Hi Guys,
I've not confirmed the DSD channel swap - but the root of the problem is with Pro-Jects tradition of swapping the orientation if the Left / Right RCA output connectors.
When we designed the S2 DAC series we designed the Audio outputs as you would expect - Left Channel on the Left and Right Channel on the Right - but unknown to us, this was modified by a third party.
To avoid having to redesign the PCB, we swapped the L/R channels in the ESS configuration registers - but its quite possible that the ESS has a design bug and only swaps the PCM channel data and not DSD!
There are two reasons we did not notice this bug:-
1. Early engineering units where hand modified by Pro-Ject's manufacture (unknown to us at the time) - if you look closely at some early pictures you can see Wirelink "modifications" to the rear panel RCA - these units where used for Beta testing.
2. We run our own custom software build with the channels "correct" on the rear panel (Left RCA to Left channel, Right hand RCA to Right Channel) so that we dont keep connecting the power amps incorrectly during A/B listening tests.
If its a confirmed bug in the ESS then we will try to swap the channel data in the XMOS (but there might be issue when transitioning to headphones) - and DSD channels will always be swapped via SPDIF inputs (not sure if this is a real issue).
The best thing we can do is to release a custom software that ignores the rear panel labelling and has the correct connector orientation then we dont need to channel swap in the ESS DAC all will be good (in both PCM and DSD mode).