Supertweeter CTC distances

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Standard recommendation is CTC distance no more than one wavelength at crossover freq.

3kHz => 4.5in/114mm
5kHz => 2.7in/69mm
10kHz => 1.35in/34mm

Under most circumstances, such CTC distances would be impossible, are there mitigating factors with having such a high crossover frequency? I have googled and searched here, no specific mention of this topic.
 
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