Horns and 2in Drivers

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.

Your profile says that you have a JBL 2426H driver.  Isn’t that a 1” exit driver?  Not that i would insist that any particular design is inherently better than another.  I like the sound of certain compression drivers and all of them are old except some ultra pricey modern drivers by the likes of Goto, Cogent, ALE and G.I.P.  Some vintage drivers I like are made by Western Electric, YL, IPC, Racon, and RCA.  As for the horns themselves, larger horns do seem to deliver more weight, authority and larger scale to the soundstage, but some of the best are incredibly large (like you can almost walk into them and hide).  
i have Western Electric 713b drivers (I am guessing 1” exit, don’t really know) and a somewhat compact KS12025 horn (rated for use down to 500hz).  I know someone using this driver on Western Electric 22A horns, which are pretty large, and that works better than my relatively small horn.