David Berning Co Quadrature Z –– First Pair!

Here's an opportunity to own a one-of-a-kind prototype made by David Berning. I purchased these from the original owner, an authorized dealer, in June 2022. Here's some information about these unique amplifiers: "In 2007, I approached David Berning asking him to design an uber-high amperage Outp...

Here's an opportunity to own a one-of-a-kind prototype made by David Berning....