Coaxial drivers emit the whole spectrum from one point, minimizing inter-driver comb filtering

Coaxial (dual-concentric) monitors nest the drivers so the entire frequency range emerges from a single point, minimizing comb filtering between drivers, improving off-axis tonality, and sharpening stereo imaging. The author is explicit that ordinary physically separated drivers do not fundamentally prevent dependable pro-grade mixes, so budget-conscious engineers need not pay a premium for coaxial designs except on personal preference.

Examples

A Tannoy dual-concentric fires the tweeter through the centre of the woofer cone so both sources align acoustically, unlike a conventional two-way with the tweeter offset above the woofer.

Assessment

State the acoustic advantage of a coaxial monitor over a conventional two-way, and the caveat the author gives about paying extra for it.