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Got FE206En, seeking advise.
Got FE206En, seeking advise.
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Old 9th November 2019, 09:24 AM   #11
srian is offline srian  Sri Lanka
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Default Original Karlsonator

The file I missed to attach
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Old 9th November 2019, 04:43 PM   #12
freddi is offline freddi  United States
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Got FE206En, seeking advise.
Regarding using the Karlsonator8, its tuned to around 41Hz - which may work ok but probalby tuned too low for punch.

In XRK971's post below he speaks of scaling Karlsonator8 for a very low Q Fostex 8. Its confusing as he says 0.53X width as that's not wide enough to mount a 6 inch speaker muchless an 8. Perhaps he will clarify that statement. (maybe "width" = front to back depth ?)

Mini Karlsonator (0.53X) with Dual TC9FD's

FE206EN plays well enough with a K12. K12 are tuned around 62Hz. I'd imagine 70Hz would be where it starts rolling off.

Response of a scaled down (0.62X) K15 with FE206EN. K12 will be a bit lower but not much.
(that graph may have been taken with the cabinet elvated 30 inches off the floot)
https://i.imgur.com/i266Azn.gif

Karlsonator8 plan by GregB
https://i.imgur.com/Crig5iH.png

1960's Karlson K8 plan with two panel reflector. K8 were tuned around 95Hz
and probably good to a 100Hz crossover to woofer/subwoofer.
https://i.imgur.com/0BL0Ihb.png

One K8 plan - not sure how close to Karlson's 1955 K8 (I'll have to
look for those dims) A top gap/shelf port may work well with this size.
https://i.imgur.com/deKwknH.jpg

XRK971 suggested a reasonably small (24 liter) XKi alignment for FE206EN
-that could be fun to try

XKi - X's ab initio Karlson 6th Order Bandpass

Here's a nearly K10 cabinet tried with FE206EN which was called "SK8". It had a curved reflector.
I think it might have measured better with a simple canted port panel. It sounded good with FE206EN,
AN8 and W8-1772. Three sets of wings were tried and FE206EN worked well with all. The fast opening
could aid with a driver whose mid/treble response is a bit lacking or laid back.

https://i.imgur.com/dHdfPBm.jpg

Last edited by freddi; 9th November 2019 at 05:10 PM.
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Old 9th November 2019, 05:33 PM   #13
freddi is offline freddi  United States
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Got FE206En, seeking advise.
FWIW - the original rough Karlsonator8 prototype ran a FE206EN. I never got to hear it as both were ruined in the builder's basement flood.

With a good K-coupler to driver tonal match, there should be no front chamber damping material needed. Its somewhat a try and see/hear situation. Some little coupler could come out pretty bad without damping - or using foamcore build and very bad
if small with high Q peak/hole.

Moray Jame K-T-line couplers with curved reflector. I still have a plan of his for (believe) FE207 and could post - with his permission.
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Old 9th November 2019, 06:47 PM   #14
freddi is offline freddi  United States
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Got FE206En, seeking advise.
Using MMJ's fudge hornresp model for the Acoustic Control 115BK, I think I can get ballpark low end predictoins for that cabinet which would correspond to my K10 based on K15 when loaded with FE206EN. The model probably is more optimistic on the low end than real.

Click the image to open in full size.
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Old 9th November 2019, 07:56 PM   #15
srian is offline srian  Sri Lanka
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24th September 2013, 03:01 AM #147 diyaudio, Karlsonator thread

tb46


Hi xrk971,

In Post #146 are you showing internal dimensions? I'll attach what I have for the original Karlsonator, please, let me know if there are any errors in this drawing.

Regards,

Attached FilesKarlsonator_Original.pdf (27.9 KB, 125 views)

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Old 9th November 2019, 08:08 PM   #16
srian is offline srian  Sri Lanka
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https://www.diyaudio.com/forums/atta...r_original-pdf

Finally, I think that I have managed to attach the link of the 8" original.
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Old 10th November 2019, 01:49 AM   #17
GM is offline GM  United States
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Hmm, I thought this was Greg B's original, which is somewhat smaller: Imgur: The magic of the Internet

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Old 10th November 2019, 06:39 AM   #18
freddi is offline freddi  United States
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Got FE206En, seeking advise.
X's statment of 0.53 width is confusing. Since a Karlsonator8 has a 12" wide baffle, the scaled baffle would be 6.36" in width - hardly enough to accomodate an 8" diameter frame driver.

Even when based to the Karlsonator(12) whose baffle width (that was based on Karlson's K12) 0f 15.25", 15.25"*0.53 = we get ~8 inches - kinda tight - but doable.

The red drawiing looks like something done by TB46 - sure miss him (assumed passed away several years back)
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Old 10th November 2019, 09:02 AM   #19
srian is offline srian  Sri Lanka
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https://www.diyaudio.com/forums/atta...r_original-pdf

Freddi
You are refering to Karlsonator 6 which is X 0.53
See forum Karlsonator #157

I read somewhere that the Karlsonator 8 is a X 0.62


See forum Karlsonator #203 for a clearer image of the 8 and read your comments.

'History repeats' in this case after 5 years.
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Old 10th November 2019, 09:13 AM   #20
srian is offline srian  Sri Lanka
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Accorging to # 203 drawing of the Katlsonator 8
11.25 / 15.25 = 0.74
So the baffle of the K8 which is 11.25 12 is a scaled down of 0.74 and
Will accomodate the FE206En which is 8.25 at the outer rim.
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