mswlogo;544954 Wrote: > I did the test the way phil suggested. And resukts were worse. So bad > that the -24dB analyze could not find sync pulse. > > I understand why you want to do it this way but I think It's not > right. > > You are stressing the ADC on sound card but not stressing the sound > card peeamp gain. > > The way I did it I'm feeding similar levels to ADC but I'm stressing > the input gain preamp on sound card. I believe the analog circiuts are > more stable > > What I'm looking for is regardless of how good your analog side is or > gain what does the DAC lose by shifting it's bits lower. Note that > folks that use it as volume have Full gain on analog side. > > I figured out good test really see effects of digital attenuation that > removes effect of preamp input gain on sound card but still give same > levels to adc on sound card. > > Test the test signal and attenuate it by say 12dB digitally. Record it > at full scale as best you possibly can. Fine tuning everything. > > Now switch how you attenuated. Put digital back up to 0dB and attenuate > in analog by 12dB. > > Preamp gain stays the same (may need a tiny tweak). Levels that reach > adc will also be the same. > > The only difference is how we attenuated. This exactly what we want to > compare. > > I ran the test but have not had a chance to post it yet.
The -24dB test won't work because the sync signal is too quiet after that much attenuation... Anyway, I feel the end of the road has been reached now. We are probably going to have to agree to disagree on this topic. I'm happy with the numbers from the tests. I'm happy that using 12dB of digital attenuation (the max I am using with Replaygain) is still giving me 90dB of dynamic range/SNR - which is more than enough for me and my musical tastes. I've tried listening carefully to very quiet tracks and very dynamic tracks (like your Offenbach example) and can't hear any degradation at -12dB. In reality such tracks require replagain boost rather than cut. Things like DRC make a much greater impact on my personal listening pleasure than the theoretical loss of 6dB of SNR which I can't hear anyway. YMMV. Have a good evening. -- 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), Townsend Supertweeters, Blue Jeans Digital,Kimber Speaker & Chord Interconnect cables Kitchen Boom, Outdoors: SB Radio ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=78477 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
