My Quadrature Z monoblocks have a base that Steve designed. It’s made of copper and provides a multi-layer damping and ground system. This feature is available through Rick Brown at Hi-Fi One who represents the Berning product line.
Steve is one of the nicest guys in the business. I had the pleasure of meeting him at some of the SoCal audio society events when I lived in the area. In my opinion he is another one of the top audio engineers out there, but he tends to keep a low profile.