roughly that much attenuation - I've tried a few passive xovers some years ago but can't remember what half-way worked - its the hornless small magnet (its listed as "100oz" but I would say 60oz at most 12CXA http://www.paudio.ro/pdf/products/BM-12CXA-12CXHA.pdf
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Hi all Karlsson fans,
I just bought me some University 312 diffaxial series 200 speakers.
I'm looking at building a mono speaker for the garden/garage with its own tube amp.
K15 or K12 or any other version that would be nice for this vintage coaxial? Scaled down K15 perhaps?
Parallel SE el84 amp or PP? Any experience with the 312?
All the best
Gustav
I just bought me some University 312 diffaxial series 200 speakers.
I'm looking at building a mono speaker for the garden/garage with its own tube amp.
K15 or K12 or any other version that would be nice for this vintage coaxial? Scaled down K15 perhaps?
Parallel SE el84 amp or PP? Any experience with the 312?
All the best
Gustav
although the motor is weak (high qts), I think it would play "pleasantly" in a K12 - here's a story of a now rare K12 which came un-ported - the owner instead of cutting/drilling into the vintage cabinet, made a rear aperiodic vent.
High Efficiency Speaker Asylum
I probably have a 6201 University - can't remember if its in a R-J or not but could measure its qts and fs.
GregB's Karlsonator 12 might be workable - as drawn, it has tuning pretty close to 40Hz. K12 tune in the low 60's - which is ok .
scaled K15 would probably be ok too. Karlson deleted the front shelf in all of his smaller cabinets.
High Efficiency Speaker Asylum
I probably have a 6201 University - can't remember if its in a R-J or not but could measure its qts and fs.
GregB's Karlsonator 12 might be workable - as drawn, it has tuning pretty close to 40Hz. K12 tune in the low 60's - which is ok .
scaled K15 would probably be ok too. Karlson deleted the front shelf in all of his smaller cabinets.
Thanks Freddi!
I have not seen any useful data on the 312 s200 but I think I found someone who had measured three 6201's with qts around 0.6 and fs around 60.. My guess is that qts can vary wildly with 40-50 years old alnico magnets..
Would not a medium to high qts like a bigger box? I'm thinking full size K15? Or would that be a step to far?
I probably would prefer more kick then extension! Since I will use one single speaker outdoor!
I have not seen any useful data on the 312 s200 but I think I found someone who had measured three 6201's with qts around 0.6 and fs around 60.. My guess is that qts can vary wildly with 40-50 years old alnico magnets..
Would not a medium to high qts like a bigger box? I'm thinking full size K15? Or would that be a step to far?
I probably would prefer more kick then extension! Since I will use one single speaker outdoor!
K15 would be something to try and would maximize things - - make it to plan, then "front mount" the 312 to an adapter panel/ring so a 15" might be accommodated in the future if wished. For non-traditional, GregB's Karlsonator might be a consideration. As drawn its tuned just about right on 40Hz.
University's 6201 was in the recommended driver list on K15's plan published in the January 1954 issue of Radio and TV News:
http://classicaudio.ru/forum/uploads/monthly_08_2011/post-329-1385471361,079.png
University's 6201 was in the recommended driver list on K15's plan published in the January 1954 issue of Radio and TV News:
http://classicaudio.ru/forum/uploads/monthly_08_2011/post-329-1385471361,079.png
hey xrk971 - are practical hybrid of tapped horn (expanding path) and K possible? - if so, what might be done?
(I'll have to look) - MMJ's Karlflex sans smoothing resonator would look something like this rough hornresp representation of tb46's 74 liter cabinet for 15tbx100/40 - - a slightly larger XKi might be a good alternative for 15tbx/15pzb type
DJK envisioned something like this - dunno if of any value
DJK envisioned something like this - dunno if of any value
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The 15TBX does well as a FLH or a 6th order band pass push pull slot loaded sub. I have modeled the 18TBX for both and it really can get loud with extreme cone control where thermal limit is reached before Xmax.
