[zhgutov]

Thanks for sharing @zhgutov. Am not so technically inclined. Is the RS05/V800 combo more superior in dynamic range and noise level ? I currently have the RS05 / V850 (resampling off) combo feeding into the V280. Thanks.

This pairing is not better in terms of SNR or DR (and this doesn't matter much), but it has slightly less distortion.
I don't like how RS05 pairs with RS06, but V850 my be different, since it is more similar to the V800 by design.
RS05 with V800 produce the best sound and measurements when RS05 is set to 88.2 kHz.
This may be different for V850. So, try it with your ears

 

[AudioPowerHead]

This pairing is not better in terms of SNR or DR (and this doesn't matter much), but it has slightly less distortion.
I don't like how RS05 pairs with RS06, but V850 my be different, since it is more similar to the V800 by design.
RS05 with V800 produce the best sound and measurements when RS05 is set to 88.2 kHz.
This may be different for V850. So, try it with your ears

I’ve tried V850/V280 with and without RS05 and I prefer the former. It simply provides a blacker background and more spartial dimensionality. For upsampling, I am using Audirvana’s SOX upsampling to 176.4 kHz and then max it to 192 kHz on the RS05. This seems to be the current sweet spot for me; before feeding it through to V850/V280.

 

[zhgutov]

This is something I cannot find anywhere, so here it is:

UPD. Frequency response vs level:

Test signal itself is multitone where each frequency is somewhere at -30 ... -50 dBFS.
Noise starts to dominate when it is attenuated by 100 dB.