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<Two Sheets, 43Hz Folded Horn
<Two Sheets, 43Hz Folded Horn
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Old 22nd January 2018, 10:12 AM   #1
StainlessSteve is offline StainlessSteve  United States
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Default <Two Sheets, 43Hz Folded Horn

The design constraints are: it must have -3dB low point of at least 45hz (43 would be good), flat from 45-130Hz, no more than three and third sheets of 4x8 plywood, and be under 60 cubic feet and reach 129dB in half-space.
Here are the thiele-small parameters of my 12PLB100:
Re=5.5
Fs=43.07
Qts=.37
Qes=.39
Qms=6.99
Le=1.77 (1khz)
Mms=77.17 grams
Vas=70.17 liters
Xmax=9mm
Here is the drivers diagram: http://www.bcspeakers.com/media/W1si...Q/12PLB100.pdf

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Old 22nd January 2018, 10:48 AM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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Click the image to open in full size.
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Old 22nd January 2018, 11:05 AM   #3
StainlessSteve is offline StainlessSteve  United States
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Um, could I see some measurements on these?
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Old 22nd January 2018, 11:13 AM   #4
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by StainlessSteve View Post
Um, could I see some measurements on these?
I haven't measured them.
They could be scaled up to get more bass.
I have one with a Fane 15-600 in it and the bottom end is very good.

With the drawing shown it just needs one 8 by 4 sheet of 18mm plywood.
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Last edited by nigelwright7557; 22nd January 2018 at 11:17 AM.
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Old 22nd January 2018, 12:00 PM   #5
Kay Pirinha is offline Kay Pirinha  Germany
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How do you get acces to the driver if it needs repair or replacement?


Best regards!
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Old 22nd January 2018, 01:10 PM   #6
moray james is offline moray james  Canada
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Quote:
Originally Posted by Kay Pirinha View Post
How do you get acces to the driver if it needs repair or replacement?


Best regards!
you can simply install a door on one of the sides.
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Old 22nd January 2018, 02:11 PM   #7
Kay Pirinha is offline Kay Pirinha  Germany
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Oh dear! My eyes! Should have been reading "removable back"...
Best regards!
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Old 22nd January 2018, 05:05 PM   #8
RobWells is offline RobWells  United Kingdom
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Quote:
Originally Posted by StainlessSteve View Post
Um, could I see some measurements on these?
From the Fane book that drawing came from:
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Old 22nd January 2018, 05:10 PM   #9
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by RobWells View Post
From the Fane book that drawing came from:
A lot depends on the driver too.
I have two boxes, one with a Fane 12-50WRMS and another with a Fane 15-600WRMS drivers.

The 12 inch is quite bright sounding whereas the 15 inch has good low end but poor mids.

I made the back removable and the speaker mounted using t-nuts.
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Old 22nd January 2018, 05:20 PM   #10
globalplayer is offline globalplayer  Germany
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I doubt this enclosure design^ will reach -3db/45hz.
The driver has a qts of 0.37 which suggests a ported design.
Also the driver has a -3db at around ~140hz.
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