The reason for the >=1.5m length has to do with controlling signal reflection due to impedance discontinuity on the receiving end. For example, my TacT 2.2xp has poor internal construction in terms of impedance control. A 1.5m cable sounded significantly better than a 1m cable from my Transporter (stronger, deeper bass, better dynamics, etc). It is because the longer cable will cause the reflection to travel a longer distance and it allows the original signal rising edge to complete the signal transition before the reflection arrives, preventing interference to the original signal rising edge. The cable length is a function of output pulse transformer's pulse rising time, cable dielectrics and cable inductance. 1.5m is probably on the best case scenerio. One can also put a 3db or 6db attenuator on the receiving end, to reduce the effect on signal reflection.
If the signal receiving gear has well controlled impedance, then little or no impedance discontinuity occurs. A shorter cable is preferred in this case. It is because longer cable will have a longer signal rising edge. Usually, the addition signal delay is 1.4ns/ft. In general, we want shorter signal rising edge for better performance. -- Kuro ------------------------------------------------------------------------ Kuro's Profile: http://forums.slimdevices.com/member.php?userid=16701 View this thread: http://forums.slimdevices.com/showthread.php?t=84751 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
