Jeffrey,
Here I pen this rather long response and didn't even address your particular areas of interest (I've been a bit foggy lately...)
Anyway, comparing the single BEN with Duos and other AGs I've heard: soundstage--Cains cast a deep stage that's only as wide as the speakers. Highly detailed and textured as I said before. AGs may have more detail and offer a wider stage that can come forward of the speaker but does not extend back as far. Balance--AGs have far more range and don't have the Cain potential for peakiness (the Fostex is a bit Lowtheresque this way--but no wizzer to make it worse), but from lower mid to upper bass the Cains are just one driver and don't rely too much on the BLH so they are better balanced here. The transition from mid to high on the AGs didn't stand out, but on the Cain's it's a sweeter range. Coloration--Cain has a few areas where it audibly puts it signature. Chestiness in male singers, and boominess in bass if near boundaries, and a definite sound of the Fostex driver that's otherwise hard to describe. The AGs from a technical standpoint are far less colored, but they too have a definite sound. The sound is more of a front loaded horn which puts the stage and singers front and center.
There's a reason why cliches are such--you really should hear both before you buy if you can. Best of luck.
Here I pen this rather long response and didn't even address your particular areas of interest (I've been a bit foggy lately...)
Anyway, comparing the single BEN with Duos and other AGs I've heard: soundstage--Cains cast a deep stage that's only as wide as the speakers. Highly detailed and textured as I said before. AGs may have more detail and offer a wider stage that can come forward of the speaker but does not extend back as far. Balance--AGs have far more range and don't have the Cain potential for peakiness (the Fostex is a bit Lowtheresque this way--but no wizzer to make it worse), but from lower mid to upper bass the Cains are just one driver and don't rely too much on the BLH so they are better balanced here. The transition from mid to high on the AGs didn't stand out, but on the Cain's it's a sweeter range. Coloration--Cain has a few areas where it audibly puts it signature. Chestiness in male singers, and boominess in bass if near boundaries, and a definite sound of the Fostex driver that's otherwise hard to describe. The AGs from a technical standpoint are far less colored, but they too have a definite sound. The sound is more of a front loaded horn which puts the stage and singers front and center.
There's a reason why cliches are such--you really should hear both before you buy if you can. Best of luck.