From my experience in designing loudspeakers, I personally believe there is a very strong correlation between the IMD performance and some subjective feelings like "Transparency" and "smoothness". It makes sense as IMD is noise and it's inharmonic to the original content.
When comparing the Cadentia 3 and the Fidelia side by side, the first thing that others and I notice is that, although their tonality is very similar, the Cadentia 3 simply sounds cleaner and smoother, and this becomes more obvious at higher SPLs. Back in my time at KEF, I felt the same when comparing the 2-way and the 3-way models too.
By the way, I have made really good progress on producing the first batch (10 sets) of Cadentia 3 orders! They will be shipped this week! And sorry for my delay in email reply recently, I am just completely overwhelmed

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