Horns and 2in Drivers

Sure its a common size for compression midranges 

Yes Klipsch 1132 drivers on K-402 horns and they are stellar.  2" drivers are light years ahead of smaller ones in every way. By the way the crossover point for these is set to 450hz and it has no issues at all doing this. You want to play at real live concert levels bump it up to 500hz and have a good ear doctor because you will need him.

the B&C unit uses a 2" voice coil coupled to a 5" (paper composite) diaphragm, much the same way as the RCA MI-1428 field coil driver of yore (build from the late 1920’s, if I’m not incorrect), the vintage driver B&C has sought to more or less replicate with the DCM50. As implemented in my speakers the sonic result is wonderfully uninhibited, unflappable (at any SPL), insightful, and naturally warm.

Much of my source material (uncompressed CD track rips; no SACDs or vinyl), are 60s pop, r&b and soundtracks, which were often victims of excessively applied compression. And some tracks during multi-vocal passages and when orchestrations get busy sound “congested”; possibly due to poor miking/baffling (??). So, while not outright crappy (??), much of my music was certainly less than pristinely recorded and/or mastered, even though almost all were issued by major labels.

Therefore, how enjoyable or "listenable" would beryllium drivers, especially like https://josephcrowe.com/blogs/news/...river-test-review?_pos=3&_sid=e989429b4&_ss=r make much of my recordings?

Ditto this beryllium https://www.usspeaker.com/radian 745neoBepb-1.htm , though which doubtless Pierre had perfectly EQed? See posts #15,266, 15,276. https://www.diyaudio.com/community/threads/beyond-the-ariel.100392/page-764

Might you instead recommend the "neutral" sounding Yamahas JA6681B aluminum, with beryllium support "fingers". https://www.youtube.com/watch?v=0LMJ-vbxIxA&t=358s

Or the perhaps more likely the "warm" sounding B&C DMC50 paper cone?
https://www.diyaudio.com/community/threads/critical-midhorn-build.172704/page-5
https://forum.audiogon.com/discussions/horns-and-2in-drivers/post?postid=1779050#1779050
 

And @ 17:29 to 25:01here?  https://www.youtube.com/watch?v=8haDt66kueM&t=1041s

 

If by 2", you mean the diameter of the diaphragm, I utilize such drivers.  I run a pair of Western Electric 713b drivers feeding a KS 12025 sectoral horn.  This is a great sounding combination.  The Western Electric 555 field coil drivers also have 2" diaphragms and sound good.  Yoshimura Laboratory compression drivers that are attempts at copying Western Drivers also sound very good.

It’s confusing when compression driver size is mentioned without specifying whether exit or diaphragm diameter is meant.

What I can reiterate is that a 2" exit compression driver (with a bigger diaphragm as well - usually 3 or 4") makes a significant difference for a given bandwidth compared to not least a 1" exit driver with a comparably smaller diaphragm. A 2" exit driver with a fitting horn can be crossed lower with much lower distortion, and just sounds more effortless, naturally full, clean and visceral. The sheer energy and unforced presence such a driver can produce is staggering, and importantly it comes in handy at lower SPL’s as well, so it’s not as much about low distortion monstrous output capabilities as it is perceived sonics at more "normal" listening levels. Bigger exit compression drivers however eat away of the usable HF-register, and thus - depending on their implementation and specific iteration - can necessitate a separate compression driver tweeter with a fittingly smaller exit diameter. Bigger exit CD’s + fitting large horns also, energy-wise, cross more smoothly to larger woofer sections below, and prevents them from being pushed to high in frequency at the crossover. Being habitually exposed to such a combo makes it hard, if not impossible to go back to smaller exit-diameter compression drivers, I find.