I know NOS dacs need careful system matchingJust curious, why is this?
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The most important thing with a NOS DAC is to feed it a really low jitter digital signal. Most Transports will not do.
Also, if the output is direct from a stack of 1543's through a signal coupling capacitor or the like, then driving a high-capacitance cable is potentially problematic. If you want the best performance from it, use low-cap cable and drive high-impedance (50K ohms+) input.