coupled cavity device with indirect radiation. no real gain above a point. chance of holes in response/firewood (& Kerosene)
hit region on some coupler could be good. cone excursion can be low for relatively high outputs vs reflex or even some horn.
had horrible-horrible sound on some - some k-coupler = "pretty good"
vent placement and slot opening (especially in upper half of couler) can affect "tone"
a rear lowpass board giving ~0.2-0.38Sd was sometimes used to improve large signal transient response
3rd Z peak might be of interest and can occur ~135-160Hz for K15 size coupler, ~225Hz for X15 size (~1 cubic foot front chamber)
smaller couplers might be tricker
not much dialogue on Karlson=type and examples appears to pop up more in Europe than US.
any k activity?
hit region on some coupler could be good. cone excursion can be low for relatively high outputs vs reflex or even some horn.
had horrible-horrible sound on some - some k-coupler = "pretty good"
vent placement and slot opening (especially in upper half of couler) can affect "tone"
a rear lowpass board giving ~0.2-0.38Sd was sometimes used to improve large signal transient response
3rd Z peak might be of interest and can occur ~135-160Hz for K15 size coupler, ~225Hz for X15 size (~1 cubic foot front chamber)
smaller couplers might be tricker
not much dialogue on Karlson=type and examples appears to pop up more in Europe than US.
any k activity?
hey freddy....long time no talk since the K forum went down. anyway, i never finished mine over the summer and then i had to go back to school...besides, my university house probably doesn't have the room for a pair of K15s. I'm stuck with my trusty old Wharfedales for now.
I got a little intimidated by crossover design and sensitivity matching with compression drivers so i decided i would triamp. i am going to be covering the mids with an original spec Smith Horn and might try a K-tube for 5-8khz on up. power'll be provided by a fully regulated LM3875 dual mono gainclone for the woofs, and a pair of modded T-amps for mids and highs. how have your experiements been? and health?
I got a little intimidated by crossover design and sensitivity matching with compression drivers so i decided i would triamp. i am going to be covering the mids with an original spec Smith Horn and might try a K-tube for 5-8khz on up. power'll be provided by a fully regulated LM3875 dual mono gainclone for the woofs, and a pair of modded T-amps for mids and highs. how have your experiements been? and health?
I'm thinking about them. Been re-reading Poppe's short paper recently. Wonder what Martin would make of it -I'll have to ask him.
I'd love to play with Karlson enclosures at some point. Maybe drop some 201s into one of the 12in designs out of interest & see what happens. Any thoughts?
I've got some other dark plans afoot, but it depends if I can figure out how best to size / tune the coupler to a specific frequency more accurately than I can at present. I don't like trial and error as I don't have the time, facilities or the money to do physical experiements, so I prefer to use computer modelling based on solid formulas initially.
I'd love to play with Karlson enclosures at some point. Maybe drop some 201s into one of the 12in designs out of interest & see what happens. Any thoughts?
I've got some other dark plans afoot, but it depends if I can figure out how best to size / tune the coupler to a specific frequency more accurately than I can at present. I don't like trial and error as I don't have the time, facilities or the money to do physical experiements, so I prefer to use computer modelling based on solid formulas initially.
Hi Scottmoose
I'm not faimilar with 201
a Karlson coupler probably should have hard finish in the front chamber to aid with "reverb". This gives them (on a good day/recording)) a more live and palpable character than direct radiator The effect is adjusted by baffle angle, slot gap at top, coupler width, wings taper.
according to one builder, slot's inductance is one part of the low prequency behavior and that rough model might be in Karlson's 1952 Audio Engineering article.
the original Karlson with good 15" coaxial is not a shabby thing and can play good kick drum and bowed bass which seem to be sticking points for reflex..
