The Gradient solution:
1. By directing more of the speakers HF and MF energy to the listener and less to the reflecting surfaces the listener hears more of the original recording and less of the room.
Three forms of controlled directivity are employed:
* Wave guide Tweeter
* Cardoid Midrange (Heart shaped response with less than 1 pct to the front wall)
* Dipole Bass (figure of 8 shaped response)
2. DIPOLE BASS (LF)
Rooms develop strong peaks and dips below 200 hz - these are determined by the three dimensions of the room ie. the Length Width and Height. The most audibly damaging node arises from the shortest room dimension, usually the floor to ceiling height.
Dipole bass stimulates bass in just one direction (the direction of driver excursion) and not the other two. In this way the speaker reduces nodes due to the ceiling height and the direction 90 degrees from the radiating direction.