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Also, for what it's worth, (this isn't a very DIY forum compatible idea ), but there are other commercial non-coax fills out there that suit your desired coverage. I used to own EAW JF60's which were great sounding little fills and have 110deg conical coverage. They are not particularly expensive - under $500 USD each, you may also find them used (IIRC I sold mine for about $250 each) - several pairs available on eBay right now. They have a passive crossover so can be run single channel.