I don't have saw, etc to build new test-couplers. A few variants were built and I tested 32x16x21 coupler with 23 degree baffle and 10 degree port board using 15 and 18. RTA is nearly useless besides seeing general LF.
a new test-mule k-coupler should have removable wings and other adjustments available. The upper board may have some forwards cant and an upper reflector might be of benefit .
there will be very little damping in the rear chamber and damping beyond this can kill the sound..
drivers with weak power response like B20 are not suitable.
I don't know how good small coupleres might be made.
besides MJK, Martin Poppe is very alive and well and would converse on Karlson.
K15 was finalized in the summer of 1951 and had 30 degree baffle tilt, dimensions of 33x18x18 (possibly 17 depth for first model), ~40 sq.in. vent and a front deflecting board to partially cancel a 250Hz null. This board never appeared in smaller coupler.
here's a couple of coupler built by Carl N. for look at aspect which might be tried
8" Fostex coupler by CN - later had thicker panels due to flex and Carl probably ran slot all the way up with "V" above the ~1/2" aperture gap
http://img515.imageshack.us/img515/2993/hak8rp6.jpg
10" test coupler by CN about 10 years ago - later would have "V" extenstion
http://img204.imageshack.us/img204/3562/testbox1jpgmi8.jpg
my 18"K with de-Q-ing V slit
http://img524.imageshack.us/img524/9977/kleer1ww8.jpg
if you have a strong and good 15" coaxial then K15 might be a good start and fun. Then see if it could be "beat" within the same bulk as maxium.
K15 plans
http://home.earthlink.net/~buddhaboy2/K15.PNG
hi bikehorn - dunno - hope i make it
I'm not faimilar with 201
a Karlson coupler probably should have hard finish in the front chamber to aid with "reverb". This gives them (on a good day/recording)) a more live and palpable character than direct radiator The effect is adjusted by baffle angle, slot gap at top, coupler width, wings taper.
according to one builder, slot's inductance is one part of the low prequency behavior and that rough model might be in Karlson's 1952 Audio Engineering article.
the original Karlson with good 15" coaxial is not a shabby thing and can play good kick drum and bowed bass which seem to be sticking points for reflex..
I don't have saw, etc to build new test-couplers. A few variants were built and I tested 32x16x21 coupler with 23 degree baffle and 10 degree port board using 15 and 18. RTA is nearly useless besides seeing general LF.
a new test-mule k-coupler should have removable wings and other adjustments available. The upper board may have some forwards cant and an upper reflector might be of benefit .
there will be very little damping in the rear chamber and damping beyond this can kill the sound..
drivers with weak power response like B20 are not suitable.
I don't know how good small coupleres might be made.
besides MJK, Martin Poppe is very alive and well and would converse on Karlson.
K15 was finalized in the summer of 1951 and had 30 degree baffle tilt, dimensions of 33x18x18 (possibly 17 depth for first model), ~40 sq.in. vent and a front deflecting board to partially cancel a 250Hz null. This board never appeared in smaller coupler.
here's a couple of coupler built by Carl N. for look at aspect which might be tried
8" Fostex coupler by CN - later had thicker panels due to flex and Carl probably ran slot all the way up with "V" above the ~1/2" aperture gap
http://img515.imageshack.us/img515/2993/hak8rp6.jpg
10" test coupler by CN about 10 years ago - later would have "V" extenstion
http://img204.imageshack.us/img204/3562/testbox1jpgmi8.jpg
my 18"K with de-Q-ing V slit
http://img524.imageshack.us/img524/9977/kleer1ww8.jpg
if you have a strong and good 15" coaxial then K15 might be a good start and fun. Then see if it could be "beat" within the same bulk as maxium.
K15 plans
http://home.earthlink.net/~buddhaboy2/K15.PNG
hi bikehorn - dunno - hope i make it
Freddi,
I think it's a lack of understanding of exactly what that vent shape does that holds back their popularity. Steve Deckert has use the Karlson slot shape with success on a couple of designs. As you know, I've even used it for a different reason, which seems to work.
With the examples you give that it works well for a 15, but not with smaller drivers, that tells me it's just not understood enough to optimize the design for different size drivers. Maybe what is needed is to get back to basics and start with what it does in simple terms.
