My first thought is the Nakamichi pre-amp and amp in question are analog units. I don't think they accept a "coax" digital signal.
Also I don't think feeding them anything but a "Line Source Signal will work. Meaning no amplification of the signal before it enters the Naks.
Hope this helps.
Brad
Also I don't think feeding them anything but a "Line Source Signal will work. Meaning no amplification of the signal before it enters the Naks.
Hope this helps.
Brad