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. -- mswlogo XP > Cat5 > Transporter/DuetController > SPDIF > Meridian G68 > DSP6000, DSP5500HC, DSP5000 XP > Cat5 > SB3 > SPDIF > Meridian DSP5000 XP > Cat5 > DuetReceiver > SPDIF > Meridian G91 > DSP5000 'My Transporter Setup' (http://forums.slimdevices.com/showpost.php?p=350741&postcount=45) 'Hitch Hikers Guide to Meridian' (http://www.meridianunplugged.com) ------------------------------------------------------------------------ mswlogo's Profile: http://forums.slimdevices.com/member.php?userid=9090 View this thread: http://forums.slimdevices.com/showthread.php?t=78477 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
