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Old 12th May 2016, 11:55 PM   #1
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Default Tham15 with kappalite 12LF

Hi!

Short story: I built two tham 12 with some kapplite 12LF I had from dsimantled BFM T39. While being ok , I always tought there could be an improvement not because of the design which I think is amasing but mostly from what I heard from the experts ( specially JBells).Those drivers seem to like big cabinet

I did simulate the same speakers in the THAM15 and I got a revelation.
The simulation gives me similar output ( at 1 watt) as if you where using the original B&C 15". 100db @ 46.8dB, down to 98.4 " 75 and back to 100 @ 129.6hz

Two questions: 1-How do I post pictures of the hornresponse graphs?
2- Can any experts confirm my toughts? If so, what would be the best width for the cabinets?

I'm willing to give it a try and build one cabinet if it looks promising.

Thank in advance

Sylvain (Ze french dude from Montreal)
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Old 13th May 2016, 12:55 PM   #2
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Quote:
Originally Posted by slyslam View Post
1-How do I post pictures of the hornresponse graphs?
If you're using Windows 10, ALT-PRINT SCREEN will automatically save a copy of the open window to your OneDrive\Pictures\Snapshot folder. To post it to this forum, just click on the "Manage Attachments" button when creating your message - it should open a new page that allows you to select and upload images, which is what you can do for the image you just created.


Quote:
Originally Posted by slyslam View Post
2- Can any experts confirm my toughts? If so, what would be the best width for the cabinets?
I can confirm your findings. I've got a HornResp model of the THAM15 and I substituted the 8 ohm version of the Kappalite 12, and I'm seeing the same sim'd results.
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Old 14th May 2016, 05:42 AM   #3
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Quote:
Originally Posted by slyslam View Post
How do I post pictures of the hornresponse graphs?
See the post linked below:

Hornresp
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Old 14th May 2016, 04:33 PM   #4
Zwiller is offline Zwiller  United States
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Quote:
Originally Posted by Brian Steele View Post
If you're using Windows 10, ALT-PRINT SCREEN will automatically save a copy of the open window to your OneDrive\Pictures\Snapshot folder. To post it to this forum, just click on the "Manage Attachments" button when creating your message - it should open a new page that allows you to select and upload images, which is what you can do for the image you just created.




I can confirm your findings. I've got a HornResp model of the THAM15 and I substituted the 8 ohm version of the Kappalite 12, and I'm seeing the same sim'd results.
+1 same here but no cone volume data entered. While fooling I used 7000/860.50 from a 15 I think and although I lost a db at 50hz it brought low corner up to 96db @ 40hz... Me likey. Holding off sawdust until I find a <200l cab with 97db @ 40hz.
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Old 14th May 2016, 04:47 PM   #5
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Quote:
Originally Posted by Zwiller View Post
+1 same here but no cone volume data entered. While fooling I used 7000/860.50 from a 15 I think and although I lost a db at 50hz it brought low corner up to 96db @ 40hz... Me likey. Holding off sawdust until I find a <200l cab with 97db @ 40hz.
You could try rejigging the sim in HornResp, then using my THAM spreadsheet to work out the folding of the horn. Getting it at or above 97dB in a sim in HornResp with a cabinet that small is likely going to be a challenge however. This is the best I could do so far, using an SS15-type fold. I'm not even sure if it can be folded up into a horn and still keep the same sim parameters, LOL.
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File Type: png 2016-05-14.png (25.1 KB, 77 views)
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Old 14th May 2016, 05:30 PM   #6
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Here are the two output graph. Still try to figure out what makes such a huge difference between both. I suppose it's the lower BL.

One question: I built my tham with 15mm Baltic Birch. Do you think I could use the same thickness for the THAM 15 or should I stick with the original 18mm to avoid resonance?

tks
Sylvain
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File Type: jpg Tham 12 KL12LF.jpg (80.5 KB, 71 views)
File Type: jpg tham15 KL12LF.jpg (76.3 KB, 69 views)
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Old 16th May 2016, 06:43 PM   #7
Zwiller is offline Zwiller  United States
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If you're comparing 4ohm with 8ohm I noticed that too, but not really sure why. I think the ply thickness aren't a huge concern as long as it properly braced but tend to look at 15mm as lighter duty/install and 18mm being a bit more road worthy.
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Old 17th May 2016, 10:13 AM   #8
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in windows 7 and 10 press the 'windows' key and type in 'snip' it much easier then using printscreen.
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