jl w6

Can anybody give me the specs for a 12 and 13 W6

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alright, thanks i am an idiot. do you think the box recomendations on their page is good?

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They spend a lot of time trying to get the most performance out of their subs.  I would have to assume that the box specs they reccomend are going to work really well with the speakers.

aight, on the site it  says for the port to be 12 1/2 x 1 1/2 x 29 and on the calculator on here it says for it to be 12 1/2 x 1 1/2 x 21 all of this at 32 Hz. which one would you go with?

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anybody?

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anybody?

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The enclosure recommendations on the JL site are net volume. If you did not account for bracing and port. This is where you are seeing the discrepancy. The site port calculator is accurate. If you plug in CORRECT information.   

All enclosure volumes listed are net internal volumes!
Box volume displacement, port displacement and
brace displacement must be added to obtain the final
gross internal volume.

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I looked back at the site and it said for the outside measurements of the box 26.25x14x13 which comes out to 2.058 cubic feet. Then do i calculate the port after i add the ports displacement to the area? My box is actually 24.75x14x13 which comes out to around ~1.93. What kind of brace should i add or do i need one?

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pcana11 wrote:

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I looked back at the site and it said for the outside measurements of the box 26.25x14x13 which comes out to 2.058 cubic feet.

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JL says they want 1.50 net. So you have to add the port area, driver displacement and any bracing to this number. I will break down the box from the JL site for you. Gross internal volume is 2.058. So we already have everything added in. So lets SUBTRACT everything away to see the NET volume.

Now that you have 2.058.subtract the port area which= 0.31467
2.058- 0.31467= 1.74333

Now we will subtract the driver displacement.which= 0.090
1.74333- 0.090= 1.65333

Now we take out the bracing. Which for the box on the JL site would only be the port wall. Roughly 0.1492
1.65333- 0.1492= 1.50413

Now after all that we have the net enclosure volume. (Vb) of 1.50 cubic foot. Now plugging this into the calculator with the port opening for 32.2Hz. Which is what the JL site says the enclosure is tuned and you get a port length of 28.915822625430142 That is 3/16 of an inch off the 29 inches. 29 inches simply by rounding up.

Still think the12volt slot port calculator is wrong?

Starting a box from scratch you would do the exact opposite of what we just did. You would start with your NET 1.50 ADD port area, driver displacement and bracing to figure out what your total gross volume needs to be. Then start working dimensions to achieve this within the space you have available.





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thanks for the help. I recalculated and it said to make mine around 32" long. Sound Right?

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pcana11 wrote:

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24.75x14x13 which comes out to around ~1.93.

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With these outside dimensions and port at 12.5 x 1.5 x 32 will tune you at about 32.6Hz I would say thats about right on.

Any reason for not doing the full enclosure dimensions from the site? They don't have to be the same outside dimensions, as long as the GROSS volume is still the same 2.058. Then the standard port from JL would apply. This would be the best configuration possible.

If however you are limited to going no larger than the dimensions you gave then as stated 32 inch long port will tune you to 32.6Hz Just remember anytime you change the port,you need to re figure the port area and apply it to get an accurate Fb. This can make for a lot of back and forth with the calculators to get it right. Hopefully with my laying the process out for you to see, you now have a good grasp on that. I feel as you have because your latest figures are correct.

Also if 1.93 is the largest you can go it will be fine. It not very far off JL optimal numbers. Output and response should be very, very close to there slightly larger recommendation.

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thank you, i do believe i can build my box to the correct specs with a good response. But thank you fo ryour time and help. I really appreciate it

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