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modifying a large woofer into a coaxial?

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hi,

i ask this as a very vague question deliberately to get the greatest range of 'ideas' and opinions i can.

if you were to take a large PA woofer, say 18" which typically have 4" voice coils. can these be modified in such a way that allows a compression driver to be fitted and thus converted into a coax?

i'm not 100% sure on the specific construction of drivers when it comes to how the magnet fits the voice coil. does a typical driver have some sort of 'hollow' section that can be used to load a compression driver? i know there's a few PA woofers that have vented pole sections, can this be used as the initial horn section for a compression driver, then venting into an external horn section?

I have some woofers with no use now (ebay buys that didn't cut it) which i wanted to try and find some use out of.

thanks for your help.

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