I was told, and posted earlier, there was no change in the apodising filter itself between 808.2 and 808.3. Instead the improvement results from:

New design and improved oscillators
Redesigned digital clocks
Reduced RF interference

These changes were reported to improve jitter which in turn improves detail and imaging, what was also called “improve the audio performance by lifting detail and further opening the image”. You should also expect to hear improved timing, particularly in the low-end.

Asa Post that was an interesting comment your reported about the 808.3 changes being the result of Bob Stuart's own listening over a period of two years and are to his personal specification. Whatever component improvements that show or not in the specifications Meridian's - Bob's - listening is an essential and reliable part of getting their product to markert.

I just noticed your new topic on 808.3 impressions. A good idea.