I wanted to see what could be done in a little box.
Here's the size comparisons to Greg b's "Karlsonator 12" and Karlson's "L12" cabinets -
(there's almost no damping material in the box other than a few melamine sponges on one side of its floor)
KARLSONATOR 12 bulk = 5.333 CF / 151.05 liters. Fb ~37Hz
KARLSON "K12" = 3.265 CF / 92.48 liters. Fb ~63Hz
KUBE 12 = 2.18 CF / 61.77 liters. Fb ~59Hz
So KUBE 12 is 2/3 the size of a K12 amd 2/5 the size of GegB's Karlsonator 12.
As built by John Lapaire the dimensions are 15" W x 15" D x 16.5" H using 1/2" plywood for the sides/top-bottom and baffle, and 3/4"plywood for the back panel and aperture plate.
I designed it to fit in a particular space and for Eminence's Kappa 12A speaker and to see how small a "K" type might be built for a 12 inch speaker.
It has roughly 28.3 liters back chamber and 11.7 liters front chamber and I used hornresp's series bandpass model to make determinations.
Inner vent area is generous at ~27 sq.in. / 147.2. cm2 and the front aperture could be varied somewhat without much impact upon tuning.
For a little K-type with somewhat smoother response I believe adding a stub or tuned resonator would help matters.
This kritter should make a fun little bass guitar box - or bottom for electronic drumkit.
(I would use it in a -four-way K-stack - 35-80Hz = KUBE18 - 80 - 300Hz = KUBE12 - 300Hz -1500Hz = 8 inch K-midrange - 1500-15000Hz = K-tube.)
BTW, when making this type it could in some instances be useful to cut a "V" notch in the shelf vent per Nexo's patent for a smoother response.
https://patentimages.storage.googleapis.com/6f/8b/29/357e1bb79011ca/US20150222984A1.pdf
Here's the size comparisons to Greg b's "Karlsonator 12" and Karlson's "L12" cabinets -
(there's almost no damping material in the box other than a few melamine sponges on one side of its floor)
KARLSONATOR 12 bulk = 5.333 CF / 151.05 liters. Fb ~37Hz
KARLSON "K12" = 3.265 CF / 92.48 liters. Fb ~63Hz
KUBE 12 = 2.18 CF / 61.77 liters. Fb ~59Hz
So KUBE 12 is 2/3 the size of a K12 amd 2/5 the size of GegB's Karlsonator 12.
As built by John Lapaire the dimensions are 15" W x 15" D x 16.5" H using 1/2" plywood for the sides/top-bottom and baffle, and 3/4"plywood for the back panel and aperture plate.
I designed it to fit in a particular space and for Eminence's Kappa 12A speaker and to see how small a "K" type might be built for a 12 inch speaker.
It has roughly 28.3 liters back chamber and 11.7 liters front chamber and I used hornresp's series bandpass model to make determinations.
Inner vent area is generous at ~27 sq.in. / 147.2. cm2 and the front aperture could be varied somewhat without much impact upon tuning.
For a little K-type with somewhat smoother response I believe adding a stub or tuned resonator would help matters.
This kritter should make a fun little bass guitar box - or bottom for electronic drumkit.
(I would use it in a -four-way K-stack - 35-80Hz = KUBE18 - 80 - 300Hz = KUBE12 - 300Hz -1500Hz = 8 inch K-midrange - 1500-15000Hz = K-tube.)
