18" Karlson couplers
some 18" woofers are suitable for Karlson couplers - I used a low qes low mass Eminence in a cabinet made from one 4'x8' sheet of plywood with good result. Cetec-Gauss marketed a 10 cubic foot 5181 K18 and I've posted those plans many times
a Karlson slotted tube waveguide wouldhave better vertical coverage than most horn
a slotted HF waveguide might mounted inside per Karlson's 1965 "x15"
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