Transparency: What speakers have it in spades?

Great speakers. Dunno what you mean by transparency but a bigger three way will definitely allow you to hear much more...if that is what you are looking for.

The reason are two fold;

Experiments show that the ear can hear a maxium of 120 db of dynamic range.

Experiments show that the ear can also hear roughly 15 db below the noise floor (as long as it is random or white noise)

Assuming 10 db necessary headroom (safety margin to stay below audible distortion) and a seating position of 2 meters (6 db down); expect roughly 87 db SPL from a small two way monitor. Subtract the average calm room noise (30 db) and add the 15 db for hearing below the noise floor....and you have a dynamic range of roughly 70 DB SPL.

If you were to go to a larger three way then you might expect to comfortably get up to 105 db SPL at the listening position (with plenty of headroom and no audible distortion).

This would give you an extra 18 db of dynamic range...a significant increase that would allow you to hear more detail. Whether this is as you term "transparency" of not I am not sure....but you would definitely hear more detail from a bigger Spendor, given a good recording.

Thanks very much for your many interesting viewpoints. I appreciate it.
-Bob

I had a recommendation to make, but then I realized I was thinking of continuousness, not transparency. My bad.

Quad (even their dynamic speakers are transparent, given the price range)
SoundLab
Martin Logan
Merlin Audio
Verity Audio

Interesting that no one had mentioned JMlab.
JMlab Electra and Utopia