I heard these devices at Axpona last year. CAD had a complete system with at least three ground controls, their streamer and their DAC. The system sounded amazing to me - digital but not digital. It was hard to say what was making the magic but I purchased a CAD GC1 in hopes of capturing some of it.
In my system it did several things
> much more tone color - sounded gray when I removed it
> much better low bass (I have Vandersteeen 5A carbons so when you change the bass it is very audible)
> smoother and quieter without loss of detail, especially with crescendos
Indispensable devices IMO. I am going to get another one.
It has improved every system I have been allowed to try it with.
In my system it did several things
> much more tone color - sounded gray when I removed it
> much better low bass (I have Vandersteeen 5A carbons so when you change the bass it is very audible)
> smoother and quieter without loss of detail, especially with crescendos
Indispensable devices IMO. I am going to get another one.
It has improved every system I have been allowed to try it with.