Turnandcough;682907 Wrote: > I know we're straying off topic but one last thing. > > Does coax cable length really matter? Some people say you need a > minimum of 1.5m to avoid reflections. > > If so - why do so many so called "high end" cable manufacturers sell 1m > cables? You'd think they would want to advise their customers against > this. > > And what about internal circuits in DACs, CD players, etc? Surely they > don't have 1.5m of cable snaking around inside the case.
The logic behind cable length rule is a balance between two adverse effects: A- the cable acts like a filter on the signal resulting in altering frequency response with more or less impact on the sound depending of cable characteristics (LRC, dielectric,...) -> the shorter the cable, the better B- poor adaptation of the impedance at both ends of the cable is inducing signal reflection and stationary waves that interfere with the original signal -> the longer the cable, the higher the attenuation of the reflected signal, the better The longer than two meter rule comes from the assumption that reflection noise is of another order of magnitude than the alteration of the sound caused by a decent quality cable, especially for the Touch where S/PDIF impedance is poorly matched. -- evdplancke ------------------------------------------------------------------------ evdplancke's Profile: http://forums.slimdevices.com/member.php?userid=43147 View this thread: http://forums.slimdevices.com/showthread.php?t=91322 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
