JL Audio 12W0-V3-4 - AVS Forum
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post #1 of 17 Old 07-03-2013, 10:14 AM - Thread Starter
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Hey all,

Looking to build 2 subs based on the Jl Audio 12W0-V3-4 for home cinema use. The specs on JL's website for a box look very small, and i'm not sure wether i should go for ported or not, or if that would make it too loose sounding.

Any advice on how i should build my boxes would be greatly appreciated!

Cheers in advance!
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post #2 of 17 Old 07-03-2013, 10:29 AM
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how big is the room where they will go?

how loud do you like to shoot for?

any constraints on how big they can be?

ported/sealed if done correctly cannot
be readily distinguished. this was proven
recently in a blind test of avs members.

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post #3 of 17 Old 07-03-2013, 10:34 AM - Thread Starter
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It's a fairly small room. Probably 10' x 18'. Not overly loud, just enough to produce a balanced sound. No size constraints.

Cheero
Grant
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post #4 of 17 Old 07-03-2013, 10:48 AM
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here is one option:

300 watt plate amp
6 cubic feet
slot port 2.5" high x 14" wide x 24" long
tuning: 23.3 hz


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post #5 of 17 Old 07-03-2013, 10:54 AM
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here is another option:

300 watt plate amp
5 cubic feet
two round ports, 4" diameter, 24" long
tuning: 22.3 hz



this is a ground plane model, so you will get
some room gain below about 30hz in your room.

the rolloff won't be quite as steep.

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post #6 of 17 Old 07-03-2013, 10:57 AM
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this one adds a 3 cubic foot sealed at 300 watts for comparison (blue).


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post #7 of 17 Old 07-03-2013, 10:59 AM - Thread Starter
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I like this curve. How would i go about building the slotted port? Can you suggest some dimensions?
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post #8 of 17 Old 07-03-2013, 10:59 AM - Thread Starter
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and what if I want to use an external amplifier?
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post #9 of 17 Old 07-04-2013, 05:45 AM
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You can use an external amp no problem, heck, it might even make the enclosure easier to build without having to worry about cutting a hole for the plate amp. I would recommend using a Behringer EP4000 as they are very powerful and somewhat cheap.
(note that I am looking to sell my EP4000, so if you or anyone else is interested, please PM me) If you want to know more about all of the enclosure stuff, I recommend downloading winISD from HTguide and do some modeling of the different enclosures so that you can see what would work best for this. You can run dozens of different possibilities in that software program.

I would recommend a different sub though as I have never been all that impressed with the JL w0's. I used to run duel JL 10w7's in a sealed box and it worked great. I wish that those JL 13w7's were not so darn expensive as I bet they would kick but, but for the money that you would spend on the 13w7's you could get some TC-Sounds LMS Ultra's and they would most likely leave the 13w7's in the dust.

As far as the slot port goes, look in the master subwoofer build thread for other peoples builds that have used slot ports. They are actually fairly easy to make, but it is hard to explain. Basically you build a tunnel that goes from the bottom of the box, all the way along the bottom then curving up at the rear of the enclosure following the rear wall up until the desired length of the slot port ends. Hope this helps, you might be able to better understand if you can find an existing build with pictures of the slot port design and build process. Good luck! I am looking forward to seeing how these JL w0's turn out! I hope that I am wrong and they really do end up sounding great!
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post #10 of 17 Old 07-04-2013, 07:03 AM
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Quote:
Originally Posted by granttickle View Post

It's a fairly small room. Probably 10' x 18'. Not overly loud, just enough to produce a balanced sound. No size constraints.

Cheero
Grant

You may want to factor in room gain. Nearly flat to 20hz is all well and good in an anechoic chamber, but the low end might be a bit to much vs midbass in a small room.

I started a Jl12w0 build awhile back, but haven't had the time to finish it. They have nice extension for car subs.
Good luck with the build smile.gif
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post #11 of 17 Old 07-04-2013, 03:49 PM
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You will also need highpass filters. and 300 watts would put that driver far past xmax with that low of a tune. Around 150 watts per sub would be a good match.
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post #12 of 17 Old 07-04-2013, 11:29 PM
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it is actually just a hair over xmax with 300 watts, which is fine.

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post #13 of 17 Old 07-05-2013, 07:44 AM
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I got around 19mm (11.4 mm xmax) with 300 watts after applying a balanced high pass filter. We are talking 2 separate 5-6 cube boxes right? Not one box with 2 drivers?
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post #14 of 17 Old 07-05-2013, 10:16 AM
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here is the excursion for the sub in post #5 with 300 watts (yellow), and
300 watts with 2nd order high pass filter (blue).

12-13 mm excursion around 33hz which is no problem.

the difference is probably what you are doing with the "balanced" high pass filter. i'm not sure what you are doing there.

11.4 is also the overhang, so the damage point is likely up at 20mm one way or higher.


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post #15 of 17 Old 07-05-2013, 04:11 PM
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Balanced as in similar excursion above and below the port tune, but your right, I think I was fooling around with an 18-20hz tune when I got the 19mm excursion, and it wasn't as balanced as I thought. Both the example in post 1 and 2 give me around 15 mm excursion with a 2nd order high pass right below the tune.

It's good to let Grant know that the examples in post 4 and 5 we're without the high pass filter though, and that it is necessary to add them.
It looks like they will be relatively flat after the highpass filters and room gain.
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post #16 of 17 Old 07-05-2013, 07:00 PM
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re:balanced. i see what you are saying
just never heard it called that. yeah,
a high pass would be a good idea depending
on how the driver deals with being pushed
way out of bounds. personally, i would
include one. the 300 watt bash amp comes
stock with one around 19hz or so, which would
be good. there are some other options.
a behringer mic2200 has a high pass feature
as well as two bands of parametric eq for about
a hundred bucks. there are some other options,
but i can't think of any really low cost ones
at the moment.


"and what if I want to use an external amplifier?"

such as?

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post #17 of 17 Old 07-06-2013, 02:52 PM
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I figured there would be passive high pass filters available at place like parts express. However I couldn't track down any that deal with the subsonic frequencies.
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