seanadams;573355 Wrote: > At least two different power supplies shipped with SB3 over the years. > The newer ones are way better. To which are you referring? The Unifive > ones were just barely FCC compliant, but the Logitech branded ones were > vastly quieter. > > Edit: I still maintain my original position as to how little noise > actually makes it to the outputs in either case, after the two stages > of internal regulation.
Hi Sean, All three of my SB3s have the same PS, they don't say Logitech on them so they must be the Unifives. I was not aware there was a better one shipping with some SB3s. The one with the Touch is WAY better. Yes I agree, on the SB3 I do measure a tiny amount of noise from the supply inside the box, but thats probably because there is so much coming from the supply in the first place. On the Touch Even that is not there. The Touch has extremely quiet supply rails, especially for a device with a builtin computer. The only issue I've seen is that when supplying current to an external device there is a little bit of 120Hz noise on the supply rails. I'm not sure how this is getting through. The only place it can come from is the supply, but I would expect the regulators to do an excellent job of getting rid of any 120Hz. I have tried very carefully to state that advantages of going with a linear supply are related to less noise getting into other parts of the system. John S. -- JohnSwenson ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=81454 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
