High Efficiency Speaker Asylum

Posted by freddyi (A) on August 14, 2007 at 09:01:53

In Reply to: RE: Da mini K posted by Kloss on August 14, 2007 at 07:17:35

did you tilt the mini-K's portboard forwards about 10 degrees? one of my fave Karlson is the first K12 form 1955 - I had a blueprint but think my kid threw it out. Its the same size and tapers (42.5" radius) as later K12 but had a reversible perpendicular port board with lip on one side plus a 3-position wood bar on the rear panel to vary its lowpass choke action - - maybe this would scale to 10" giving high cutoff but a lot of punch (?) - - I need one in mahagony "Karlsonite" to make a pair

vent was a horizontal slot 15/16" high and full-width (minus ~1.5" for two pine cleats) it wculd sing on bowed bass despite no low bass

cabinet was ~insert with 5/8" plywood outer walls laminated to 1/8" hardboard inner layer and formica outer layer - this cost big money ^~$87 in 1955)

sideview 1955 K12

Edits: 08/14/07   08/14/07