For example, I use a K-slot on the side of a short pipe. When I put my ear near the point of the slot, I hear only higher frequency content and more balanced content where the slot is wider. Does a K-slot just act as a different size BR vent with the effective size dependent upon frequency?
I think it's a lack of understanding of exactly what that vent shape does that holds back their popularity. Steve Deckert has use the Karlson slot shape with success on a couple of designs. As you know, I've even used it for a different reason, which seems to work.
With the examples you give that it works well for a 15, but not with smaller drivers, that tells me it's just not understood enough to optimize the design for different size drivers. Maybe what is needed is to get back to basics and start with what it does in simple terms.
For example, I use a K-slot on the side of a short pipe. When I put my ear near the point of the slot, I hear only higher frequency content and more balanced content where the slot is wider. Does a K-slot just act as a different size BR vent with the effective size dependent upon frequency?
Hi John - from what little reports, CN"s 10" coupler bsaed on box above was good and he kinda liked 208 sigma in high aspect k8. C-N feels taller/narrower aspect could be of advantage.
I'm not a good carpenter and lack tools/skills to to nice work
here's a 5" k built by C-N's son based on Karlson's little "Rocket"/asymmetric projector - may sport a k-tube from coaxial's dome
angles on coupler's taper look like 6 & 12
maybe someone besides C-N will eventually look at various Karlson and Fulmer & perhaps from a different viewpoint. C-N may offer some info in the future and has worked with K's for a long time.
a K10 should be able to pack a good whallop - I didn't have a grat small coupler going scale with Emiennce 10cx but doesn't mean someone esle might do somewhat better - although rough, mine played strong.
for K10 one might try 14 x 27 13 or so ?
Best,
Freddy
ps a few patents related plus Karlson's stuff
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 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 RCA . One story says RCA and Olson went against Karlson and JEK won producing the earliest lab notes.
R-J Enclosure (just for a reference of what was happening in those days)
(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
J.J. Baruch US2766839 "Loudspeaker System" Filed March 16th 1953, granted Oct. 16th 1956
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..
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”
KARLSON PATENTS:
J.E. Karlson US 2586827 “Directive Radiating System” Filed March 31 1945 - a Parabolic dish microwave antenna with 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
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.
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
I'm not a good carpenter and lack tools/skills to to nice work
here's a 5" k built by C-N's son based on Karlson's little "Rocket"/asymmetric projector - may sport a k-tube from coaxial's dome
angles on coupler's taper look like 6 & 12
An externally hosted image should be here but it was not working when we last tested it.
maybe someone besides C-N will eventually look at various Karlson and Fulmer & perhaps from a different viewpoint. C-N may offer some info in the future and has worked with K's for a long time.
a K10 should be able to pack a good whallop - I didn't have a grat small coupler going scale with Emiennce 10cx but doesn't mean someone esle might do somewhat better - although rough, mine played strong.
for K10 one might try 14 x 27 13 or so ?
Best,
Freddy
ps a few patents related plus Karlson's stuff
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 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 RCA . One story says RCA and Olson went against Karlson and JEK won producing the earliest lab notes.
R-J Enclosure (just for a reference of what was happening in those days)
(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
J.J. Baruch US2766839 "Loudspeaker System" Filed March 16th 1953, granted Oct. 16th 1956
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..
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”
KARLSON PATENTS:
J.E. Karlson US 2586827 “Directive Radiating System” Filed March 31 1945 - a Parabolic dish microwave antenna with 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
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.
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
Freddi,
What I need is the simple physics, and I don't need the math, leave that to the math guys. eg Drop and apple it falls. Drop it from higher at it is going faster when it gets to the ground. It doesn't take much trial an error to drop it so it hits someone on the head who is walking by, despite the fairly complex math that we get a feel for intuitively. With Karlsons, I don't think the numbers guys have been able to reduce their behavior to the math, so they don't have much interest. How about starting from a different viewpoint? In simple terms, what do the darn things actually do?
