P.I.S.S.? Yeah I can see why marketing didn't like it.Powered Integrated Super Sub
It actually sounds pretty cool though when not reduced to an acronym.
So you grok my hunch that it adds more punch.
I can easily believe that a reverb tail would be globular.
I use a 'scope in X-Y as a vectorscope.
There is a free software Vectorscope here though not VST: http://www.satsignal.net/
I've used it but prefer the 'scope.
I did find an internal soundcard mixer gain error (rotation) with it though.
Had been wondering why it was always a little right-heavy.