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Old 1st December 2011, 03:16 AM   #11
freddi is offline freddi  United States
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here's the basic info I got on a freshly reconed DL18 - new qes is ~0.6

factory spec EV 18B

FS - 33
Qts - .36
Qes - .376
Qms - 8.37


DL18 reconed with modern kit

FS - 36.7
Qts - .4895
Qes - .599
Qms - 3.963
Le - 1.793mH
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Old 23rd December 2011, 08:18 PM   #12
freddi is offline freddi  United States
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its difficult to get more than 1mm peak to peak at loud levels in my room with EV18B and it reaches a K-tube so transients sound "fast"
Click the image to open in full size.
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Old 24th December 2011, 01:55 AM   #13
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Quote:
Originally Posted by freddi View Post
I've got an empty 18" coupler which to try an EV - Art - do you know if MacKenzie's recone assemblies including the voicecoil are accurate reproductions?
Click the image to open in full size.
Hi Freddi: Would you post the dimensions and "K" curve for the 18-inch Karlson you pictured? I'd like to construct one for my EV -18 reconned driver. I've not WT-3ed them yet. ....Michael
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Old 24th December 2011, 02:17 AM   #14
freddi is offline freddi  United States
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I don't have a drawing anymore but will get some dims - I think the wings are P=1/Q=1.7 up to a point then that's extended with a de-Q-ing slit- you could go with the Gauss 5181 K18 plans which has a bit more front and rear chamber. 18's will work in the regular Karlson K15

Cetec-Gauss 5181
http://img72.imageshack.us/img72/825/gaussbracing.jpg

here's a 5181 build - the guy was happy
http://gainclone.com/karlsonforum/index.php?topic=42.0

Last edited by freddi; 24th December 2011 at 02:21 AM.
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Old 27th August 2013, 02:28 PM   #15
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I have one of these old CRAAFT 18" here, I think its a QL18, which has a MMD of 94g. IŽd sell it, if you like.
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Old 28th August 2013, 01:36 AM   #16
tb46 is offline tb46  United States
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Hi Y'all,

Somewhere freddi talked about a 42" high Karlson slot for an 18". Going of that, and the picture from Post #6 I end up w/ the rough front view dimensions in the attached .pdf. If freddi can find the overall dimensions, and some of the internals, maybe we can make a drawing of his tall 18" Karlson.

Regards,
Attached Files
File Type: pdf freddi_18in_Karlson_2013_Aug27.pdf (19.9 KB, 22 views)
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Old 28th August 2013, 04:11 AM   #17
tb46 is offline tb46  United States
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Hi again,

Found some more information, that changed the dimensions slightly. Hopefully, freddi has some more details:

Regards,
Attached Files
File Type: pdf freddi_18in_Karlson_2013_Aug27_second.pdf (43.4 KB, 21 views)
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Old 28th August 2013, 08:50 AM   #18
freddi is offline freddi  United States
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hey tb46 - I'll try to dig it out of my mess - have not felt well after bp hit 240/110

here's some pix if not any useful dims - it probably would make a good 15" coupler - the main aperture came from a 2-variable calculator with "p=1", "q=1.7" then the aperture was extended to the top, narrowing to a point. My long distance friend who built it did a curved reflector at the top. The vent could be either center or both panels butted to form two side gap vents.

A High Aspect 18/15 coupler (Page 1) / Karlson / Fullrangedriver Forum
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Old 28th August 2013, 02:50 PM   #19
tb46 is offline tb46  United States
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Hi freddi,

Thanks for the additional link, especially the interior pictures. My main interest is in learning AkAbak as it applies to the Karlson aperture (xrk971 has pointed me in the right direction, but, owing to time restraints as well as being "conceptually challenged", I'm nowehere near yet).

Don't worry about this, get that HBP taking care of.

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