You may wish to contact AudiogoN member Islandear (Blaine). I know he has used the Symposium base for many years. I have used the Symposium Svelte shelves between my Encore's bass and mid/treble cabinets for a few years, and I am very happy with the results. I do notice a slight bit more articulation using the Symposium shelves. I haven't tried the bases, but I did switch to Audio Points 1.5 AP-A feet instead of the stock Verity spikes, again with some improvement in clarity.
Cheers,
John
Cheers,
John