Isolation for speakers on spikes

I'm with Warren. Dampening the resonances in speakers and transferring that energy to the floor (mine is concrete) has worked perfectly for my Dynaudios. When I have placed them up on stands (MDF) or removed the spikes, I lose definition and precision. If I ever use stands for my floorstanders I will use solid heavy coupling devices and weight the speaker to make sure it couples to the floor. My speakers don't need isolation, they need coupling to the solid floor to bring out their best. Experimentation is everything. I know of no way to give them isolation and coupling. But, as always, best of luck with your experimentation. And, more importantly, have fun! It's only about the music!

Actually if you call the boys at Zu they will downplay the importance of their spikes or aftermarket brands. Not needed at all. Check with Sean or Adam to verify this.

If your problem is that the speaker enclosures are resonating in a bad way and affecting the sound: you might look at heavier, stronger and better braced speaker designs rather than trying to compensate for these vibrations by making coupling resonances with the floor or stands. Fixing the root cause of the problem is often better than band aids.

Grant is right on that. Robert over at Starsound will do whatever it takes to get the system that is right for you. You have 30 days to play with it. No good? Back to Starsound. Can't beat that with a stick. Tvad, do you know if Exemplar/Denon has that rattling issue with their 3910?