Line source loudspeakers are well known in professional audio: they give a good spread of sound laterally but have tightly controlled directivity in a vertical sense. The Pearl linear microphone capsule has some similar properties, though this is not its only advantage.
Conventional microphone capsules are round. It’s an easy shape to make consistently, but it has one significant disadvantage in that its high degree of symmetry makes the primary resonance quite pronounced. Damping can reduce some of the ills caused by that resonance, but it is still there and most often well within the audio band.
For more information please visit the Pearl website.