rear firing tweeters....

Sonus Faber seems to like the idea.

The explanation I heard was to balance out the speaker's power response such that the tonal balance of the room reflected sound better matched the direct sound at the listening position. A rear firing tweeter is not the only way to achieve this goal.

I meant VR-2 my mistake and apology. It does have a volume potentiometer as mentioned above, but it's functional range is very limited and on the low side.

Your Maggies are dipoles. Not better, not worse, per se, but certainly different than a pair of tweeters separated by 12" or so and firing in or out of phase.

One nice thing about dipoles is the null at 90 degrees, which can reduce sidewall effects. Everything is a tradeoff. I just don't necessarily buy the idea that a rear-firing tweeter solves enough problems to offset those it causes, but of course, we're talking about engineering here, which is as much a balance of compromise as anything else.

Nice speakers, those Maggie 3.6!