I have a few of the TC-9's and would like to try the Karlsonators. I have enough drivers that I can do the single driver and dual driver versions. I have found some of the drawings used to build them, but the drawings seem to be missing a few things. Can someone post a link to good plans for both versions?
Thanks,
Mike
Thanks,
Mike
The plans are all linked in post 1 of the 0.53x Karlsonator thread. 0.53x CAD drawings by TB46 and 0.40x by Blaides.
- wonder what would make a nice little K for w8-1772? - I'll have to make an adapter to mount it in the 0.62 scale K15. It played subjectively well in the "SK8" and I've stuffed it into a little K8 size cabinet where it would probably work with a subwoofer/helper woofer
the trick is to get a pretty smooth coupler when small. I wonder how much influence the front chamber's shape has on response within practical limits of the volume needed vs baffle tilt and aspect?
the green line is the Tangband w8-1772 and the coupler's rear volume is around 1/2 cubic foot. I taped over 3 of the slits and created a horizontal slot vent at the top using a "multitool" - the other trace is the mini foam-core Karlsonator with Vifa TC9D. A passive notch filter centered @300 could make the 1772/K8 decent.
the trick is to get a pretty smooth coupler when small. I wonder how much influence the front chamber's shape has on response within practical limits of the volume needed vs baffle tilt and aspect?
the green line is the Tangband w8-1772 and the coupler's rear volume is around 1/2 cubic foot. I taped over 3 of the slits and created a horizontal slot vent at the top using a "multitool" - the other trace is the mini foam-core Karlsonator with Vifa TC9D. A passive notch filter centered @300 could make the 1772/K8 decent.
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hey X- - got a K alignment for a Gradient Acoustics AX08? - will it need a sealed back K/Xki? - would it play in GregB's Karlsonator8 without LF peaking? - it may not have much xmax
Def_Driver 'Gradient Acoustics AX08' (low BL, 8inch fullrange with extended top end - 1" coil)
Sd=211cm2
fs=37,6Hz
Mms=11.6g
Qms=5.69
Qes=0.54
Re=6.3
BL=5.67
Le=0.05mH
Vas=91.7L
$61 will get one shipped using a %10 off coupon
Def_Driver 'Gradient Acoustics AX08' (low BL, 8inch fullrange with extended top end - 1" coil)
Sd=211cm2
fs=37,6Hz
Mms=11.6g
Qms=5.69
Qes=0.54
Re=6.3
BL=5.67
Le=0.05mH
Vas=91.7L
$61 will get one shipped using a %10 off coupon
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hey X -- what do you think about the idea of converting a slit vent K12 to a single vent? - I would cover/fill the lower slits then cut out the top slat between the top two slits. There could be two horizontal spaced slots but their area might be excessive. Its somewhat difficult to tell tuning as the front aperture is also plays a role in setting system tuning.
here's a cute K12 with Magnavox over in Russia - not sure if the aperture is radial arc or not - starting gap is pretty wide - that's one adjustment available in voicing a Karlson.
I don't like hacking up old cabinets but think a top horizontal vent might work OK and perform
with less compression than the narrow slits
IF fed pure sine-wave in the vicinity of fb, these narrow slit vents exhibit very high air velocities, and harmonic distortion. Since
a lot of music is comprised of transients, the subjective result is listenable and even a bass guitar can be played into
such a cabinet with no noticeable distortion. A single vent of 10 or so square inches in a K12 will pass sine with little harmonics.
Vent position and aspect matters somewhat with regards to measured response. Karlson used distributed slit and distributed hole
array vents in his K12. The "X15" 2-way system has been seen with one large rectangular horizontal vent (probably for organ) and with a central vent flanked by "de-Q-ing" holes. The addition of ~3/4" holes makes the coupler sound less "heavy" or "faster" so this is another way to voice a traditional K.
