OPA1612 in the input buffers the same as the reference (or evaluation) design?
Also, damn if you couldn't have released the stereo Purifi amp a couple of weeks ago so I could have considered it before dropping the funds on a couple of similar French Audiophonics Purifi amps. Which are a little less expensive and made with cheaper cabinets which doesn't bother me because I appreciate the value. I am however going to replace the generic binding posts for some copper posts that your amps already use. Which removes some of the initial value. It's never made sense to me for power amplifiers to use brass binding posts that are much worse conductors than copper.
Electrical Conductivity difference between alloyed brass and plated copper terminals is not particularly significant for audio gear. Gushing marketing blurbs indicate that pure copper terminals are the latest audio fad.
https://www.copper.org/applications/industrial/DesignGuide/selection/conductbrass02.html
The compatibility of materials in contact at connections is a more important consideration.
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