Fiddler, if this is what's happening in your case:
"All coupling does to many suspended floors is excite the floor which creates a delay in the sound traveling in the floor and it muddies the bass badly."
Then it's because the wood floor is flexing (what you call "excite") underneath the speaker allowing the woofer motion to rock the enclosure back and forth. Remember, it only takes 1/16" of deformation (flex) in the floor for a 5 foot tall speaker to rock back and forth as much as 3" at the top! There are three possible solutions:
1.) (the easiest) reposition the speaker so the front and rear spikes/cones/feet are on top of, or very close to, the (two closest) joists themselves (as discussed earlier)
2.) If (1.) isn't possible for some reason, then put blocking (little cross joists) between the two joists right under the speakers and/or put posts (or jacks) from the ground to under the floor where the speakers sit.
3.) If (1) and (2) aren't possible, the best solution (a bit of a hassle to do nicely, but works great!) is to run a brace (aluminum tube or plastic PVC pipe works well) from the top-back of the speaker to either the wall behind, or back down to the floor at least 4 feet behind the speaker, and secure it.
Any of these solutions will keep those woofers from rocking the cabinet instead of your ears. An additional benefit will be better highs and mid-range transients.
Hanging speakers can work also, except the chains or cables need to be splayed enough to insure that the speakers don't sway even a little. That's sort of an ugly tour-de-force don't you think?
"All coupling does to many suspended floors is excite the floor which creates a delay in the sound traveling in the floor and it muddies the bass badly."
Then it's because the wood floor is flexing (what you call "excite") underneath the speaker allowing the woofer motion to rock the enclosure back and forth. Remember, it only takes 1/16" of deformation (flex) in the floor for a 5 foot tall speaker to rock back and forth as much as 3" at the top! There are three possible solutions:
1.) (the easiest) reposition the speaker so the front and rear spikes/cones/feet are on top of, or very close to, the (two closest) joists themselves (as discussed earlier)
2.) If (1.) isn't possible for some reason, then put blocking (little cross joists) between the two joists right under the speakers and/or put posts (or jacks) from the ground to under the floor where the speakers sit.
3.) If (1) and (2) aren't possible, the best solution (a bit of a hassle to do nicely, but works great!) is to run a brace (aluminum tube or plastic PVC pipe works well) from the top-back of the speaker to either the wall behind, or back down to the floor at least 4 feet behind the speaker, and secure it.
Any of these solutions will keep those woofers from rocking the cabinet instead of your ears. An additional benefit will be better highs and mid-range transients.
Hanging speakers can work also, except the chains or cables need to be splayed enough to insure that the speakers don't sway even a little. That's sort of an ugly tour-de-force don't you think?