I2S 2:1 switching module

Joined 2009
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Look, its very particular RF. You need a fast enough scope to see what's going on. You need 4-layer boards with ground planes, and proper impedance interconnections between boards. You need good clocks. You need clean power. If the implementation is crap, then the sound may be crap too.

IOW its not just 'long.' Long can be fine if its done properly.
Yes I know the importance of characteristic impedance to meet the signal integrity and avoid reflections & loses.
Joined 2009
Paid Member
Andrea offered me his solution:

- DRIXO oscillators at 22.5792 and 24.576 MHz I guess two units because it's only one output per board + two crystals.....$$$$$$
- TWSDAC-DSD discrete DSD DAC (not yet published)

But this is a lot of money and I'm not sure to invest without guarantee of the best SQ for noDac + Simple DSD Modulator
I once paid $2,200 for a Benchmark DAC 2. Topping D90 sounded better. My AK4499 dac sounded better than D90 here on this system. Andrea's DSD dac sounds better than my AK4499 dac did. Now, I don't know how Andrea's dac compares to Chord, Holo, Mola, DCS, etc. IMHO though, I'm keeping it as my main dac. It can be amazing how much information encoded in a recording can go missing, and yet no obvious audible clue anything at all is wrong. It sounds like that's all there is supposed to be. It can measure very well, too. The illusion that you are hearing everything encoded in the recording persists until you hear the recording on a better system.

The foregoing is entirely IMHO and IME. It is an expression of opinion and of observation.
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What you could do to verify the problem is in the DSD converter is to swap the converter outputs into your LPFs. Does the problem move with the filter or stay with the converter? if it stays with the converter then maybe that's the problem. Did you say the problem happened in passthrough mode or in conversion mode (I'm following more than one thread here :) )? If in passthrough mode then swapping DATA and LRCK going into the converter might be another test to see if the problem moves from one channel to the other.
It kinda sounds like you are suggesting there is some error in the noise shaping of one channel of the DSD Converter? If so, which channel, left or right?

Do you have an RF spectrum analyzer to verify there is some difference, or do you know somebody locally that does have one of those?

IOW how are we going to verify if there is a problem, and if there is, what the problem might be?