Pat, I’ve seen the airlink site, but what I myself have is the Equi=tech product (www.equitech.com - there is lots of interesting reading on the site; and an old Stereophile review at https://www.stereophile.com/content/monster-power-avs-2000-automatic-voltage-stabilizer-equitech-2q-q650-balanced-power-systems-0). Not all transformers are equal, it seems. The Equi=Tech 2 kVA one that I have weighs about 75 lbs, in a case that isn’t heavy itself and is no more robust than it needs to be. (That is, made for pro audio rather than to impress audiophiles.) The current cost in the US is about $6k, I think. There don’t seem to be any cheap routes to audio nirvana, alas.