Floorstanders on wood floor, help


Here's the setup:
- suspended wood floor, joists accessible from below
- jute carpet pad, very dense
- carpet, very dense/tight pile
- B&W N803's

We want to eliminate bass bloom while preserving attacks and PRAT. Here's what we've tried so far...

Nothing, flat on the carpet...
soft attacks/PRAT plus lots of bass bloom; worst of both worlds

Speakers on sorbothane footers on wood boards...
eliminated bass bloom but killed attacks/PRAT; deadly dullness

Spikes long enough to pierce carpet/pad and reach the floor...
great attacks/PRAT but enormous bass bloom; coupling to a 13 x 17 x 8 bass drum is not the right idea!

Spikes just shorter than the carpet/pad thickness, so not quite touching the wood floor...
great attacks/PRAT but still annoying bass bloom on some recordings; best we've tried so far, but could be better

Any ideas to preserve attacks and PRAT while controlling bass bloom? TIA.
dougdeacon
Aurios under the speakers! I like to use a set of 4, not 3, under each for stability with speakers. You will need some type of boards (mdf), concrete, marble, or tile under the aurios, between them and the carpet, to maintain a hard and level surfaces. The aurios will tighten the bass bloom (or "boominess", as I prefer to call it) and will also improve staging, imaging, and PRAT!
Thanks, Fp.

I've always had trouble getting my head around bearing devices beneath speakers. I understand how they could isolate the cabinet from the floor and reduce boominess. Shouldn't they also free the cabinet to move backward whenever the cones want to move forward, thus rounding off transients? Whatever happened to Newton's 3rd Law of Motion?

Please understand, I'm not doubting what you've heard. I'm just trying to understand it.

Perhaps the answer lies in Newton's 2nd Law of Motion: the forward-moving mass (a few ounces of cones + air) is so much less than the backward-moving mass (65 pounds of speaker) that the backward acceleration is negligible. If you fire a bullet through a sheet of paper the bullet is no doubt decelerated, but you'd have a tough time measuring it. Have I answered my own question?

If Aurios are good, would Stillpoints be better? Not only do they add isolation in the vertical plane, they're half the price! Anybody?
My final solution was to place a 24"x24"x1" granite slab on the carpet and Aurios MIB between the granite and speakers. Works for me. Also got decent results with Nordost Pulsar points and GS DH cones, which are considerably cheaper.
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