Have you engaged your dealer yet? If not, I'm going to bet if Grant does reply he'll probably send you that way as there are no detailed and absolute answers to many of your questions as yet. The variance between chassis and signal ground measurements can also vary a bit. The guidelines in the document seem clear to me, however. Given that your REL sub has an IEC ground, I would expect that in checking its RCA or other input connection for suitability with Altaira is all that's required. I cannot speak to how you're using the Bryston amp as a "ground" for the REL as I'm unfamiliar with it.Well, I did everything as described and would be at the conclusion based on the documents those two components are no candidates for connecting to the Altaira. Having said that, I noticed that Caelin doesnt go Into the Details in his Suncoast Audio interview on how to treat components like Constellation, Soulution, CH Precision. So I was wondering what PumaCats measurements are with his Constellation amp. I was also wondering about the 1 ohm threshold, because eg the chassis in both my components have hugh/„infinite“ resistance values (= no Connection) whereas the supposed signal grounds only 25/100 ohms. For example I ground my REL sub via the RCA input of my Bryston amp, so does this mean thats still a feasible ground Connection.