One thing that hasn't yet been mentioned is that if your connection between the Blu-Ray player and the RDAC is via digital coax, the LENGTH of the cable can be a significant factor. It should either be very short, less than say 12 inches, or it should be 1.5 meters or a little longer. See this paper.
Use of intermediate cable lengths, such as 1 meter or 3 feet, can worsen jitter by causing waveform reflections resulting from impedance mismatches to arrive at the DAC input at critical points on the signal (i.e., near the mid-point of its 0 to 1 or 1 to 0 transitions).
Use of non-optimal cable lengths is most likely ONE reason for reports of sonic differences between transports. Different transports will have different degrees of impedance mismatch to the cable and connectors, and perhaps more significantly will have different transition times (risetimes and falltimes). If a non-optimal (intermediate) length is used, the effects of impedance inaccuracies will vary unpredictably depending on the relation between cable length and signal rise and fall times, and also on the jitter rejection capability of the particular DAC.
Regards,
-- Al
Use of intermediate cable lengths, such as 1 meter or 3 feet, can worsen jitter by causing waveform reflections resulting from impedance mismatches to arrive at the DAC input at critical points on the signal (i.e., near the mid-point of its 0 to 1 or 1 to 0 transitions).
Use of non-optimal cable lengths is most likely ONE reason for reports of sonic differences between transports. Different transports will have different degrees of impedance mismatch to the cable and connectors, and perhaps more significantly will have different transition times (risetimes and falltimes). If a non-optimal (intermediate) length is used, the effects of impedance inaccuracies will vary unpredictably depending on the relation between cable length and signal rise and fall times, and also on the jitter rejection capability of the particular DAC.
Regards,
-- Al