DaveWr;397917 Wrote: > at the risk of being flamed ;-) > > I fail to see the validity of this testing in a true hifi context. > > The device you are testing is re-digitised with an ADC. then you > compare the output digital data using the application. Well the ADC > has its own transfer function. It's probably a DAC and comparator ADC > internally. This means it has to have its own filters for > anti-aliasing etc. If the transfer function of the ADC is not highly > transparent related to the signals you are comparing, it itself will > filter and mask variations, I expect particularly in the high frequency > domain phase and transient performance. > > Basically you can't see differences that the ADC can't code, due to > noise floor, aliasing filters and actual bit resolution. It's like > using a 1MHz scope to look at 100kHz square wave edges (albeit an > extreme case). > > So don't throw your special bits out yet, they may make the difference > in parts you can't measure with the system, but can perceive. > > Dave
Dave - the reason why this logic doesn't apply is detailed in the help file of the application. The transfer function does NOT have to be highly transparent - it just has to be consistent - which it is. If you think an ADC can't capture the nuances, you have to ask yourself "how on earth did those nuances get onto the CD in the first place?" If it's on the CD you can record it on an ADC. Period. -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... SB3 (wired) - 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), Townsend Supertweeters, Blue Jeans Digital,Kimber Speaker & Chord Interconnect cables Outdoors: Boom ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=56591 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
