I listened to the Differential/DAC preamp for quite a while. Again, this system (and concept) though not new (Frank offers a phase inverter all ready), the preamp/phase inverter/DAC is a new approach. The impact is startling and the distortion is gone. The bass line is as real as I've heard, not just boom, boom, boom like from other audio manufacturers, but actual bass notes distinguishable between each other.
The other system I heard was a prototype. In fact, he's got a bunch of prototypes going. Of course this is nothing new because Frank is always working on new things or at least trying out new things. He is always looking for ways to improve performance.
As far as me commenting on a comparison of components from different family lines, I really can't. First, the price point between the Ultra and Differential and the goal of the 2 very different product lines are not apples and apples. I think the people who would be interested in either product maybe so for so many different reasons. I'll leave that up to Frank to comment on the virtues of each system. I don't even have an Ultra, it's out of my budjet for the time being and I don't need 3 preamps.
I guess the real message is that Frank is burning the mid-night oil and is really getting into some neat stuff. If it all works out in the end, we all benefit by becoming a customer of some very forward thinking audio designs.
Wayner
