B&C 8CX21 back loaded horn?

Has anybody ever tried an 8CX21 in a back loaded horn?

https://www.bcspeakers.com/en/products/coaxial/8-0/8/8cx21

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I have a swarm of subs to fill in the low end so I do not need low extension from the horn, rather a nice upper bass performance from this box.

Thank you