nicketynick;203733 Wrote: > A new thing for me to learn today! > I'm sure there's a good reason why the grounds aren't common, but can't > figure out for the life of why???? The problem isn't that the grounds aren't common - they are, but that in this installation, none of the grounds are actually connected to the mains ground. In other words, the whole setup has a floating ground.
Why is this a problem? Well, the signal that is reproduced (and amplified) in the system is the difference between the ground and the actual signal. The ground should nominally be at 0V. But if it's floating, and if there's any 50/60Hz ripple on the 0V side of the power supply, then that ripple will be treated as signal by the amp. Therefore it needs to be shunted to a real ground (eg. via the mains ground) to eliminate the ripple. My experience with the stock Squeezebox power supply is that it does seem to have a fairly high degree of mains ripple. Traditionally, it's the amp that tends to be grounded, and other components are grounded via the amp. It would seem that Naim amps are peculiar in this respect, expecting the source component(s) to be grounded. -- cliveb Transporter -> ATC SCM100A ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=33414 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
