think 6 inches would be about right (if it were a single speaker), but so far, the pair of 3" drivers and the pair of 6" subs seem to do the job very nicely.
-- Jim
Jim Rebman -- recovering audiophile
Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).
s.e.x. 2.1 under construction. Want list: Stereomour II
All ICs homemade (speaker and power next)