What I need is the simple physics, and I don't need the math, leave that to the math guys. eg Drop and apple it falls. Drop it from higher at it is going faster when it gets to the ground. It doesn't take much trial an error to drop it so it hits someone on the head who is walking by, despite the fairly complex math that we get a feel for intuitively. With Karlsons, I don't think the numbers guys have been able to reduce their behavior to the math, so they don't have much interest. How about starting from a different viewpoint? In simple terms, what do the darn things actually do?
karlson are coupled cavity devices with flared aperture which opens as the wedge shaped chamber's volume is going to zero.
Karlson's first "Acoustic Transducers" patent from the early 1950's give his explanations so that might be a start to understand.
Karlson having speaker back iin chamber add a type of "reverb" which by K's reasoning was desirable to enhance reallism - K15 can sound pretty good.
any driver external to the cabinet will change the mix and some builders like horn on top (or open baffle as in Magnetar's "Rosie" klam with 2-170MO and tweeter)
vented originals (K15/K12 then K8) ran ~2:1 rear chamber over front chamber volume ratio.
with strong motor and light cone, Karlson seem to damp cone excursion on hard transients
I think the LF vs T-S may roughly follow a bandpass simulation. IIRC their 3rd Z peak comes in around 300/225/160Hz as size goes down from K15-K12-K8 - - if one made a rouhd or rectangular hole roughy the size of a K's aperture then would guess the result would be a high tuned bandpass enclosure. Are Karlson more than that?
a tapered slot on a pipe might effectively shorten the pipe (a guess)
C-N has designed camshafts plus re-worked Poppe's paper so has ways of looking at things.
I think orginal style Karlson couplers have size restaints and size-cutoff tradeoffs within those restants.
there ain't much volume to a coupler - only about 0.6 cubic feet on K12, 1 cubic foot on X15 and ~2 cubic foot on K15 and maybe 1.6-2.5 cubic foot for 18".
for simplicity of cabinet there's possiblities of strong output - Im not sure if the air on small K's goes into diestortion at very high spl (?)
not sure if K's can be made to go naturally "deep" although Exemplar uses K15 re-tuned and boosted to augment horn speakers.
Freddy
Karlson's first "Acoustic Transducers" patent from the early 1950's give his explanations so that might be a start to understand.
Karlson having speaker back iin chamber add a type of "reverb" which by K's reasoning was desirable to enhance reallism - K15 can sound pretty good.
any driver external to the cabinet will change the mix and some builders like horn on top (or open baffle as in Magnetar's "Rosie" klam with 2-170MO and tweeter)
vented originals (K15/K12 then K8) ran ~2:1 rear chamber over front chamber volume ratio.
with strong motor and light cone, Karlson seem to damp cone excursion on hard transients
I think the LF vs T-S may roughly follow a bandpass simulation. IIRC their 3rd Z peak comes in around 300/225/160Hz as size goes down from K15-K12-K8 - - if one made a rouhd or rectangular hole roughy the size of a K's aperture then would guess the result would be a high tuned bandpass enclosure. Are Karlson more than that?
a tapered slot on a pipe might effectively shorten the pipe (a guess)
C-N has designed camshafts plus re-worked Poppe's paper so has ways of looking at things.
I think orginal style Karlson couplers have size restaints and size-cutoff tradeoffs within those restants.
there ain't much volume to a coupler - only about 0.6 cubic feet on K12, 1 cubic foot on X15 and ~2 cubic foot on K15 and maybe 1.6-2.5 cubic foot for 18".
for simplicity of cabinet there's possiblities of strong output - Im not sure if the air on small K's goes into diestortion at very high spl (?)
not sure if K's can be made to go naturally "deep" although Exemplar uses K15 re-tuned and boosted to augment horn speakers.
