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Carlson enclosure build (Read 276 times)
Tooppy
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Carlson enclosure build
04/17/20 at 19:57:55
 
Archie,

I have posted pictures of some Big OB and Medium size I made quickly to test .
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Archie
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Re: Steve's BIG BETSY Project
Reply #1 - 04/18/20 at 00:35:24
 
Sorry, I'm not seeing them.
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Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods)
CSP3 (25th A mods)
ZMA (25th A mods)
ZLC
Homemade Big Betsy Speakers
Silver Cabling
DIY Isolation platforms under amps & TT.
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JBzen
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Re: Steve's BIG BETSY Project
Reply #2 - 04/18/20 at 07:28:14
 
Archie,

Page 25 and 26 of this thread contain Tooppy's pictures of the green board test baffles.

John
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AMC CD8b>XO3>Beldon coax>Sheldon Stokes tube DAC>twisted copper>Cambridge CXNV2>ZSTAGE>ZKIT1>Carol silver>Jordan JX92S/VTL box>AKSA 100W SS Amp>Wicked One with DMH108. Ortofon 2M Bronze>ZP3>JVC QL-F4>Sims isolation. DIY Isolation>AC filtering>JR SU-2 balance power
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Tooppy
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Posts: 36
Re: Steve's BIG BETSY Project
Reply #3 - 04/18/20 at 10:43:23
 
@Acousticzen

Here are some pictures. Consider it is far from being finished, I leave the top and back unsealed to make eventual modification.
Also, this type of material is the worse to work with and the planks you buy are not flat because of bad storage which raise a lot of sealing problems.
But it is cheap, avalaible, in fact it is virtually the only thing avalaible here and for that 2.2cm thickness I waited 2 months, and the main thing, the most important it is heterogeneous which is very important to avoiding internal standing waves.
I hate damping which muffle the sound, here there is none.
Living in a flat, all is made on my kitchen table on my best.
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1ers-lments.jpg
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Tooppy
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Re: Steve's BIG BETSY Project
Reply #4 - 04/18/20 at 10:45:21
 
Well, only one picture appeared

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Vue-de-face-01.jpg
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Tooppy
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Posts: 36
Re: Steve's BIG BETSY Project
Reply #5 - 04/18/20 at 10:46:57
 
It seems I have to do one picture at a time
Here is the inside from the top
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Interieur-02.jpg
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Archie
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Re: Steve's BIG BETSY Project
Reply #6 - 04/18/20 at 17:40:36
 
Thanks for the picture link.  I remember seeing them now.  I'm not surprised that the foam boards didn't do much for the sound.  These new enclosures look interesting.  Hopefully, they'll do it for you.  The F15 driver is really special.
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Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods)
CSP3 (25th A mods)
ZMA (25th A mods)
ZLC
Homemade Big Betsy Speakers
Silver Cabling
DIY Isolation platforms under amps & TT.
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TomR
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Posts: 22
Re: Steve's BIG BETSY Project
Reply #7 - 04/28/20 at 18:39:29
 
Tooppy,
I am interested in your listening impressions of the Karlson enclosures compared to the open baffle.

Did you calculate a specific Karlson enclosure for the F15, or did you use a existing design ?


Please advise,
Tom in Lafayette
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Tooppy
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Re: Steve's BIG BETSY Project
Reply #8 - 04/29/20 at 14:18:15
 
Tom,

I just upscaled for a 15' and don't believe very precise measurements are critical, they are not.
I tried different kind of bracing/internal partition, it make virtually no differences.
I even tried adding a tweeter, compression and cone, with a crossover 18db at 1800Hz, the thing works better alone.
As such it might be good to try a phase correction of some kind to see, it's all depend of your room.
Earlier I mentioned I listen at very low level, with an OB I lose a lot.
With this K I have back all the music, it fill up the room and it gives the feeling I play to loud but it is not the case, I hardly hear anything if I go to the next room.
Big box reproduces large sound and I love it. The Japaneses play big JBL in very small listening rooms, they are right.
OB's placement need big rooms as they must be at least 4 feet away from any wall, that is to say in a dedicated room. I am happy I tried to realize it.
Let me repeat that the material used is very important, if you use plain wood you may need damping and then you enter probably into very unpleasant experiences of trials/errors which might never be conclusive so deceptive on what a K could be.
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Tooppy
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Posts: 36
Re: Steve's BIG BETSY Project
Reply #9 - 04/30/20 at 18:50:06
 
Tom,

Actually I didn't answer correctly, I scaled up to get the approximate speaker volume the Lii F15 needs and the vent surface. All this based on the Lii's drawing.
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TomR
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Re: Steve's BIG BETSY Project
Reply #10 - 05/01/20 at 15:38:19
 
Thank you for the clarification, from your last response I was still a unsure exactly how you determined size/volume.

Looking at your photos and comparing them to existing Karlson enclosure plans, your build looks more like a quarter wave horn? Other cabinet plans show a rectangular vent or slots for the driver back wave to exit, although Karlson enclosures seem to vary a bit ?


Tom in Lafayette
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Tooppy
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Re: Steve's BIG BETSY Project
Reply #11 - 05/01/20 at 17:31:00
 
Tom,

You have different type of Karlson enclosures, you are referring to the K15 or K12 which is effectively rather different. Actually it would have been easier for me to do K15 as I made before a XK4, but I wanted to try the Karlsonator which you could call a resonator.
While I didn't built the K15 for this Lii F15, I am pretty sure it would work perfectly.
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TomR
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Re: Steve's BIG BETSY Project
Reply #12 - 05/04/20 at 02:22:59
 
Thanks for the clarification - I have similar listing issues, where Karlsonator may be a better implementation choice. I will continue to research.....


Thanks,
Tom in Lafayette
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Tooppy
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Re: Carlson enclosure build
Reply #13 - 05/20/20 at 10:08:27
 
Thanks Steve to have moved this to a new topic. My built is nearly finished, I will post extra pictures as soon as possible.

To me the subject was "what kind of speaker can we make using these Lii F15 as they should", meaning as full range.
You did it very elegantly with an OB and readers of this forum should look at it very carefully because it could well be THE solution for many, at least to the ones who listen to music and not to a system.
They are simple, very well built and beautiful, nothing on the signal path from a very low power amp like the ones you propose, there is a lot to like.

But in my room I cannot leave four feet behind the speakers, I need to be nearer the walls, so I tried a different approach I had for a long time in my mind and it works.....but it is a hell of a job to craft at least with my means.  :P Tongue
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gnarlydad
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Re: Carlson enclosure build
Reply #14 - 05/21/20 at 04:44:36
 
Toopy, from my somewhat limited experience as a DIY speaker builder, and some rather ancient history as a custom cabinet maker, I think you're doing a brilliant job. You're designing solutions that work in your space. Not an easy thing to do. Good job.
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Tooppy
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Posts: 36
Re: Carlson enclosure build
Reply #15 - 05/25/20 at 23:02:39
 
Hi

here is the (virtually) finished speaker

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Fini-de-face-Nok20200524.jpg
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