Russian K12
here's the so-called "Pioneer K12" with 7 slits which has appeared quite often
I would remove the wood between the top 2-slits and cover or fill the lower slits.
A standard K12 from the July 1958 Popular Mechanix plan had 6 slits. My factory K12 from the 1960's have 4 "taller" slits"
I don't like hacking up old cabinets but think a top horizontal vent might work OK and perform
with less compression than the narrow slits
IF fed pure sine-wave in the vicinity of fb, these narrow slit vents exhibit very high air velocities, and harmonic distortion. Since
a lot of music is comprised of transients, the subjective result is listenable and even a bass guitar can be played into
such a cabinet with no noticeable distortion. A single vent of 10 or so square inches in a K12 will pass sine with little harmonics.
Vent position and aspect matters somewhat with regards to measured response. Karlson used distributed slit and distributed hole
array vents in his K12. The "X15" 2-way system has been seen with one large rectangular horizontal vent (probably for organ) and with a central vent flanked by "de-Q-ing" holes. The addition of ~3/4" holes makes the coupler sound less "heavy" or "faster" so this is another way to voice a traditional K.
Russian K12
An externally hosted image should be here but it was not working when we last tested it.
here's the so-called "Pioneer K12" with 7 slits which has appeared quite often
I would remove the wood between the top 2-slits and cover or fill the lower slits.
A standard K12 from the July 1958 Popular Mechanix plan had 6 slits. My factory K12 from the 1960's have 4 "taller" slits"
An externally hosted image should be here but it was not working when we last tested it.
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hey X and other K-builders - any thoughts on cavity shape and curved reflectors? - for a given frontal aspect, the cabinet below has a somewhat larger front cavity volume vs the way the Karlsonators are being built due to its concave reflector.
there's a pretty large cavity with my 0.62 scale K15. What in general happens if the baffle is tilted forwards - say 20 degrees back vs 30 degrees, lessening cavity depth? - does that mainly move the cavity peak region a bit higher? - how about the aperture flare when that is done? Karlson's "x15" had a flare somewhat faster than what would be described by a radial arc swing.
this is the way Carl makes some of his small K's. He says a fully curved reflector also brought improvement to his interpretation of the X15 vs flat panel approximation. My original and copy X15 have two deep holes (measured at ground) don't know if bounce or whether from inadequate port area and backwave "fill" (?)
there's a pretty large cavity with my 0.62 scale K15. What in general happens if the baffle is tilted forwards - say 20 degrees back vs 30 degrees, lessening cavity depth? - does that mainly move the cavity peak region a bit higher? - how about the aperture flare when that is done? Karlson's "x15" had a flare somewhat faster than what would be described by a radial arc swing.
this is the way Carl makes some of his small K's. He says a fully curved reflector also brought improvement to his interpretation of the X15 vs flat panel approximation. My original and copy X15 have two deep holes (measured at ground) don't know if bounce or whether from inadequate port area and backwave "fill" (?)
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Freddi,
The curved surface may affect the reverberation of the higher frequencies and make things cleaner. Bass extension is strictly a function of the relative volumes and how they play together to form a 6th or 8th order band pass.
The curved surface may affect the reverberation of the higher frequencies and make things cleaner. Bass extension is strictly a function of the relative volumes and how they play together to form a 6th or 8th order band pass.
assuming correct, where and how does one pick the best curve for the upper reflector in a given K-coupler?
hello xrk971, in your estimation, do you think an XKi for one Pyle pym1298/Kappa12a, exhibit good large signal subjective dynamics? - 50 liters rear chamber is a little larger than Karlson's K12. Overall size would be fine since the front chamber is only 12.5 liters. It would be topped with a K-tube.
I rather have a K10" but don't have a great 10" midbass to load. pym1298 are just sitting and they're decent woofers.
I rather have a K10" but don't have a great 10" midbass to load. pym1298 are just sitting and they're decent woofers.