On Karlson K-15 style boxes, which are not TL's, but 8th order bandpass reflex boxes, there seems to be shelves added here and there, based on listening preferences. I could never see much of an effect from an Akabak model standpoint. I don't like adding reflectors in front of a driver - it just adds colouration due to reflection nulls. There is definitely a lot of foam damping pad work that is needed when using wooden boxes. We have seen this time and time again. The hard reflectivity of the wood makes a very boxy sound without the melamine foam pads.
Makes sense. Will not waste time on shelf then.
Now after seeing first hand how a foam enclosure works I am very curious and interested in making more and experimenting. I am always interesting in doing whats different. Foam board enclosures are a great thing for this type of person. Easy for anyone to do. No power tools needed. Bravo to you for being the one it seems to really introduce it to many others.
Ever thought about a thread for pictures of finished foam board speakers? Id like to see how people finish them. Paint, veneer etc. ? Only downside for me at moment is how do i make it look great. Anyone try v
vinyl wrapping?
For a small room/office what would you say is your favorite 2 designs for tc9?
in K15, the front shelf somewhat fixed a notch in response. Karlson never used that feature in his smaller cabinets. -- guessing it was brought back for Karlson's K18. For K15 size K-coupler, I think making the front chamber less deep will avoid that notch.
The rear shelf has been interpreted as a lowpass filter, or choke which can sometimes be tweaked to improve subjective transient response. KK Audio put a rear shelf in their version of the Transylvania Power Co. Karlson type and in that case, it negatively impacted frequency response - not terribly - but probably a useless feature for that particular cabinet.
The rear shelf has been interpreted as a lowpass filter, or choke which can sometimes be tweaked to improve subjective transient response. KK Audio put a rear shelf in their version of the Transylvania Power Co. Karlson type and in that case, it negatively impacted frequency response - not terribly - but probably a useless feature for that particular cabinet.
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Kuestion for XRK971 - If I went with the scaled K12 below - do you think that's squeezing size too much for 6.5" vs 0.43 scaled K15?
Driver cutout 145mm for 6.5"
SCALED K-COUPLER FOR 6.5 INCH SPEAKER. USING 12MM PLYWOOD
0.43 SCALE K15 - about a 7.6 sq.in port would be scale (with the front shelf)
WIDTH = 0.43X 21 = 9 INCHES INTERNAL ~ 10 INCHES EXTERNAL
DEPTH = 0.43x 16.5 = 7 INCHES INTERNAL = 8 INCHES EXTERNAL
HEIGHT = 0.43X 31.5 = 13.5 INCHES INTERNAL = 14.5 INCHES EXTERNAL
INTERNAL VOLUME SANS BAFFLE/PORT AND DRIVER ~ 850 CUBIC INCHES
SO ROUGHLY 765 CUBIC INCHES SANS DRIVER. 765/3 = 255
SO REAR CHAMBER ~ 510 CUBIC INCHES/ FRONT CHAMBER 255
6.5/12x SCALE k12 ~0.54 SCALE - I'm guessing about a 5--6 sq.in. port
WIDTH = 0.54x 15.25 = 8.25" INTERNAL = 9 INCHES EXTERNAL
DEPTH = 0.54x 12.25 = 6.615" INTERNAL = 7.6" EXTERNAL
HEIGHT = 0.54x 24 = 13" INTERNAL = 14 INCHES EXTERNAL
INTERNAL VOLUME SANS BAFFLE/PORT BOARDS AND DRIVER ~707 CUBIC INCHES
SO ROUGHLY 637 CUBIC INCHES SANS DRIVER. 637/3 ~212 CUBIC INCHES
SO REAR CHAMBER ~424 CUBIC INCHES/ FRONT CHAMBER 212 CUBIC INCHES
Driver cutout 145mm for 6.5"
SCALED K-COUPLER FOR 6.5 INCH SPEAKER. USING 12MM PLYWOOD
0.43 SCALE K15 - about a 7.6 sq.in port would be scale (with the front shelf)
WIDTH = 0.43X 21 = 9 INCHES INTERNAL ~ 10 INCHES EXTERNAL
DEPTH = 0.43x 16.5 = 7 INCHES INTERNAL = 8 INCHES EXTERNAL
HEIGHT = 0.43X 31.5 = 13.5 INCHES INTERNAL = 14.5 INCHES EXTERNAL
