$325 Lab 12 based PA tapped horn. ~35hz extension - diyAudio
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Old 17th March 2013, 01:52 PM   #1
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Default $325 Lab 12 based PA tapped horn. ~35hz extension

There aren't many 12" tapped horns for prosound. The Lab 12 is a great driver for the price, has a strong cone for tapped horn high(ish) compression ratios, and a good amount of Xmax.
12" tapped horns can be much skinnier than 15" and 18" horns, and with the price of the Lab 12 ($165) one can use 4-8 horns and not hurt the wallet too much.
With multiple horns as opposed to one or two large 18" horns, you have more options for stacking and setup.

Figure with the 400w rms rating of the driver, huge amps aren't needed to drive the cabinets to full output.

So here is the breakdown:
$165 Eminence Lab 12 (readily available, been around forever, now two voice coil options available)
$60 per 5x5' 3/4" Baltic birch (2 sheets required)
$40 for Casters, Durtatex, terminal, screws etc

Simple folding, easy to construct. Will have handles and casters for easy transport.
38" High x 30" Deep x 15" Wide cabinet (about 10 cubic feet or 300L)
Low corner of about 35hz
15" wide cabinet maintains truck packing dimms
Group of 4 plus 2000watt amp will provide plenty of output for as little as $1600 ($1300 for 4 cabinets plus $300 for amp)
This build is with the original 6ohm driver. The new Lab12c may also work, not sure.

Lets call it "PAL12 Subwoofer" For P.A. Lab 12 Tapped Horn


DIRECTORY FOR THIS THREAD

AutoCAD drawings, 2D: (post #123)
$325 Lab 12 based PA tapped horn. ~35hz extension

3-D rendering: (post #127)
$325 Lab 12 based PA tapped horn. ~35hz extension

Construction Technique, order of panel installation: (post #129)
$325 Lab 12 based PA tapped horn. ~35hz extension

Initial measured results: (post #82)
$325 Lab 12 based PA tapped horn. ~35hz extension



Now that the sub is constructed and tested, we can post some final specs.

Operating frequency:
34Hz----120Hz +/-3db

Dimensions:
30"x38"x15"

Impedance:
4 ohms

Power handling:
400w rms, 800w program High pass 32Hz 24db/octave minimum

Weight:
TBD

Last edited by m R g S r; 2nd July 2013 at 07:22 PM.
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Old 17th March 2013, 01:53 PM   #2
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More to come soon!
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Old 17th March 2013, 02:44 PM   #3
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From the first post it appears that you already have done the sim and the fold. You may have opted for a compression of about 2 1/2 to 3. This is very exciting as it will be a viable, cheaper and easier to transport horn.

In the Collaborative..... thread, the possibility of a PA TH with the LAB 12 driver was dismissed.

So you've got something really up your sleave!!!
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Old 18th March 2013, 01:51 AM   #4
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Old 18th March 2013, 04:21 AM   #5
tb46 is offline tb46  United States
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Hi Samuel Jayaraj,

Post #3: "...In the Collaborative..... thread, the possibility of a PA TH with the LAB 12 driver was dismissed...."

Would you have a link to that?

Regards,
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Old 19th March 2013, 03:02 AM   #6
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Here is the input screen...

Click the image to open in full size.

SPL at about 400 watts....i notice the large dip in the response. who knows if that will actually be there on the test cabinet; we will find out! (i know people say hornresp exaggerates the peaks and dips)
Click the image to open in full size.

and it should be right around xmax at 400 watts or so
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Old 19th March 2013, 03:13 AM   #7
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The Eminence Lab 12 for $165...
Eminence LAB 12 Professional 12" Subwoofer Speaker 290-570

The Heavy duty casters for $13.5 each
Penn-Elcom W8975 4" Fixed Caster w/Blue Wheel 330 lb. 262-274

Dayton Steel bar corner handles for easy transport, $9 each
Dayton Audio MH110 Right Angle Steel Bar Handle 262-820

Terminal Dish $4
Penn-Elcom D0604Z Dish Two Neutrik D Zinc 3-1/2" x 5-1/8" 262-332

$213 plus wood and screws / paint or coating for each cabinet....
Click the image to open in full size.
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Old 19th March 2013, 03:31 AM   #8
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All folded up, and sketched out:
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Old 19th March 2013, 03:41 AM   #9
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I originally simmed 4 parallel speakers and the response appeared to dig a little deeper. Now with one it appears to be a 40hz horn. Hmm.....but path length is 320cm sooooo

Compression ratio is 2.31 : 1.

Last edited by m R g S r; 19th March 2013 at 03:53 AM.
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Old 19th March 2013, 04:21 AM   #10
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Planning to account for or compensate for the air volume of the cone and baffle cutout?
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