Re: Interesting idea! - - Poppe - freddyi - High Efficiency Speaker Asylum

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Re: Interesting idea! - - Poppe

In Reply to: Re: Interesting idea! posted by TubeCraft on March 20, 2007 at 06:44:13:

I can't work the calculus and not sure if a long slotted pipe would be of value (?) Look at Poppe and Karlson's couplers - they all have wedge shapes narrowing in volume as the slot flared including Poppe's unpublished stereo coupler and Karlson described why in his first "Acoustic Transducers" patent.
Robert Reams (president or Neural Audio) had a variation.
from my little bit of play, regular K have good merit within certain bulk constaints using higher efficiency low-mass driver

John Karlson's 12 foot klam

Robert Reams Karlson-Hypex

KARLSON AND KARLSON-RELATED SPEAKER PATENTS
RELATED:
W.O Swinyard US 2020166 filed 1935 “Sound Reproduction Apparatus” - a wedge-shaped 20 degree coupler with “V” deflector
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 RCA/Olson delaying grants on both. Karlson produced the earliest lab notes.
R-J Enclosure (not really related but thown in for good measure - haha)
(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
(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 - 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.
Rodden, M. Raymond US 4313521 filed Feb. 2 1982 "Speaker Housing"
Sapkowski September 3, 1996 "Exponential multi-ported acoustic enclosure" United States Patent 5,552,569

Weiss et al US 5943431 August 24, 1999 “Loudspeaker With Tapered Slot Coupler And Sound Reproduction System” - basically a wedge-whaped asymmetric projector waveguide for 1” compression driver
KARLSON PATENTS:
J.E. Karlson US 2586827 “Directive Radiating System” Filed March 31 1945 - a
Parabolic dish microwave antenna with what appeared to be a variable directivity pattern

J.E. Karlson “Acoustic Transducers” US 2816619 filed Dec. 1951, granted 6 years later - deals with broadbanding slot both in loudspeakers and musical instuments.
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
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-Fidlety type via
Fig.6 and Fig 8’s reflctors (Fig6 upper reflector was used in the X15) and introduced the Asymmetric Projector with tapered elipse profile which appeared commercially as the AP-9C ceiling speaker - also- slotted mirocphones were
discussed.
J.E. Karlson “Jet Engine Silencer Nozzle...) US 3543876 filed 1968 - jet engine muffler and rocket nozzles.

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.
12. HYBRID WAVEGUIDE JUNCTION. This is a wave guide section which has variable propagation characteristics dependant upon the direction of propagation.
13. R.F. TUNER. a simplified tuner for F.M. and television use.
14. ADVERTISING SIGN. Novel electric sigh with quick change possibilities.
15. LIGHT VALVE FOR TELEVISION PROJECTION AND PICKUP TUBE.
16. ACOUSTIC TRANSDUCER. A novel loudspeaker enclosure with improved matching characteristics and controlled reverberation.
17. FISHING DEVICE
18. TELEPHONE AMPLIFIER WITH SPECIAL ACOUSTIC CHARACTERISTICS

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Follow Ups Full Thread

Topic - The Karlson technique has failed - freddyi 19:36:44 03/18/07 (10)

y'know, freddyi, your enclosures are making me think more & more of Georgia O'Keefe :-) - mhardy6647 13:14:32 03/19/07 (4)

LMAO - Dr Deville 17:43:39 03/19/07 (1)

Re: LMAO - accessories - freddyi 18:21:42 03/19/07 (0)

Re: y'know, freddyi, your enclosures are making me think more - "gigs" ? - freddyi 14:02:50 03/19/07 (1)

I'd hit that... - Godzilla. 20:41:06 03/19/07 (0)

Re: The Karlson technique has failed - TubeCraft 06:38:15 03/19/07 (3)

Interesting idea! - hollowboy 00:04:52 03/20/07 (2)

Re: Interesting idea! - TubeCraft 06:44:13 03/20/07 (1)

Re: Interesting idea! - - Poppe - freddyi 08:58:56 03/20/07 (0)

any go with the boffle ? nt - snkby 22:22:17 03/18/07 (0)

Follow Ups

Re: Interesting idea! - - Poppe - freddyi 08:58:56 03/20/07 (0)

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