I was told that Steve Mantz of ZED did the design of these guys. Is this true? Asking as I have an issue with collecting ZED done amplifiers and I have not been able to get a hold of Steve in a little while to confirm. I had not seen too much on here yet about them. If I were to buy a new PG (yes we at SSA do make our own amps, but not a 6 channel yet and we cannot afford Mantz) I would probably lean SX over anything else because of who is behind them.
Not to say he's doing it for multiple companies at the same time, but he has been hired by AD to design all of their amplifiers. He's been working for them for a few years now.
"ZPA's will have the same sound essentially as you get from the MS, they just feature a bigger shinier set of balls."