After disappointing results of some super-tweeters, and the terrific results the Beyma CP22 gave me, I decided to buy the sibling version CP21.

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Both CP22 and CP21 share the same diaphragm and same strong ferrite motor. The CP22 has a bullet horn, while the CP21 has a diffraction slot, which provides wider horizontal coverage, but has some time domain anomalies and less linear frequency response. Whilst the CP21 requires additional equalization, the payoff is a wider coverage.

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The measurements are below.