Granite Slabs

Ah, good to know! Now where to find some local granite shops around Indiana!

Chasing the wrong things it appears.

Draining the vibrations has proven to be the best "sounding" solution.

Stack Audio Auva units are much simpler to deploy and produce tighter bass and more presence into the room from your speakers.

I've tried all ideas above before Gaia's on my Wilsons for years. Gaia's try to isolate. The Auva's drain the vibrations. Day and night improvement. So glad Stack Audio came along.

Just ordered Auva SW's for my REL subs and anticipate improvement there as well.

Messing with granite and spikes and all of the ideas here w/o the math is expensive and not rewarding from my experiments. Check out the Stack Audio products. They really work.

Happy listening!!

I have a set set of Linkwitz Orion loudspeakers. When I approached the problem of isolating them I tried spikes without a good result. Then I found out that Siegfried Linkwitz himself recommended a slab of 1 in thick felt. FELT said I !!  But being very reasonably priced I bought the material and placed it under the speakers. Who would believe it !  It worked extremely well and is still there!

Not sure that would work with 215lb speakers and carpet?

I would find a stone masonry company that does work for high quality residential builders.

I am guessing they occasionally have offcuts or the cutouts from dual bathroom sinks for example. These would only require cutting to size and edge polishing.

You could also have them drill corner holes to accept threaded lead anchors. Just size them to accept IsoAcoustics Gaia's or whatever you prefer..