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12" Sub Box Plans

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ZeroT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZeroT Quote  Post ReplyReply Direct Link To This Post Topic: 12" Sub Box Plans
    Posted: 28 March 2011 at 5:20pm
I have been reading the site with great interest and I am now planning to build a box/boxes for 2x12" subwoofers.

The box(s) will be used in a relativly enclosed space inside a 12m x 6m marquee to around 50 people, the marquee will be sealed with the sides down.

I already have a pair of JL car audio subwoofers laying around in the garage so I plan to use these, all the specs can be found here http://mobile.jlaudio.com/pdfs/8-12W6_BDS.pdf

Can you recommend a design and wheather I should make a single box for both drivers or 2 boxes.
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Tony Wilkes View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Wilkes Quote  Post ReplyReply Direct Link To This Post Posted: 28 March 2011 at 5:23pm
The PDF has a recommended box for each driver why not use that?

Tony
www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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ZeroT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZeroT Quote  Post ReplyReply Direct Link To This Post Posted: 28 March 2011 at 6:22pm
Sorry, this should have gone in the plan requests section too.

The standard 4 sided box designs work well in the boot of a car but dont seem to work all that well outside of such an enclosed space.

I didnt know if a 'non car design' might work better after seeing all the various designs on here.
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_djk_ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2011 at 12:19am
The only way those will be acceptable will be in a front loaded horn.

Edited by _djk_ - 29 March 2011 at 12:05pm
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ZeroT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZeroT Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2011 at 10:38am
what about the Tuba 30?  Does anyone have the plans for them?

http://www.billfitzmaurice.com/T30.html
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Centauri View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Centauri Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2011 at 11:14am
I suppose Bill does - as well as anyone else who has paid for them .....
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ZeroT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZeroT Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2011 at 12:23pm
sorry i meant if anyone has the plans do they know if it will work for the spec of my subs.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mautopsy Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2011 at 3:17pm
dont use a car speaker, sell them and buy drivers specified for the design you want. 
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_djk_ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 30 March 2011 at 4:49am
I can do a design for you in Hornresp, give you the throat area, chamber volume, length, and mouth area. You can look at other designs to figure out the build details.
 
For reference, look at a Punisher (search).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2011 at 12:28pm
JL 12W6 parallel coils.

2Pi 2.83V
300cm throat 5000cm mouth 250cm length
18L rear chamber 1L front chamber
433L net volume

105dB/2.83V/1M average level, -5dB at 40hz, needs a 3dB cut at 110hz, ±2dB 44hz~110hz (with 3dB cut at 110hz), 40V RMS (400W/4Ω) displacement limited maximum, 128dB at 45hz, 4Ω average impedance.

djk
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