JohnSwenson;579482 Wrote: > I have done tests on an SB3 (not a Duet) and a Touch. I don't have the > super expensive jitter testers these tests really should use (I can't > afford them!). What I DO have has a threshold, the jitter has to be > above that threshold to register at all. Once the jitter is above that > threshold its quite sensitive to jitter changes. It does very well at > measuring clock jitter but very poorly at measuring S/PDIF jitter, so I > have used it to measure the clock jitter in the box. I need a different > tool to measure the S/PDIF jitter (which I don't have) > > With the SB3 I have tried three different PS, the one that came with > it, which was a very poor PS, the Touch PS and my homebuilt linear > supply. In all three cases the jitter is significantly above the > threshold of my test equipment. > > The jitter with the SB3 switcher is significantly worse than the Touch > or linear supply . I could detect no difference between the Touch or > linear supply. > > On the Touch I did not try the SB3 supply, just the Touch and linear > supply. The Touch clock jitter is just below the threshold of my > equipment with both supplies. > > I have done lots of other measurements on the supplies besides jitter > measurements. I have found that the original SB3 supply injected a > large amount of noise back into the AC main. The Touch supply is WAY > better, but not perfect, it still injects a little noise back in the > mains. The linear supply injects almost no noise at all into the mains. > (which is NOT true of all linear supplies, but thats a whole different > thread) > > I CAN hear a difference on the analog outs on both the Touch and SB3 > when switching between the Touch and linear supply, but I'm not sure > exactly what is the cause. I'm more inclined to think it has to do with > the rest of the system responding to the small differences in noise > injected into The mains than it is to changes in jitter. > > I have not done exhaustive testing on the digital out into a DAC as far > as PS differences are concerned. Even if I had, the sensitivity to > jitter of different DACs varies greatly, so any generalizations would > be very hard to come by. > > John S.
Hmmm... that would agree with my results. No change in the output of the Touch itself but MAYBE a change in the overall system sound (pre/power amps picking up something?) This is HIGHLY system dependent. Can't hear any difference in my system. -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... Touch(wired/XP) - TACT 2.2X (Linear PSU) + Good Vibrations S/W - MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Pekin Tuner, Townsend Supertweeters, Blue Jeans Digital,Kimber Speaker & Chord Interconnect cables Kitchen Boom, Outdoors: SB Radio, Harmony One remote for everything. ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=82128 _______________________________________________ Touch mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/touch
