Here are sample rate supported by soundcard:44.1 khz, 48 khz, 96 khz, 192 khzSo which sample rate would you use , and why ?
- I can hear differences, but if you ask me to verify such claim, I don't know how it could be ABX ed.
- the measurements at tech report website, indicate that the xonar stx perform better at 96 khz , than 44.1 khz.
I found the results of rmaa a bit (un?)reliable, and although I tried to not touch the volume knob, I saw variations in the reported volume. Sometime I got too wrong result (maybe because I surfed a bit ?) so I've redone test.
while windows allows to set also another sampling rate in the mixer, playback section
I'm not sure the "Stereo Mix" feature makes the audio go through the DAC and the ADC? I.e. did RMAA actually measure the sound card?
I notice that you're recording the "stereo mix", so another other sounds (eg synth or un-muted mic or line-in) would cause a problems. The one-off 78dB measurement certainly looks like an anomaly.
Here's how I 've done connection: between headphone output and "line in". The xonar stx use the same connector for line in & mic.Also regarding the cable I used for loopback, I'm not sure if it is good. In both end of cable I've added a jack adaptor.
I noticed before other anomalies, and I've redone few tests.
You should be getting better 16-bit results still when setting the headphone out to "600 ohm", though this may be pushing the abilities of the input stage.
I saw variations in the reported volume.
I've been told that changing the headphone impedance setting in the panel of xonar stx , does nothing special : it just define a new volume limit.