Mini Karlsonator (0.53X) with Dual TC9FD's - Page 57 - diyAudio
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Old 5th April 2014, 01:23 PM   #561
Carlp is offline Carlp  United States
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Quote:
Originally Posted by xrk971 View Post
Blaides,
That sounds like a good idea. If FC panels were long enough you could make the entire speaker out of one long strip! Glue second panel for the double layer portion.
Oooh. I hear a challenge... What about your tiny box?
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Old 5th April 2014, 08:18 PM   #562
BL21DE3 is offline BL21DE3  Scotland
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Quote:
Originally Posted by xrk971 View Post
Blaides,
That sounds like a good idea. If FC panels were long enough you could make the entire speaker out of one long strip! Glue second panel for the double layer portion.
Thanks for the idea. As my sheet is 841mm long I can easily do this.


Quote:
Originally Posted by Carlp View Post
Oooh. I hear a challenge... What about your tiny box?
Challenge accepted

Sheets have been cut and are awaiting assembly .
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File Type: jpg IMG_20140405_191820886.jpg (264.8 KB, 311 views)
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Old 7th April 2014, 03:05 AM   #563
xrk971 is online now xrk971  United States
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Ok Blaides,
Did you glue her together yet???
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Old 7th April 2014, 07:33 AM   #564
BL21DE3 is offline BL21DE3  Scotland
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Hi X,

I haven't got round to gluing yet, other 'DIY' got in the way. But everything is pretty much ready to assemble, I just need to fold the baffle to shape. I was experimenting on scrap foamboard to get the depth etc. right before committing to the real baffle. Hopefully I'll get a chance tonight to get gluing.

With regards to bracing in the 0.4x version, I take it an approach like the one you used in your 0.53x build would be advisable?
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Old 14th April 2014, 11:26 PM   #565
xrk971 is online now xrk971  United States
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This is a nice amp for mini Karlsonator:

TDA7297 and Karlsonator
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Old 15th April 2014, 02:52 AM   #566
AZDoug is offline AZDoug  United States
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XRK, if I were to make a karlson speaker with 4 vifa drivers, how large should it be.
Also would it be better if the 4 drivers were in a square 2X2 pattern, or a tilted
2x2 diamond pattern. Been too busy lately with life to mess with DIY speakers for awhile. I might have time later this week, to build some.
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Old 15th April 2014, 03:39 AM   #567
xrk971 is online now xrk971  United States
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AZDoug,
If you want to do the 2x2 driver in a mini Karlsonator, it won't get your any higher efficiency in series/parallel wiring. However, you will lower the distortion significantly as the cones move less. I would do a diamond config in a 0.75x scale in height and depth and 0.53x scale in width. You may want to use a 4 ohm + 1 mH + 1 uF BSC circuit (all in parallel) as the four drivers now will have more mids/highs compared to bass of two drivers.
Good luck,
X
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Old 15th April 2014, 04:30 AM   #568
xrk971 is online now xrk971  United States
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AZDoug,
You may have to scale the width by 0.75x as well to have enough room for the diamond array of drivers. It will make a peakier bass at low end but can be adjusted with stuffing.
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Old 16th April 2014, 09:24 AM   #569
Morfeus is offline Morfeus  Germany
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I have two Peerless HDS PPB 4-25 8Ohm and two Fostex FT 17 H Horn Tweeters - 8 Ohm.

Would those work in the Mini Karlsonator? I am looking for small size and as much bass extension as possible. I could add a H-frame sub with Eminence Alpha 15 though.
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Old 16th April 2014, 03:49 PM   #570
DeonC is offline DeonC  South Africa
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Default Mega-Karlsonator?

Hi guys

I am sorry to come into this thread sideways, but I would first like to hear if my idea is viable at all before I start a whole thread on it.

I want to build a pair of high quality subs for home use. The drivers I am going to use for this sub are the 13" Leak Sandwich bass drivers. I already have 1 pair of ceramic bass drivers and 1 pair of alnico drivers. I am going to get another pair of each for the sub idea I have in mind. Each box will have two ceramic and two alnico drivers in. I will be quad-amping each sub. One of the main box design ideas for I have in mind is a mega-Karlsonator, and I want to know if it will work.

The boxes that I am planning to build will be 188cm (1.88m/74"/6.16ft) tall x 57cm (22.44") wide x 55cm (21.65") deep. The internal measurements will be 182cm (71.65") x 51cm (21.08") x 49cm (19.29"). With that height it will be a real mega-Karlson to start with, but I want to make it a Karlsonator (Karlson crossed with TQWP) design. I estimate with the height of the box that this design should go down low, very close to 20Hz at the bottom end. The problem is that I don't have any TSPs for any of the drivers, but I will also be buying the Dayton measuring suite, and I will be measuring each individual driver. But before I even start that, I want to know if such an idea will work at all. If the Karlson experts give the green light for this idea, I will create a new thread on the Subwoofer forum. Here is a pic for my idea:

Click the image to open in full size.

Thanks,
Deon
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