rear firing tweeters....

I have a pair of VS2 Von Scheickerts which do have an "ambience tweeter/?high midrange " driver. It does see to add space to the sound but not much more so than a good tube output power amp qould ( I use both). It doesn't seem to hurt that's for sure. My main speakers, in a different rig, have better 3D halography (Focals) and don't have them. From that little experience I conclude they are not needed in all cases, the VS may be making up for a particular issue of their own.

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.