I don't know if the CHR90 is much different, but it's on sale at Madisound if that helps.
https://www.madisoundspeakerstore.com/approx-5-fullrange/markaudio-chr-90-gold-151-mm/ MarkAudio CHR-90 Gold - 151 mm
https://www.diyaudio.com/community/threads/mark-audio-chr-90-ideal-frequency-response.370114/
https://www.diyaudio.com/community/threads/markaudio-chr-90.367627/
https://www.diyaudio.com/community/threads/markaudio-chr-90-new-size-full-range-driver.364014/
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