Freddy
"distortion" - might be an inbalance heard in some small coupler where could use a midrange. a regular K12 size with 5% efficient woofer won't go low but can have good punch with 250W input peaks and hit >120dB at 1M. Acoustic Control 115BK with EV15L had similar range - we're looking at back chamber volumes of 1.3 and 1.9 CF - don't get something for nuttin' when building loud small cabinets
hi doggy -- I never had k15 anywhre near that pretty - you did a great job. do you think Karlaons are worth doing/keeping/ & building vs other types? I get "pretty good" preformance from k15 and k18 - when a big drum hits with say 200W input peak, cone doesn't move much. what kinda conical did you build for top? how far did you gap the front shelf from wings?
When I moved, those top horns went; I had so much stuff, could not take them with me.
I have the x-over and tweeter from a EV suitcase pro speaker, originally 12" bottom; this coupled to the k-15 give good imaging.
The gap at the top ended up at 5/16", it should be 1/2. I don't know if enlarging this area up top would make any audible difference? I had thought at one time the k-15 is a type of front loaded horn with the back wave getting into the mix, it would be fun to really crank them to see what they could do.Will put this back together again in the near future. The K logo were laser cut from mirror polished stainless.
I have the x-over and tweeter from a EV suitcase pro speaker, originally 12" bottom; this coupled to the k-15 give good imaging.
The gap at the top ended up at 5/16", it should be 1/2. I don't know if enlarging this area up top would make any audible difference? I had thought at one time the k-15 is a type of front loaded horn with the back wave getting into the mix, it would be fun to really crank them to see what they could do.Will put this back together again in the near future. The K logo were laser cut from mirror polished stainless.
hey doggy - might be fun to try a 10k about like that testbox pic - say 14x13x27 - 14" would be nice width to pile in with other stuff.
whachu think about a 10K or new 12K and how one might be done? seems to me it wouldn't hurt to have very rough test box with hinged baffle and a roll of duct tape to set baffle angle and upper board by ear (?)
whachu think about a 10K or new 12K and how one might be done? seems to me it wouldn't hurt to have very rough test box with hinged baffle and a roll of duct tape to set baffle angle and upper board by ear (?)
thanks - getting back to Karlson - k15 with c15cx is pretty good on a number of things including pedal harpsichord (better than my ob stuff) K's are great for plucked strings.
for modern driver, 15cxha should be similar (?) but have seen comments to HF driver not having a lot of sensivity.
k15 is already designed and ready to roll. watch out for front shelf getting too close to wings or port area being choked too low - also, damping beyond JEK's 3 pads is probably too much and will kill it.
Moray - do you thnk a taller 10K could sound good? - 27x14x13 - 25-30 degrees, ~1.2CF loaded Vbr/~0.6CF Vbf - tuning (Z-minimum) ~55 or so (?) - getting tricky. X15 seemed more problematic than K15 plus x15 using ~5-8% woofer loses almost 1/2 octave due to ~43% overall bulk downsizing, leaving more a "midbass" unit. C-N ran 1844 and liked it for awhile - I had trouble with this in x15 copy - partially due to high Le (4mH for an 8 ohm driver) - maybe mass to some extent. Cone composition on 1844 is good.
for modern driver, 15cxha should be similar (?) but have seen comments to HF driver not having a lot of sensivity.
k15 is already designed and ready to roll. watch out for front shelf getting too close to wings or port area being choked too low - also, damping beyond JEK's 3 pads is probably too much and will kill it.
Moray - do you thnk a taller 10K could sound good? - 27x14x13 - 25-30 degrees, ~1.2CF loaded Vbr/~0.6CF Vbf - tuning (Z-minimum) ~55 or so (?) - getting tricky. X15 seemed more problematic than K15 plus x15 using ~5-8% woofer loses almost 1/2 octave due to ~43% overall bulk downsizing, leaving more a "midbass" unit. C-N ran 1844 and liked it for awhile - I had trouble with this in x15 copy - partially due to high Le (4mH for an 8 ohm driver) - maybe mass to some extent. Cone composition on 1844 is good.
