Turntable isolation...

It's ok I've just read the pdf.

I use extremely low spring rate steel springs for isolating very light things like portable CD players. I use 4 cryo’d high carbon steel springs with medium spring rate for isolating most moderate to lightweight things up to about 40 lb. For heavier things up to say 80 lb I just add another spring for every 10 lb. For really heavy things like big amps and big VPI and Verdier turntables I use Super Stiff Springs, 4 of these babies will isolate things in the range of say 75 lb and 150 lb. For even heavier things add another Super Stiff Spring for every 50 lb. Super Stiff Springs will come cryo’d in the near future. And since these springs are low profile they have excellent lateral support/stability. The reason you have to load the Vibraplane in some cases and the Minus K is because there is a design load based on the spring rate of the device, so to get the lowest possible resonant frequency of the iso device you obviously want to use design load, which is most likely near max load for the design. Air springs have rated max pressure for example.

Arcicci suspension rack.  The top has a 70lb steel platform resting on 3 air bladders, probably overkill for my basis 2200 which is suspended but I love the floating shelves underneath for my components.

"Arcicci suspension rack. The top has a 70lb steel platform resting on 3 air bladders, probably overkill for my basis 2200 which is suspended but I love the floating shelves underneath for my components."

Imagine a car, let's say a Rolls Royce, barreling down the road with two shock absorbers attacked in series to each wheel instead of one shock absorber per wheel.  It would be a VERY bumpy ride, chaos, since the two shock absorbers would interfere with each other.  Same goes for isolating suspended turntables.  

I use a Herzan active vibration isolation table for my SOTA Cosmos.  It made a surprisingly big difference, I thought, when I installed it ater 3 years of using the Cosmos on a heavy walnut shelf/rack.  The unit has lights that show you when each of the different axes of active isolation are actually in use, and they really only go on when I am playing at loud levels with a lot of bass energy.  The main table seems to be a heavy aluminum plate on tuned springs, and by itself it makes a clear difference.  It just upped the level of transparency in the musical presentation, removing some consistent colorations/resonances that were overlaying the playback.  And I could also clearly hear deeper into the music.

I stumbled upon two of these tables on Ebay 6 years ago, mis-labeled, and I bought them for ~$800 total, otherwise I probably would have a hard time justifying them.  When they arrived at my workplace on a pallet, we hauled them onto some welded steel tables in our Lab, plugged them in and let them warm up.  I then poured 4 cups of water and placed one each on the two Herzan tables, and one each on either side on the Lab tables.  I then "tympani rolled" the table tops with my fists and the water danced out of the cups sitting on the Lab tables, but you saw no ripples on the ones on the Herzan tables.  I howled with delight!  They sure seem effective.