PasTim;642612 Wrote: > Tinkering some more with the various Windows vs Creative vs ADM sound > recording settings I finally found a combination that worked (except > when Sample Rate Compensation was used which always caused ADM to > crash). > > Having run a few tests I think ADM is so sensitive that it can only be > used to make fine changes to essentially the same system. This means > it's great for comparing the Touch with itself plus or minus a tweak or > two. > > However, all attempts thus far to compare any two different analogue > sources (eg 2 CD players), or an analogue recording with an original > rip, have met with results that imply the recordings are almost > completely different (correlations running between 13 and 15). I have > tried using the Equalisation facility (without Sample Rate > Compensation) but that didn't help. > > How much this is due to limitations of my soundcard's ADC I don't know, > but I'm not going to pursue this line of comparison unless anyone has > any ideas of ways to get more meaningful results. Suffice to say that > at this level of correlation the difference tracks contain perfectly > recognisable music. > > I may have a go comparing digital outputs from the Touch and CD players > at some point.
I'm afraid the creative card isn't up to the job. At a minimum you need to use a card that doesn't internally resample. Also, sample rate correction is essential. Without that, your results look about right to me. When comparing different CD players, their respective clocks will be drifting all over the place (relative to each other) and without sample rate correction you just won't get meaningful results. If you playback the resultant difference file and hear it fading in and out in level over time, with a "phasing effect", that basically means that the sample rates are moving relatively. SRC will get rid of all of that. I've been able to get comparisons of cd (rip) playback against the original CD PCM file in the 30-40 range which is not too bad. At the end of the day the absolute values aren't critical; If you get one comparison at 30 and another at 40, the 40 one IS closer to the original sound... -- 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) - Audiolense 3.3/2.0+INGUZ DRC - MF M1 DAC - Linn 5103 - full Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Pekin Tuner, Townsend Supertweeters, Blue Jeans Belden Digital,Kimber 8TC Speaker & Chord Signature Plus Interconnect cables Stax4070+SRM7/II phones 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=84742 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
