adamdea;582298 Wrote: > Dear John > It is a great privilege to have you post a reply on this thread (even > if not to me!). I wondered if i could try you patience by asking a > couple of questions > > I. I wonder if you could express a view as to what the cut off > threshold for resolution (as you measure it) where a higher level would > probably make no discernible difference when playing 24 bit audio > files. > I note that the AYRE DAC which is regarded by Stereophile as a state of > the art DAC was measured by you as having 18 bit resolution. I have > noticed that some other devices have measured higher (including the > transporter but also as I recall the MF X DAC v3. However i appreciate > that you have changed measuring equipment so some comparisons may be > invalid )Clearly this is not the only determining factor of sound > quality, but do you think it would make any perceivable difference > ceteris paribus if the resolution of the Ayre DAC were higher. > II. Do you ever measure the outputs of digital transports? (I can't > remember seeing such a measurement). If so what do you (or would you) > measure. What sort of factors affect the sound quality of a transport > outputting to a decently designed modern DAc via SpDIF. > > III. Many contributors to this forum have expressed surprise at the Log > Touch'es class D stereophile rating- this is presumably based on the > analogue outs(?) Could you venture an opinion as to how it would > compare with a conventional CD player outputting to a decent DAC. > Obviously the quality would depend with the DAc, but given the DAC.... > > > Also can you recommend a good book an the basic principles of digital > audio.
I'm sure John will be along soon, but in the meantime, there is only 1 thing to measure in a s/pdif signal: Does it have nice, clean-edged waveforms, as square(ish) as possible with an accurate clock within it? (OK I suppose that is 2 things...) Any noise/rfi/cable or termination reflection would make the waveform less perfectly square... Any imperfections in the waveform at the DAC end make it harder for the DAC to recover the clock accurately due to increased uncertainty regarding the transition points... JITTER! -- 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=82050 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
