@david_ten I was thinking taller feet as well as I had similiar results with some large Jamo Cornet 100's back in the 90s. There were no feet, so used brackets and JB weld with threaded rod and caps, a college upgrade. Bass tightened up nicely.
Your comment on doubling up the isolation with shelves and additional gliders had me recall the Townshend isolation speaker platforms. The price has me looking for other tweeks. Is your isolation shelf basic mdf or something fancy?
Your comment on doubling up the isolation with shelves and additional gliders had me recall the Townshend isolation speaker platforms. The price has me looking for other tweeks. Is your isolation shelf basic mdf or something fancy?