15" kicker l7 30hz box design help !! - Page 6 - diyAudio
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Old 22nd November 2011, 03:26 PM   #51
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by aakenator View Post
I changed my order with S15L74 ....and decided to go with Horn Loaded Box..aakenator
Hi, S15L74? The T/S may be different..I don't think a horn loaded box will be smaller than a stuffed Quarter-wave design: OD T-TQWT (Offset Driver Tapped- Tapered-Quarter-Wave -Tube) as mentioned earlier in the tread that would have wider BW than without OD.

Here is a comparison simulation showing the BW improvement of a OD type that should comprise at least two folds:
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File Type: gif Kicker_08 15inch L7 D2_T-TQWT_OD-TL_NeoDan-versus-b.GIF (76.4 KB, 158 views)
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Old 22nd November 2011, 03:30 PM   #52
NEO Dan is offline NEO Dan  United States
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Here they are
Click the image to open in full size.
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Old 22nd November 2011, 03:46 PM   #53
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Quote:
Originally Posted by NEO Dan View Post
Here they are
Click the image to open in full size.
Thank you Dan, Looks that the L7 parameters are interchangeable with the L74 in quarter-wave designs.

b
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Old 22nd November 2011, 06:28 PM   #54
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S15L7D4 in my home .

I will start making box this friday.[IMG]C:\Users\HP\Downloads\photo[/IMG]
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Old 27th November 2011, 10:10 PM   #55
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Click the image to open in full size.

Question, if S5 = 991.93 cm2 or 12.40^2", then why is the opening 16^2" or 1651.61 cm2? I get that the sub's outer frame is 15.625^2" and will fit easily in a 16^2" hole. Should the opening be 16" x 9.625" to match the 991.93 cm2 mouth?
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Old 27th November 2011, 11:57 PM   #56
NEO Dan is offline NEO Dan  United States
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In the design I posted I found in the HR model that there was no difference between the two opening sizes. bjorno liked the way the smaller opening modeled in the MJK worksheets, and if you don't mind building the driver into the box you can do the smaller opening. Please remember this is meant to be used with a HPF ~25-30Hz. If you build it please let us know what you think of it.
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Old 28th November 2011, 01:50 AM   #57
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by BP1Fanatic View Post
...Click the image to open in full size....Question, if S5 = 991.93 cm2 or 12.40^2", then why is the opening 16^2" or 1651.61 cm2? I get that the sub's outer frame is 15.625^2" and will fit easily in a 16^2" hole...
Hi, You're right, The simulation depends most on the S4 area and the length of L34.

The influence of S5 + L45 i is minimal. I thought NEODan added these in order to put emphasis on an actual built, larger, terminus area..
( It would be more correct when simulating, to decrease the L34 from 22 to at about 7.5 (= distance from the driver cone to the terminating port area center.).

I've shown before in other design suggestions: If a lid with a terminus port is used that normally 'visibly' covers ~2/3 of the entire cone area: If.. detached.., the T-TQWT turns into a OD-TL.

Thus, the length of the airways is shortened, a couple of Hz is lost for the lower end BW and more important: the FR curve is more or less 'chamfered' off.


Quote:
Should the opening be 16" x 9.625" to match the 991.93 cm2 mouth?
Thats' what I would prefer too but I would choose a terminus area of 7.5 x 20.5 placed as low as possible and increase the enclosure height 8.

b
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Old 28th November 2011, 02:32 AM   #58
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Quote:
Originally Posted by bjorno View Post
Thats' what I would prefer too but I would choose a terminus area of 7.5” x 20.5” placed as low as possible and increase the enclosure height 8”.
b
Following these instructions will not net the design I think you want b - the red one with the 113.34 L12? Please post an actual render so folks are not confused.
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Old 28th November 2011, 02:54 AM   #59
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Actually I am confused - Looking at your numbers I see this below. Is this what you are seeing S4=S5?
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File Type: png ODTL1.png (26.3 KB, 33 views)
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Old 28th November 2011, 04:11 AM   #60
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It's HUGE
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File Type: png ODTL.png (20.2 KB, 41 views)
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