Am I tripping? Is PCM768 physically possible?
Tripping? It depends on what drugs you took. 
No, you’re not.
Yes it can up sample to that rate. However the original recording isn’t going to be at that rate.
Per Google:
The AK4191 is a premium stereo digital delta-sigma modulator designed by AKM (Asahi Kasei Microdevices) to pair with their flagship AK4499EX DAC chip. It handles intense oversampling and digital noise filtering, supporting a maximum PCM sampling rate of up to 1536 kHz at 64-bit depth
HTH
This is what I meant. AES is not supposed to be able to take native PCM768 signals. But obviously the RD160 IS taking PCM768 thru AES…
Is it upsampling automatically?
I know that I can up sample from my mac to 768kHz on my RS520.
(The mac’s MIDI app recognizes the ability of the RS520 thru the USB port. )
I realize this doesn’t help w the AES, but that it may be similar.
It’s not about upsampling or not. You can see that the RD160 is showing “From PCM768”, which means it’s able to detect and playback PCM768 signals from the AES input port, which generally should be considered physically impossible.
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Are you talking about I2S when you say input port?
I agree this doesn’t make a lot of sense since as you point out native AES/EBU is 192kHz
But I suspect there’s something else here.
No bro, just look at the pic in the first place. My RD160 is using AES input, and it senses PCM768 and is playing music. I am outputting PCM768 on my source too, out of curiosity as a test.
That’s why I said am I tripping…
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Ok, this is weird.
I don’t know that it is physically impossible.
A single wire is supposed to be 192kHz and then 2 wire is 384kHz.
But… here’s the interesting thing… to get a PCM of 768 x 32bits, the clock signal would have to be around 49kHz (49.216kHz to be exact) at least according to Google.
So if you are sending 768PCM to the Rose… if the clocks can sync… why would that be impossible?
Would love to know what Rose says about this.