Modern mid-size Karlson: the SK8 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th September 2011, 12:27 AM   #1
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
Default Modern mid-size Karlson: the SK8

Built according to the plan laid out by members of the Karlson forum as well as other K-builders, is the SK8 koupler. I built it to use with my Philips AD9710 fullrange drivers. It remains to be seen if they will work well in there, if they don't, I will likely get some FE206EN, as they worked very well in freddy's example.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

IG
  Reply With Quote
Old 17th September 2011, 07:13 PM   #2
diyAudio Member
 
Join Date: Oct 2004
Thanks for posting your build. The Karlson is a cab that I've wanted to build over the years but never got around to it. The size of the original for the 15" is a bit daunting as I already have too many large speakers. The SK8 is much more manageable. Please post your impressions/comments on the SK8 and if you have heard the K15, does the SK8 have that Karlson punch(?).
  Reply With Quote
Old 17th September 2011, 07:16 PM   #3
diyAudio Member
 
Join Date: Oct 2004
Oh yeah, great pictures, though the first few seem to make the SK8 look like it was built in the floor(!).
  Reply With Quote
Old 17th September 2011, 08:06 PM   #4
Nanook is offline Nanook  Canada
diyAudio Member
 
Nanook's Avatar
 
Join Date: Feb 2004
Location: Chinook Country.Alberta
Default you suck...

mainly because of the very nice build (and are SO much nicer than anything I can do). Very nice. I've often thought about Karlson enclosures. I bet the Pioneer B20FU20-51FW would be fun (if parameters are suitable , I know nothing about K-slots and the desired parameters..) if eNABLed with a coax tweeter added if need be.

__________________
stew -"A sane man in an insane world appears insane."
  Reply With Quote
Old 17th September 2011, 08:56 PM   #5
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
Quote:
Originally Posted by ultrakaz View Post
Oh yeah, great pictures, though the first few seem to make the SK8 look like it was built in the floor(!).
I thought the same when I first looked at this pic where the back of the curved reflector, made of oak ply almost blends with the floor.

While I have not heard K15, I have my K12 which have a nice punch with mid-Qts Richard Allan CG10T. Karlson usualy will do better with lower Qts, stronger motor, low Mms drivers, which I cannot I have tried yet in a larger K. I did not expect the high-ish Qts AD9710 to be perfectly at home in the 1.88cf SK8 as it did quite well in the 3.27cf K12. Will see how much tweaking it will take to make it sound decent if at all possible. Plan B is either FE206EN or AN Super8 CF.

IG

Last edited by IG81; 17th September 2011 at 09:00 PM.
  Reply With Quote
Old 17th September 2011, 09:01 PM   #6
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
Quote:
Originally Posted by Nanook View Post
mainly because of the very nice build (and are SO much nicer than anything I can do). Very nice. I've often thought about Karlson enclosures. I bet the Pioneer B20FU20-51FW would be fun (if parameters are suitable , I know nothing about K-slots and the desired parameters..) if eNABLed with a coax tweeter added if need be.

BOFU might lack top-end behind the wings, so a HF supplement might be good, either K-tube for the purist, or a coax tweeter, or a suitable horn on top, with a good blend to the Karlson.

IG
  Reply With Quote
Old 17th September 2011, 10:58 PM   #7
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
- ran a genuine BOFO in a "K10" size coupler and it sounded pretty good with a Karlson open ended waveguide on top. SK8 is little - going taller with the same footprint might give more punch
  Reply With Quote
Old 18th September 2011, 05:31 PM   #8
Greg B is offline Greg B  United States
diyAudio Member
 
Join Date: May 2004
Location: Los Angeles, California
Quote:
I bet the Pioneer B20FU20-51FW would be fun (if parameters are suitable
The parameters are not suitable. Try them in a TQWT, BIB, etc.

The SK8 is more suited to the Fostex FE206EN, or a driver with similar specs.

Frankly, Karlsons get trickier as they get smaller. IMO it's better to build a K15 or K12 for a first one.
  Reply With Quote
Old 18th September 2011, 06:07 PM   #9
diyAudio Member
 
Join Date: Nov 2007
Location: Dallas
Fig 6 curved reflector focuses to a horizontal line,
but exit between the K wings is a vertical line.
this will emphasize frequencies where horizontal
high order mode has a hot spot in the center.

If you make two curved reflectors face each other,
such the profile looks like a cukoo clock or old radio.
Then the focus becomes a vertical stripe, and won't
matter so much where the hotspot occurs, anywhere
upon the focus line will line up with the front exit.

You still need a wedge or scoop in there to knock any
sounds out that might otherwise resonate in a front to
back parallel wall mode. Though this is a much shorter
parallel wall problem than side to side modes were.

Three curved walls would be even better for purpose
of detuning high order junk, but the upper chamber
then becomes too small. We don't want to change
the original upper chamber internal volume so much.

I thought my Fig 666 was a good compromise? The
wings and back are better braced too. But nobody
has ever attempted to build one that I know of.
I am not in a favorable situation for woodworking
to test this theory anytime soon.
Attached Images
File Type: jpg Box3.jpg (91.0 KB, 82 views)

Last edited by kenpeter; 18th September 2011 at 06:16 PM.
  Reply With Quote
Old 18th September 2011, 08:37 PM   #10
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
A rough estimate of rear chamber size for moderate qts driver might be (Vas*fs*qts)/50 - without 9710 specs at hand I'd guess it would want ~K12's rear chamber volume. FE206EN in the Karlsonette is very punchy, FE206EN in SK8 is light on bass but very good in mids and highs. Somewhere there's a sweet spot for FE206EN and we've not quite hit it yet. The taller version of SK8 was prototyped and run in two configurations with the builder John Lapaire favoring the version based on Greg B's SK6.5 idea. I wonder how SK8 would do with FE166EN - ?

HAK8 thread (High Aspect K8) with pix and some measurements - JL thinks its got enough punch. GB's six inch K-coupler (which is about the same bulk and size as SK8) was roughed out too and under tweaking http://gainclone.com/Karlson/index.php?topic=1299.0

HAK8 and SK6.5 next to K15 Neither HAK8 nor SK6.5 have upper reflectors as their vents are at the very top of the front chamber.
Click the image to open in full size.

Last edited by freddi; 18th September 2011 at 08:45 PM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mid size 8" Karlson coupler for fullrange freddi Full Range 28 13th June 2011 04:23 PM
Reason cone mid-tweeters are no longer being used in modern speakers? Norris Wilson Multi-Way 0 20th April 2008 08:50 PM
Mid-range enclosure size query HTRookie Multi-Way 4 5th April 2007 02:30 PM
What are some decent drivers for a small/mid size center channel speaker (1 mid,1 tw) kehi Multi-Way 24 21st December 2003 08:10 AM
Increasing bass in mid-size speakers nietog Multi-Way 2 18th December 2003 09:46 AM


New To Site? Need Help?

All times are GMT. The time now is 03:26 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2