Okay let's look at the Audicom clock mod. Is it just the clock that they change out or is there more to it?
https://i.imgur.com/bEvsjJ1.jpg
That's a lot of gubbins. I've got CD players with less gubbins than that in total. So what does it include?
Not only are three separate high precision regulators on the PCB, a large number of Sanyo Os-Con's and Black Gate's latest Capacitors support the Circuitry. The Board uses more than just the usual two layers and everything has been optimised to the highest degree possible. This extends to the Wiring on the clock output that is high purity Silver, chosen over coax cable after extensive tests.
Now I know we both agree that changing the value of a component, or even keeping the value the same and changing it for one of a different material construction, can change the sound. So given that this is not simply swapping the crystal out for a better one how can you say for certain that it is reduced jitter that is responsible for the sound of the player being different after the mod? This looks like a whole raft of changes and boutique components.
Given that you have no before and after jitter measurements and given the findings of the AES study that shows jitter has to be at high levels before we can hear it, and given that Sony were unlikely to have overlooked jitter reduction in their flagship DAC and transport combo, can you really still say for certain that the differences you heard were due to a reduction in jitter? Or would you now agree that there are more variables involved than you had previously considered?