Definitions for "Bipole"
A speaker that radiates in two directions in phase.
A loudspeaker system with forward and backwards firing transducers connected in the same polarity (in phase). The directional pattern is almost omnidirectional at frequencies up to a few thousand Hz, beaming slightly forward and back at the highest frequencies.
A speaker which has two sets of drivers, each facing opposite directions, that are wired in phase. This type of speaker can generate an omni-directional sound.