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Full Range Build, 12" driver...
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Old 6th December 2017, 02:18 PM   #651
Ivo is offline Ivo  Netherlands
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Like this? Is this also an acoustic lens?

Click the image to open in full size.
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Old 6th December 2017, 02:22 PM   #652
Ivo is offline Ivo  Netherlands
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I guess it is, pathlength is shorter than the plate lenses shown so far. Perhaps related to bandwidth. It looks interesting as well. An interesting mix of the simple path of a plate lens, with the circular form factor of a round perforated lens.
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Old 6th December 2017, 04:43 PM   #653
sbcrx007 is offline sbcrx007  United States
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The Klam would probably be an application then too I guess, I just don't know too much about it. And it's really only worth thinking/talking about if the lens plates still work if they are shortened considerably width-wise. You could even place a lens right inside the K-aperture or coupler and have the lens plates go right out to meet the curtain edges, so there would just be a neat looking louvered section in the center. It would look killer, but I've no idea if it would sound good at all!
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Old 7th December 2017, 01:35 AM   #654
freddi is offline freddi  United States
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Full Range Build, 12" driver...
fwiw, Karlson's klams from the little KR5 Rocket to APX/Oliver Phase III and AP100 (assume "Magna Clam" were vented - whether effective or not = ? The little Rocket used a weak motor radio speaker. Oliver's Phase II used an alnico magnet 10" guitar speaker. AP100 used an Altec 421 15" speaker and a K-tube.

A cardboard mini klam front with typical angles of 30-40 degrees, suspended in front of the whizzer would deflect highs downwards and spread them - how smoothly = have to decide "by ear". It would be worth 10 minutes of time to make and try one.
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Old 7th December 2017, 02:05 AM   #655
sbcrx007 is offline sbcrx007  United States
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Here's a picture of the 2nd concept
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File Type: jpeg Resized_20171206_212744.jpeg (240.2 KB, 124 views)
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Old 7th December 2017, 02:15 AM   #656
sbcrx007 is offline sbcrx007  United States
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Quote:
A cardboard mini klam front with typical angles of 30-40 degrees, suspended in front of the whizzer would deflect highs downwards and spread them - how smoothly = have to decide "by ear". It would be worth 10 minutes of time to make and try one.
Freddi - I thought we said before a k-aperture wouldn't disperse the highs from a narrow dia whizzer? 30-40 deg from vertical or horizontal? Its certainly worth a try in cardboard, good point... Im finally back around to looking at the XKi design for the Fane by Xrk too.

Jesse
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Old 7th December 2017, 04:04 AM   #657
freddi is offline freddi  United States
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Full Range Build, 12" driver...
it would disperse "something" and have some downwards or upswards direction property. The power response of fullrange drivers can leave a big hole above 3K. You wouldn't want the paper klam very wide - maybe try like your mini plate lens - if its garbage, well at least you know.

I think the angle in K's illustration (hacked) below was 30 degress elevation - you could try 40 making the aperture steeper and top plate shorter.

I used a 40 degree mini klam on a one inch format compression driver (slot facing "down" as in that drawing - oddly it seemed to pretty much kill output above the flat upper part.

A. Weiiss' patent image shows a 40 degree version - don't know if the cone speaker was really used or just for illustration
- his product had a metal lens for a one inch format Eminence compression driver. I'm guessing that lens was about 1.25" square where it mounted over the compression driver's exit. Story goes that lens/driver in a system was evaluated and rejected as
it sprayed highs everywhere (vs THX controlled spec)

http://patentimages.storage.googleap...S5943431-1.png


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Last edited by freddi; 7th December 2017 at 04:16 AM.
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Old 7th December 2017, 06:05 AM   #658
KaffiMann is offline KaffiMann  Norway
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Quote:
Originally Posted by Ivo View Post
Like this? Is this also an acoustic lens?

Click the image to open in full size.
Yes, that was what I assumed someone must have made sometime.

Edit:
Here it is on the speaker units:
2x SIEMENS Klangfilm 10" COAX speaker - ACOUSTIC LENS | #135558015

Edit2:
A bit OT, but never heard of Kinap Lomo before, looks nice:
KINAP LOMO speakers 11" 25GD-18-22 KLANGFILM FULL-RANGE USSR 4pcs | eBay

Edit3:
Nice square lenses from Japan, not too expensive for the pair:
JBL 2308 / L91 TYPE Kenrick Sound Acoustic Lens pair SET NEW From Japan | eBay

Last edited by KaffiMann; 7th December 2017 at 06:30 AM.
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Old 7th December 2017, 12:36 PM   #659
Ivo is offline Ivo  Netherlands
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Lomo, not a very promising name. Interesting but coloured. ;-) (Referring to the Lomography style of photography.)

It looks different than I would have expected though. I would assume narrow fins/short pathlength at the center and broad fins/longer pathlength toward the edge of the cone.
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Old 7th December 2017, 01:42 PM   #660
KaffiMann is offline KaffiMann  Norway
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This is very similar to what I expected, you are interested in spreading out the high frequency sounds that come from the wizzer, not the lower frequencies that come from the main cone.

I read some paper about circular diffusers, but it seemed to be for focusing sound of 100khz, so a bit higher up than I can hear.
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