Audiophilepure

https://www.stereophile.com/content/mofi-electronics-sourcepoint-888-loudspeaker

The crossover between the midrange and woofers is set to 130Hz; that between the midrange and the coaxially mounted 1.25″ soft-dome tweeter is at 1.6kHz. The tweeter therefore operates over a wider passband than usual. When I interviewed Andrew Jones for my SourcePoint 10 review, he explained that the coaxial unit’s lower-frequency cone acts as a waveguide for the tweeter. The waveguide reduces the tweeter’s excursion requirement, so it can be operated down to a lower frequency than would be possible if it lacked a waveguide. With a waveguide, “the improvement in efficiency or sensitivity and the reduction in excursion more than make up for the fact that you’re crossing over at 1.6k. It enables you to get a very good progressive, consistent off-axis performance,” Jones told me, adding that using a dome with a slightly larger diameter, 1.25″ rather than the usual 1″, with a wide roll surround, provides extra dynamic range capability at the lower frequencies.

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