Fulmer's k-slotted pipe for 15"

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(N.C. Fulmer US 2787332 filed 1952 “Loud-Speaker System”) was filed about same time as Karlson's first installment of "Acoustic Transducers". Karlson used the slot in a coupled cavity cabinet and Fulmer in hopes of broadbanding a line. Fulmer said it gave a more natural sound.

this pipe looks about the size of half-horn including those by RCA-Fan

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RCA-Fan's comment on vent size
http://db.audioasylum.com/cgi/m.mpl?forum=hug&n=104845&highlight=fulmer+freddyi&session=
 
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