INNOVATIVE PATENTED TRANSDUCER TECHNOLOGY
Described compactly, a BMR is the practical realization of the ideal acoustic radiator; a free, flat disk driven by a perfect force. This ideal radiator has flat on-axis SPL and a smooth, extended sound power response (SWL).
Unfortunately, there is no such thing as a perfect force and to drive the disk a voice coil must be added which introduces mass. A BMR balances for the effect of the added voice coil mass and recovers the ideal radiator performance.
At low frequencies the diaphragm moves as a rigid piston, but at higher frequencies the diaphragm becomes modal (modes are standing wave vibration patterns). This carefully controlled modal behavior, superimposed with the underlying piston movement, ensures that the drive unit does not ‘beam’, maintaining wide directivity up to the highest frequencies.