Music Reinforcement 
  The notion here is that Dipole speakers have a Null Plane
 where they don't radiate and some kinds of Microphones have Null
 notches where they don't pick up,
    SO,
  if one aligns these null planes and notches the
 GBF{Gain Before Feedback} Will improve and the sound quality will
 improve without the speakers getting into the mic. 

    The Portable sys is in the photos next to Baltic Column Cube sys.
 The Midrange Tweeter unit{MT[8" sq x 16"]} is on the tripod stand and
 the Bass unit{BU[16" sq x 9.5 deep]} is underneath with casters.

   What's different about these speakers is that they are symetrical
 dipoles, front and rear, ie, the front spectrum is the same as the rear,
 and the front & rear are 180 Out of Phase. This creates a Null Plane
 or quiet zone where the front & rear cancel off to the sides/top/bottom
 of the boxes. The Front/Rear to Side Difference is > 20db.
 For the Mid/Tweet unit this is done with back to back mids & tweets
 and for the Bass unit a single woofer in a short U frame is fairly
 symetric.

   There is a new paradigm with a Dipole Microphone, the mic is set
 up with the figure of 8 lobes pointing at the ceiling and floor,
 a vocalist sings above the plus lobe. For current dipole mics this
 means that the mic is horizontal under the chin, this is good for
 Video wherein the mic is minimum on end profile under face!  

   Picture below shows bass units back to back &
MT with back to back mids &
Dipole Mic very close to mt & b/b bass -20db in position shown.
 http://www.geocities.com/larryselmer/018_2.JPG 
Side View,  Dipole mic off to right
 http://www.geocities.com/larryselmer/017_1.JPG