They look incredible.. Those giant tubes must be awesome at night. My amps are 1,100 watts, but I think the first 20-50 watts are always the most important, especially in AB amps like mine. I am glad to hear you are getting such grip with those amps. I think the orchestra’s are a bit more sensitive than the quartets I have. Mine are mk1’s, and may be as low as 83. The website says 89 for yours. Not sure how much that makes a difference. Anyway, based on the videos you posted, they sound great. As for isolation, here in Taiwan a lot of audiophiles put these marble tiles underneath speakers (depending on floor/room). They are a local hard black marble and come in 2 or 3 cm versions. The isoacoustics made a HUGE difference on my speakers, then the marble added some as well. I would say 85% isoacoustics and 15% marble (to use a silly arbitrary number)…