INTERNAL VOLUME SANS BAFFLE/PORT AND DRIVER ~ 850 CUBIC INCHES
SO ROUGHLY 765 CUBIC INCHES SANS DRIVER. 765/3 = 255
SO REAR CHAMBER ~ 510 CUBIC INCHES/ FRONT CHAMBER 255
6.5/12x SCALE k12 ~0.54 SCALE - I'm guessing about a 5--6 sq.in. port
WIDTH = 0.54x 15.25 = 8.25" INTERNAL = 9 INCHES EXTERNAL
DEPTH = 0.54x 12.25 = 6.615" INTERNAL = 7.6" EXTERNAL
HEIGHT = 0.54x 24 = 13" INTERNAL = 14 INCHES EXTERNAL
INTERNAL VOLUME SANS BAFFLE/PORT BOARDS AND DRIVER ~707 CUBIC INCHES
SO ROUGHLY 637 CUBIC INCHES SANS DRIVER. 637/3 ~212 CUBIC INCHES
SO REAR CHAMBER ~424 CUBIC INCHES/ FRONT CHAMBER 212 CUBIC INCHES
Some cool work by elleman with an all 3d printed mini 0.25x Karlsonator for 3FE25 over in this thread:
Desktop TL / BLH with 3Fe25
Although only 0.25x scale, seems to reach 85Hz! Some EQ applied to flatten a 600Hz panel resonance peak.
Desktop TL / BLH with 3Fe25
Although only 0.25x scale, seems to reach 85Hz! Some EQ applied to flatten a 600Hz panel resonance peak.
Long ago I made these drawings, never built it, but could it help ?
It is an XK not a K and all in millimeters.
No, I have no tools to do that, these dimensions should be ear verified, particularly the vent, the rest could be approximated.
But may be you can do it, that should be great really.
I've been looking for the last hour or so, but couldn't find it- forgive me if I'm being blind. Does anyone happen to have a PDF set of plans for the dual TC9FD .53x version in 1/2" plywood with imperial/inch measurements? I found a few in foamcore but nothing for the TC9FD for a wood build.
I have some extra wood and will soon be trying to get access to a table saw for various projects, so wanted to try to get some pieces cut if possible.
I have some extra wood and will soon be trying to get access to a table saw for various projects, so wanted to try to get some pieces cut if possible.
I don’t know about inches, but divide all mm dims by 25.4 and you have inches.
Skylar’s:
TB46’s is in inches:
https://www.diyaudio.com/forums/att...l-tc9fds-karlsonator_-53x_dual_vifa_tc9fd-pdf
Jhofland’s is a 3D Sketchup model, you can generate your own drawings:
https://www.diyaudio.com/forums/att...rlsonator-0-53x-dual-tc9fds-karlsonator53-zip
Skylar’s:
TB46’s is in inches:
https://www.diyaudio.com/forums/att...l-tc9fds-karlsonator_-53x_dual_vifa_tc9fd-pdf
Jhofland’s is a 3D Sketchup model, you can generate your own drawings:
https://www.diyaudio.com/forums/att...rlsonator-0-53x-dual-tc9fds-karlsonator53-zip
I took out my old 0.40x Karlsonator today, these were the original ones that started it all. They have 3FE25-4 drivers in them. Gave them a new facelift with a fresh (now second layer) sheet of high quality Elmers brand foam core (shiny faced) - made it like a new speaker again. Looks great and sounds even better with double layer K-aperture.
Listen here:
XRK Audio on Instagram: “Revival of the original 0.40x Karlsonator with 3FE25-4ohm driver. Sounds pretty good full range, no EQ or BSC. #audio #speakers…”
This speaker is heading off to Texas tomorrow.
Listen here:
XRK Audio on Instagram: “Revival of the original 0.40x Karlsonator with 3FE25-4ohm driver. Sounds pretty good full range, no EQ or BSC. #audio #speakers…”
This speaker is heading off to Texas tomorrow.
Attachments
Nice. I'm considering pulling the parallel pair of 3FE25-16's each out of my .53x builds, swapping them for a pair of TC9FD in parallel for 4 ohms to work with my new 12AV5GA project, and throwing the 3FE25-16's into my .40x for a 16 ohm load to run with my flea amp, since the lower output isn't an issue for nearfield listening at the workbench while working on projects, and the lighter load should give lower distortion.