I have no opinion on the audibility of the EtherREGEN since I haven’t heard one. I’m just pointing out that phase noise does matter and it’s worth trying to minimize it. John’s a good egg and I’m sure he’s doing something worth doing. I don’t know how much difference it makes in any given system. I have heard the USB REGEN. It’s design makes sense and it made a noticeable difference to my ears, but once again I don’t know different it might sound in any given system, nor the value for any given person.
I should also add that I take a lot of pains in the DS to filter jitter and phase noise. I don’t know if the EtherREGEN has a lower control loop bandwidth than the DS.