I have evolved to this arrangement with my Tannoy DMT-15’s that began with the loudspeakers directly on the cork flooring.
1. Custom made MDF stands filled halfway with sand placed on the cork floor with no bottom spikes.
2. Three Symposium Roller Block Jr’s, the bottom cup has a threaded insert so is bolted to the top of the MDF stand.
3. I later had a Symposium Svelte Plus custom made to fit inside the flat base of the loudspeaker to give maximum contact area to the bottom of the cabinet.
I cut some initial comments and impressions from the original set of posts.
I ordered a pair of Symposium Svelte Plus platforms to place directly under my DMT15's. They use constrained layer damping that is suppose to sink vibrations from the speaker cabinet and stand. The platforms are intended to sit on top of their Rollerblock Jr's which provide isolation, they have a resonance frequency of around 2 Hz. I have been planning on doing this move for sometime and yesterday finally took the plunge after a long conversation with Peter at Symposium. I should get the platforms in a couple weeks as they have to be customized to fit the bottom of my speaker, their stock size was a half inch too wide. Hopefully they provide the performance you obtained. Stay tuned!
I had a long conversation with Peter from Symposium. Basically what I got out of it was that the Rollerblocks isolate and mostly help with the bass. The svelte shelfs directly under the speaker allows somewhere for the speaker cabinet and stand to dump vibrations and turn it into heat via constraint layer damping. The svelte shelf benefits mid bass and up. The goal of the design was not to impart any coloration to the speaker. Looking forward to getting them in place!
Got the Symposium Svelte Plus platforms yesterday. They arrived very professionally packaged and the build quality is superb. I was anxious to get them in place and get down to listening. I had them made to fit flush with the 18.5 X 14.5 recessed bottom of the speaker so had them made 18 X 14. This left a quarter inch gap clearance to place the 100 lb. speaker into. This was something I was a bit concerned about doing myself as no one was around to help till later and I wanted to get them in ASAP. I managed to get them in place without breaking anything or hurting myself in the process.
Here's a couple pictures I snapped this morning which shows how they look in place. I think they really look smart with the style of the speakers and stand.
I'm blown away with what the platforms are doing. Any positive music or hi-fi adjective you want to use to describe the sound or performance could be used here. I'm clearly hearing the largest boost in performance ever from this room in the 23 years in this home. The platform and roller bearings are being used just as the designer intended and the interface with the platform is allowing a maximum amount of vibrations to be dumped.
I was expecting an improvement but what I'm getting far exceeds that. Glad I took the plunge. Addressing the LP12 with a bit of Symposium product is next, but not for awhile. I need to get my head around and enjoy this for awhile.