BTW, when making this type it could in some instances be useful to cut a "V" notch in the shelf vent per Nexo's patent for a smoother response.
https://patentimages.storage.googleapis.com/6f/8b/29/357e1bb79011ca/US20150222984A1.pdf
Attachments
-
KUBE 12 drawing no handle 1.jpg -
KUBE12 MEASUREMENT vs SIM W 1270.jpg -
KUBE12 TABLE ON-AXIS 16U 11B W.jpg -
KUBE12 FLOOR MIC 5B 12U W.jpg -
KUBE12 70 OFF H W.jpg -
KUBE 12 KAPPA 12A INPUT Z W.jpg -
KUBE12 APERTURE PLATE ON.jpg -
KUBE 15 PLAN DONE.jpg -
Screenshot 2022-01-26 at 14-28-24 1499072939623734451-US20150222984A1 - US20150222984A1 pdf.png
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Not bad. The 250Hz front chamber tuning isn't that peaky. I'd tune the back a bit higher to even out the lower part of the gain bandwidth. The usual W-notches are very evident on this one. The internals are fairly close in volume to SK8. It's also similar enough to that mini-SK8 I never built, so am glad to see it work out in a bigger format. 🙂
How is it subjectively?
How is it subjectively?
dunno yet on SQ as need to figure out either a K-tube or horn on top plus xover. Also am really limited for freedom of movement with the Dayton USB mic's 10ft cord tethered to a desktop pc.
I need a lowpass favorable to Kappa12A and this K
can only tune "down" as the back and vent are glued - lucky to be as good as it landed.
It might be interesting to line both sides of the vent with melamine sponges.
There's no damping materials yet save for a few melamine sponges on half of the cabinet's bottom. Where might addtitional
sponges be most effective? (I'd like to hold off the back of the wings til "last")
.
I need a lowpass favorable to Kappa12A and this K
can only tune "down" as the back and vent are glued - lucky to be as good as it landed.
It might be interesting to line both sides of the vent with melamine sponges.
There's no damping materials yet save for a few melamine sponges on half of the cabinet's bottom. Where might addtitional
sponges be most effective? (I'd like to hold off the back of the wings til "last")
.
Attachments
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with health issues and no access to wood for even simple blocks, its going slow. I think Kube12 may play well with my Beyma 1.5" drivers and 1.5X scale K-tube kindly made for me by Pelanj - but want to introduce a midrange K-coupler and if could saw and had space I'm in a little mobile home) would make a "KUBE18" for comparisons and combinations with KUBE12.
Pelanj also as a gift made a pair of 1"x 9" K-tubes - I don't yet have even a block to mount them at an angle but will try to find a 2x4 scrap. Doing a sine sweep of that tube a few months ago with PRV's inexpensive ring radiator, I could feel in my body the tube's power.
I wish I had the brainpower and skills to run Akabak 3 to see if there's cavity and aperture combinations for 4 inch to 10 inch driver size which play smoother than others. My current midrange module is K8 with B&C 8pl21 and it exhibits two major dips even without the aperture.
The interest in a multiway Karlson approach stack comes from wanting realistic timbre and dynamics playback of guitars - piano - drums, and benefits from distortion reduction can be dramatic,
So - a 3 or 4 way Karlson stack even before the subwoofer could be much fun.
Pelanj also as a gift made a pair of 1"x 9" K-tubes - I don't yet have even a block to mount them at an angle but will try to find a 2x4 scrap. Doing a sine sweep of that tube a few months ago with PRV's inexpensive ring radiator, I could feel in my body the tube's power.
I wish I had the brainpower and skills to run Akabak 3 to see if there's cavity and aperture combinations for 4 inch to 10 inch driver size which play smoother than others. My current midrange module is K8 with B&C 8pl21 and it exhibits two major dips even without the aperture.
The interest in a multiway Karlson approach stack comes from wanting realistic timbre and dynamics playback of guitars - piano - drums, and benefits from distortion reduction can be dramatic,
So - a 3 or 4 way Karlson stack even before the subwoofer could be much fun.
with a $40 Kinter 2.1 3118 amplifier plus two "K3.5" w. 4 ohm 3fe25 drivers , Kube12 makes a fine little 2.1 system - - not deep but not muddy and plenty of volume on the low end from drums and organ pipe sounds. It should also make an interesting FAST or 3-way. Different apertures would be worth exploring including a keystone when running wider range than "helper woofer".
Hey Freddy scoot me a pm I want to discuss recent application of Karlson tapers on JBL 4626a speakers. Thanks.