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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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I've still a fewGregg Baker's Karlson Loudspeaker Discussion Forum
Realistic Reproduction Made Possible By An Exponential Coupler Of Small Dimensions
http://gaviscon2000.fileave.com/Karlson%20Enclosure.pdfDrawn by GregB Karlsonette 1954 K12 plan
Scalable Karlson pdf artwork for t-shirts or start a Karlson Klub
Waveguide
John E. Karlson live on HiFi Workbench 19648" Klam with $12 Sammie playing Steve Clarke's drum solo outdoors
JanS's curved reflector 15" Beyma coax coupler
A Few Karlson Ads
Give Lips To Your Speakers
One 4x8 Sheet Inverse Taper 15" woofer Transflex/Tapped Resonator (suggestred by "nineleaves")
Acoustic Control 115BK/KHYBOE (karlson Hypersonic Bass Operation Enclosure)
Karlson's 1965 little X15 speaker with the spectacular slotted pipe waveguideUCS1 20vrms 50Hz vs simpler and lighter K with Eminence 18" (no front shelf to offset the 1st dip)
KARLSON AND KARLSON-RELATED SPEAKER PATENTS
RELATED:
W.O Swinyard US 2020166 filed 1935 Sound Reproduction Apparatus - a wedge-shaped 20 degree cavity with V-deflector having non-parallel walls ="Proto-Karlson"
N.C. Fulmer US 2787332 filed 1952 Loud-Speaker System - a folded 1/4 wave pipe with last section broadbanded with tapered slot - Fulmer’s patent apparently conflicted with Karlson's 1st Acoustic Transducers and action by RCA & Olson delaying grants. story goes that Karlson won over RCA producing earlier lab notes than Olson.
R-J Enclosure:
(1) "The R-J Speaker Enclosure" by William Joseph and Franklin Robbins. Published in Audio Engineering Magazine December 1951.
(2) "Practical Aspects of the R-J Speaker Enclosure" by William Joseph and Franklin Robbins. Published in Audio Engineering Magazine January 1953.
"Acoustic System for Loud-Speaker" US# 2694463; Robbins et al filed April 17, 1952 granted 11/54
(btw - nephew of William = Jeff Joseph's Loudspeakers: http://www.josephaudio.com/)
J.J. Baruch US2766839 "Loudspeaker System" Filed March 16th 1953, granted Oct. 16th 1956 - deals with math of distributive resistive vents using round holes
FWIW Marty Poppe built X15 using 42-0.375" holes to damp the system for a particular 15" woofer.
John A. McKenzie US 3590941 filed 1969 Speaker Enclosure- a dual mouth K-coupler like stacked Asymmetric-Projector having a final deflector at each mouth
Robert W. Reams US 4196790 filed 1978 Acoustic Transducer having Multiple Frequency Resonance- novel use of Karlson's slot to create a broad-banded throat in a PA-application quasi-scoop horn with sealed back chamber - Gregory Raw termed it a Sci-fi-scoop
Rodden, M. Raymond US 4313521 filed Feb. 2 1982 "Speaker Housing"
Weiss et al US 5943431 August 24, 1999 Loudspeaker With Tapered Slot Coupler And Sound Reproduction System - basically a wedge-shaped asymmetric projector waveguide for 1 inch format compression driver
KARLSON PATENTS:
J.E. Karlson US 2586827 Directive Radiating System Filed March 31 1945 -
Parabolic dish microwave antenna with what appeared to be a variable directivity patternJ.E. Karlson Acoustic TransducersUS 2816619 filed Dec. 1951, granted 6 years later - deals with broadbanding slot both in loudspeakers and musical instruments.
J.E Karlson Acoustic System US 2896736 filed Aug. 1955 - use of a modified Karlson laying on its back using either corner or wall to create a diffused sound image - HiFi
Lit's website shows a K12 used in this fashion (laid on back) on the 1955 Karlson brochure page and The Audio League reported on it October 1954
J.E. Karlson Open End Waveguide Antenna US 3445852 filed 1968 - essentially analogous with the K-tube waveguide used in Karlson's X15 2-way speaker ~1966.
J.E. Karlson Acoustic Transducers- US 3540544 filed 1968 - concurrent with X15 and described Karlson's use of ellipse based reflectors to improve the Ultra-Fidelity type via
Fig.6 and Fig 8's reflectors (Fig6 upper reflector was used in the X15) and introduced the Asymmetric Projector with tapered ellipse profile which appeared commercially as the AP-9C ceiling speaker - also- slotted mircrophones were
discussed.
J.E. Karlson Jet Engine Silencer Nozzle...) US 3543876 filed 1968 - jet engine muffler and rocket nozzles.
Subject: List of John's Inventions 4-24-1950 courtesy of Marty Poppehope typed this OK (#8 was difficult to read) - note #11 & #16 as they relate to our fave loudspeakers
LIST OF INVENTIONS 4/24/50
J.E. (Edward) Karlson
1. ELECTRONIC POTENTIOMETER. A variable element which is capable of linear variations of resistances with infinitesimal
mechanical motion yet also have capabilities of broad variations in resistance.
2. CAPLESS DISPENSING TUBE. This device permits the use of toothpaste tubes, etc. without the necessity and bother of
removing and replacing the cap after each usage.
3. GEOLOGICAL PROSPECTING SYSTEM. A system for use in the prospecting for oil, minerals, etc.
This system may also be used for radar applications.
4. RADAR ANTENNA WITH AUTOMATICALLY VARIABLE BEAM PATTERN. This invention provides a simple means
of automatically changing the beam pattern of a radar antenna from a pencil beam to a cosecant beam.
5. DIELECTRIC ANTENNA. This invention provides a technique for designing commercial and military antennas which will have
overall dimensions than conventional antennae, and yet have equivalent gain and directivity characteristics.
6. BRUSHLESS DC MOTOR
7. ASHTRAY. An extremely simple design for an ash tray which quickly extinguishes cigarettes.
8. PRECISION DELAY CIRCUIT. This circuit provides a delayed pulse at a precise interval following an initial pulse.
9. CHATTERLESS CONTACTS FOR RELAYS
10. TELEVISION ANTENNA. This invention provides a simple, low cost antenna which can be readily hidden or obscured
in the average room and is suitable for both F.M. and television.
11. SLOT ANTENNA. This design provides a slot antenna with broad band matching possibilities.
Karlson Evangelist
Edits: 02/03/10
This post is made possible by the generous support of people like you and our sponsors:
Topic - Karlson Kount #1 2010 - freddyi 17:27:34 02/03/10 (0)
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