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23rd April 2007, 02:46 PM
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diyAudio Member
Join Date: Aug 2005
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Fulmer's k-slotted pipe for 15"
(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 article Pg1 http://img455.imageshack.us/img455/8639/ful11oy.jpg Pg2 http://img455.imageshack.us/img455/2694/ful20tm.jpg Pg3 http://img455.imageshack.us/img455/5733/ful37mu.jpg Pg4 http://img451.imageshack.us/img451/8349/fuld3px.jpg RCA-Fan's comment on vent size http://db.audioasylum.com/cgi/m.mpl?...eddyi&session= |
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