Audiophilepure

https://www.stereophile.com/content/mofi-electronics-sourcepoint-10-loudspeaker

We discussed the MoFi’s soft-dome tweeter, which, as well as being larger than usual for a two-way design, has a relatively large surround. Andrew explained that the surround acts as a ring radiator, emitting sound. He said that with a conventional tweeter, the surround’s output at very high frequencies may well be in the opposite polarity to that of the dome, resulting in a loss of output. “I knew I wanted a slightly larger diameter, 1.25″ rather than 1″, with a wide roll surround, because that gives you extra capability at the lower frequencies. Counterintuitively, if you put a wider roll surround on the tweeter, you actually improve HF response. You think it would interfere and cut off earlier, but it doesn’t; it actually extends it. … [T]he phases will be additive up to a higher frequency.” Andrew said the SourcePoint 10’s tweeter goes out to beyond 30kHz.

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