Von Schweikert "rear ambiance driver" revisited

Rob,
Agree. I found that after break-in the rear ambience tweeter really seemed to open up the soundstage, but at the expense of slight bright or forward presentation. I felt that the VR2 is a forward sounding speaker anyway, which is not a bad thing..just not to my liking afterall. There is forward and bright or harsh and then there is a upfront presentation that the VR2's exhibit which works well for the speaker...But getting back to the rear tweeter, I eventually used quite a bit of front wall absorbers and diffusers as well as corner diffusers for bass and got the sound very smooth, but still found that with the rear tweeter level above about 1...I could here a brightness to the upper end. Im not at all sure what the answer is, as your right in pointing out that there is no set guide for setting the level..I think Albert's intention was to use it variably and set it where it best sounds in your set up under your listening conditions..i.e..room, equip, etc.
For me..I made the choice to move into another speaker which I felt was more dynamic, didn't compress as much under power, and is less forward to my ears. YMMV..Best-Ken

I demoed the VR-4 Gen III SEs and I also felt that the ambience tweeter needed to be nearly "off". Didn't notice what #it corresponded to, but less was definately more, in this case.

I agree I keep my vr2 at 6 but i use tubes and it is not fatiging