Phasing Plug Aperture Patterns for Compression Driver Acoustic Optimization

The phasing plug surface is contoured to be substantially spherical and conform to the diaphragm surface, creating a curved compression chamber that optimizes acoustic wave propagation while maintaining adequate spacing. The spherical curvature allows the compression chamber height to be reduced without creating flat surfaces that would cause standing waves, while the gradual curvature prevents collision risk by distributing the acoustic pressure evenly.

The phasing plug incorporates both concentric circular slots (symmetric pattern) and non-circular slots including rectangular and triangular patterns (asymmetric patterns). The asymmetric non-circular slots disrupt the symmetry of acoustic wave propagation, preventing the formation of standing waves at high frequencies while the concentric circular slots maintain acoustic impedance matching. This combination of symmetric and asymmetric patterns resolves the contradiction between impedance matching and standing wave suppression.

The spherical contouring of the phasing plug and diaphragm creates a compression chamber with optimized volume distribution. The curved geometry allows the compression chamber to have sufficient volume to reduce high-frequency attenuation while maintaining a compact overall size. The spherical shape distributes acoustic pressure evenly throughout the chamber, preventing localized compression that would cause nonlinear distortion, while still providing adequate volume for high-frequency signal transmission.