Yes but.....
you would have to do a bunch of cur and try to make it go, Since double (tripple actually) chamber cabs are not my strenght I would choose the K-Line approach. Did you look at the klayman patent US # 5,177,329? The dual path version is a very good idea. Building on that I would make the cabinet as narrow as reasonable for a ten and then figure out two vents. One at 1/4 wave length of driver Fs and the other at a 1/4 wave length of the first harmonic above Fs. I would include the length of the front coupler section in the vent lengths. I think that neasuring the vent to the centre of the driver would be fine. That's what I would do.
I don't know what Tom Danley will do with the Klayman patent I think his goose is cooked with that one as far as getting his own patent on the TAP. Best regards to you Freddy as ever Moray James.
you would have to do a bunch of cur and try to make it go, Since double (tripple actually) chamber cabs are not my strenght I would choose the K-Line approach. Did you look at the klayman patent US # 5,177,329? The dual path version is a very good idea. Building on that I would make the cabinet as narrow as reasonable for a ten and then figure out two vents. One at 1/4 wave length of driver Fs and the other at a 1/4 wave length of the first harmonic above Fs. I would include the length of the front coupler section in the vent lengths. I think that neasuring the vent to the centre of the driver would be fine. That's what I would do.
I don't know what Tom Danley will do with the Klayman patent I think his goose is cooked with that one as far as getting his own patent on the TAP. Best regards to you Freddy as ever Moray James.
oooooooooo Moray - missed that patent - offshoot of friend the transflex & possible cooker - -oooo again- skimmed it - very good and Fig. 2 puts on more heat - but might help things...
since klayman sounds like a good game, and coupler bulk and height need to be practical even as "audio toy", what roughly would you suggest for lengths and layout to use Beta 10cx? (not great but already own)
the pipe's effective length will be shortened by aperture.
one- fold seems good and coming in around 4ft tall. how much pipe area? how to vent it into fig2 style? - (if needed)
KenL did Fig 1 Karlson style many years back with 15" Lanzar and 65" high expo slot - siad it played deep.
10cx
Resonant Frequency (fs): 38Hz
Impedance (Re): 5.64 ohms
Coil Inductance (Le): 0.99mH
Electromagnetic Q (Qes): 0.29
Mechanical Q (Qms): 10.34
Total Q (Qts): 0.29
Compliance Equivalent Volume (Vas):
131 liters
4.63 cu. ft.
I don't look at D(t)BR on K and not sure if notch comes in like DBR sims (imo theres some coupled cavity things which can be seen from Z curve - look at 3rd peak) .
also am complete dummy with t-line - heard a few good/or interesting ones when young. For multipath line had Conctrabomarde but it didnt' have sufficient power to play 18x28x8 room. I could beat it with a bandpass box.
Best,
Freddy
since klayman sounds like a good game, and coupler bulk and height need to be practical even as "audio toy", what roughly would you suggest for lengths and layout to use Beta 10cx? (not great but already own)
the pipe's effective length will be shortened by aperture.
one- fold seems good and coming in around 4ft tall. how much pipe area? how to vent it into fig2 style? - (if needed)
KenL did Fig 1 Karlson style many years back with 15" Lanzar and 65" high expo slot - siad it played deep.
10cx
Resonant Frequency (fs): 38Hz
Impedance (Re): 5.64 ohms
Coil Inductance (Le): 0.99mH
Electromagnetic Q (Qes): 0.29
Mechanical Q (Qms): 10.34
Total Q (Qts): 0.29
Compliance Equivalent Volume (Vas):
131 liters
4.63 cu. ft.
I don't look at D(t)BR on K and not sure if notch comes in like DBR sims (imo theres some coupled cavity things which can be seen from Z curve - look at 3rd peak) .
also am complete dummy with t-line - heard a few good/or interesting ones when young. For multipath line had Conctrabomarde but it didnt' have sufficient power to play 18x28x8 room. I could beat it with a bandpass box.
Best,
Freddy
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