Hi all!I don't have my UFO yet,but in the meantime I've been trying to improve my 16' x 17' room as best I can. I've added GIK panels floor to ceiling in each corner,one on the (wooden!) ceiling, three on the front wall that cover a large window. The corners where ceiling and walls meet plus the front wall panels affected the largest positive change. The boom when the 70ish hz wave smacked the walls is gone:-)
Recently I've been experimenting with how to reduce the wooden floor vibrations.My speakers are Zu Omen Defs which are bottom ported and I have three subs.
First I tried Primacoustics recoil platforms under the ZUs and what a difference! I was hoping to tighten the bass some,which definitely happened along with excellent clarity and instrument separation. I was so happy with the outcome I started trying different things under the subs with very different results depending on the various products tried.
1.Vibeboss (1 1/2"foam,mdf,neoprene) two under a sub so all four feet could rest on top resulted in a horrible glare, even under just one sub.Nope. Just one flat against the bottom in between the feet was better.... less glare but the vocals were all "gritty" and overly textured,but I liked that the bass had more bite.
2. IsoAcoustics Apertas 200 speaker stands that I had stashed away in the closet. Under one sub,pretty good. Under two subs a definite yes!Smooooth but now not enough texture. I played some Joe Cocker and the touch of rawness in his voice was missing. Beautiful but incorrect.
3.After fooling with several footers from the junk box and a Vibeboss under sub #3 I was 99% happy to leave #3 on it's regular feet on the floor. Then I stole the walnut butcher block from under the CDP and along with IsoAcoustics mini pucks under the block I'm finally DONE. There's no glare from brass instruments, flute,harmonica,Shawn Colvin.Joe Cocker and Leonard Cohen are spot on.Plucked and bowed bass are too.
So I ended up using things I already had.

Getting the ratio of equipment weight to the correct amount of density and bounce underneath was interesting though.If I bought the Apertas, mini pucks,and butcher block today it would have been around $600.The Primacoustics were $299 apiece and were the biggest bang for the buck.The platforms were $29 apiece but they're all returned now.
Last night I was listening to Rain Crow - Tony Joe White, the last song Tell me a Swamp Story.It has a very cool atmospheric vibe and I was startled by a burst of low maniacal laughter that used to be just a rumble (before the sub treatments).I jumped, my dog jumped and began looking for the stranger.To me that was worth every penny.But depending on an individual's room and floor I'll bet much improvement could be achieved with things around the house.Different wood, patio stones, tennis balls, etc.
Current amp is AricAudio Transcend, Rogue pre,AudioMirror dac,Cambridge transport, ZenWave cables. Decware on the way this year