Yeah, the RS05 offers a lot of new possibilites.
If I had the RS05 I'd test
PC -> AES -> RS05 -> AES -> RS06
PC -> AES -> RS05 -> Coax -> Gungnir Multibit
PC -> AES -> impedance converter AES/Coax -> RS06
PC -> AES -> impedance converter AES/Coax-> Gungnir Multibit
RS05 always as an external wordclock to the AES card. Then compare both RS05 femtoclocked chains vs. direct connections.
and at the last just for the sake of it: USB Out of the RS05 (when not in wordclock mode) to Gungnir Multiibits USB in vs. PC to Gungnir Multbit
just to see how effective the RS05 can be.
That all is something for the cold days though.
I tested RS05 connected to V800 with AES, coax and TOSLINK.
The best thing is AES according to my measurements.
There is additional noise floor in the case of coax or TOSLINK on high frequencies.
But I am not sure this can be heared (because this is probably random/gaussian jitter).
And probably, it is caused by the receiver of V800 (RS06 and V850 may be better here).
I don't have the spectrums right now, but the difference between internal clock of V800 and external clock of RS05 connected to V800 may be seen here.
V800 internal (IMD+N swept):
RS05 => V800 (AES):
This is not the distortion! The graph represents the IMD+Noise, and you see more gaussian noise on high frequencies here.
In the case of coax or TOSLINK this noise is higher.
But the most important thing here is the clock accuracy, phase jitter. It is better in RS05, I suppose.
I cannot measure it directly, but it is easy to hear the difference.