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Old 21st December 2015, 06:32 PM   #1
Parm is offline Parm  United Kingdom
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Default JBL gto 1202d subwoofer

I've randomly picked up one of these for an absolute song today and now need help in designing an enclosure. I've got a meaty Crown amp that bridges mono, it will supply more power than the sub needs but I think I can be sensible with it. I will be using a mini DSP for all signal processing, cross over and eq duties.

But here's the issue, can anyone help me design or even recommend a suitable enclosure. The size isn't a problem neither is any of the construction.

Music I listen to is, reggae, house, garage, dub step, etc etc

Oh the parametrises are freely available on the web but I don't know how to attach them here.

Help much appreciated
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Old 21st December 2015, 07:39 PM   #2
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Hmm I wonder how that driver would model in a tapped horn...
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Old 21st December 2015, 07:45 PM   #3
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https://www.google.co.uk/search?clie...obile-gws-lite..

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Old 21st December 2015, 07:51 PM   #4
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At a guess i would say a large low tuned ported enclosure is best for this one. Most dubstep has 30-40 hz bass as the low resounding fundemental note, however I have some ole scool stuff with strong 25hz content.

Seeing as its a 12" driver, for a half decent volume and good close to but not in corner placement i would recommend 25hz - 30hz for your tuning frequency.

Could alternatively seek advice and modeling for this driver in a tapped horn.. Can be a tall piller with a small footprint and offers substantial gain over a ported enclosure.
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Old 21st December 2015, 08:00 PM   #5
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Ya unless its to go in a huge room i would recommend a lower tuning than most would, tends to sound less 'boomy' if the port starts contributing. > 40-45 hz and below, with direct radiation creating most of the > higher 'punchy' content, and the helmhomeys resonator outputting the more resoundy lower type waveforms found in dubstep etc.

Last edited by WaVeInFoRm; 21st December 2015 at 08:02 PM.
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Old 21st December 2015, 08:11 PM   #6
Parm is offline Parm  United Kingdom
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Quote:
Originally Posted by WaVeInFoRm View Post
At a guess i would say a large low tuned ported enclosure is best for this one. Most dubstep has 30-40 hz bass as the low resounding fundemental note, however I have some ole scool stuff with strong 25hz content.

Seeing as its a 12" driver, for a half decent volume and good close to but not in corner placement i would recommend 25hz - 30hz for your tuning frequency.

Could alternatively seek advice and modeling for this driver in a tapped horn.. Can be a tall piller with a small footprint and offers substantial gain over a ported enclosure.
Ok large box with tuned port is reminding me of car audio I was involved in from yesteryear. How do I go about obtaining a box size, port die soon etc. can you help ?
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Old 21st December 2015, 10:13 PM   #7
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I know you can use simple box simulation software on the web where you enter driver specs and chose box dimensions and port length and diameter etc and it calculates frequency response, max spl for xmax etc.

Although, I would wait for another reply, im sure someone else can recommend a more accurate approach.

For a general idea can be good though to have a play.
A piller type tapped horn is an option if u can cross it at about 80hz, but its driver dependable.

Personally I would wait for more imput before progressing beyond the play/idea phase.

Just dont know enougth to correctly advise further as no pdf reader on phone for specsheet etc.

Just will guess instead.. someone may correct me if i am correctable rightfully.
..being a car sub its prob v 'stiff' built to be lower efficiency with higher power handling, relying on cabin gain to boast tge low end abd designed for a tight small sealed cab or fairly small ported cab..

Though im not sure what tuning frequency..

What im saying is awat more advice because the sub may not work well in a lower tuning larger box, though it should, best to do some sims and if lazy or neewbie abit get someone else to lol.. I would hav a go if had a pc to hand.
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Old 21st December 2015, 10:25 PM   #8
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Yep was correct, its primary intended for a car so smaallish box designs.

This may help ppl, specs.
http://www.abtec.co.nz/JBL-GTO1202D.php them girraphs provided i wouldnt trust much.

However.. Google image searching the driver finds alot of sub builds, prehaps can findya summin there.
Intuition says a lower tuning is perfectly doable/better for a home sub. more advice is my advice

Last edited by WaVeInFoRm; 21st December 2015 at 10:28 PM.
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Old 21st December 2015, 10:43 PM   #9
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Found a 2 cubic foot tuned 35hz one
Sorta a 'golden mean' to these helmzholmzy resonator tings

I would guess 2.7-3.3feetys tuned 30/26hz

Random brain calculation.. best have a play.
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Old 21st December 2015, 11:10 PM   #10
Parm is offline Parm  United Kingdom
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Thanks dude, much appreciated
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