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Lowther PM6C in Karlson 12

100.40.199.227

Posted on December 3, 2016 at 14:33:14
wclarson12
Audiophile

Posts: 19
Location: Hudson Valley NY
Joined: April 10, 2014
Has anyone actually done this?
I have a pair of ravaged 6c's where I finally succeeded in centering voice coils.
I have seen mention of another cabinet, a Karsonator type?... suitable for Lowther?
Thanks

 

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RE: Lowther PM6C in Karlson 12, posted on December 5, 2016 at 19:31:29
freddyi
Audiophile

Posts: 3123
Joined: December 6, 2001
a Karlsonator 8 might work but its tuned quite low at ~40Hz. which may be too low. XRK971 at diyaudio could simulate a higher tuned version with akabak for you.

from FE206EN in K12, I would guess your Lowther to sound "very good" with good punch.
Karlson Evangelist

 

RE: Lowther PM6C in Karlson 12, posted on December 5, 2016 at 20:12:38
wclarson12
Audiophile

Posts: 19
Location: Hudson Valley NY
Joined: April 10, 2014
Thanks Freddyi
Its time to try a Karlson 12 I suppose.
I know you've been curious about this.

 

RE: Lowther PM6C in Karlson 12, posted on December 6, 2016 at 01:28:38
freddyi
Audiophile

Posts: 3123
Joined: December 6, 2001
I think I would use a single vent rather than the six slit distributed vent. May depend upon your music. "If" the slit vent were presented with a true sin wave in the region of tuning, then it would produce overtones. K12 changed a bit from 1954 as the "Karlsonette" (before K8 was introduced) with a horizontal slot vent to a distributed 6-slit vent around 1956. One later model had a hole array and was apparently sold sometimes with a blank port panel. That model re-introduced a full width rear shelf. In the 1954 K12, there was a sliding 3 position bar to tweak the rear lowpass gap.

if you build a version with full width lowpass gap, then it might be useful to tweak that gap using music with clean transients on things like drums, and plucked/slapped upright bass viola

below are approximate dimensions - material thickness was 3/4" - not 5/8" but GregB was working from Karlson's drawing in the kit's manual

a single vent of about 12 sq. inches would be ballpark for a K12

all K12 seem to have the same size from 1954 to Karlson's death in 1973 - ~24.5" H x 16.75" W x 13.75" deep.




Karlson Evangelist

 

RE: Lowther PM6C in Karlson 12, posted on December 6, 2016 at 11:36:17
wclarson12
Audiophile

Posts: 19
Location: Hudson Valley NY
Joined: April 10, 2014
Why not a vertical slot?
Is there a reason? It works on the 15

 

RE: Lowther PM6C in Karlson 12, posted on December 6, 2016 at 19:35:58
freddyi
Audiophile

Posts: 3123
Joined: December 6, 2001
vertical slot is fine that's what I ment by 10-12 sq.in. vent. That's what I have in a "K10" size shown below with FE206EN and Beta10cx


Karlson Evangelist

 

RE: Lowther PM6C in Karlson 12, posted on December 11, 2016 at 11:33:02
moray james
Manufacturer

Posts: 1392
Location: Calgary on the Bow
Joined: May 19, 2002
love that look Freddy the color combination really works for me. moray james.
moray james

 

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