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Mass loading the sub box, a good idea or not.

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Old 05-05-2013, 10:00 AM   #1
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Mass loading the sub box, a good idea or not.

I have a JLW3v3 in a Supercrew sounds single side sub box. I notice when playing music, I have a really large cabin gain hump in the sound around 60Hz. I've played with the amount of stuffing in the box, endlessly tuned the parametric EQ on my head unit, and couldn't get rid of the hump. I finally decided to take some sound deadener that I had on hand from my install, and cut up tiles to stick to the inside of the box. I covered all the areas that I could, bottom sides and front panel and rear of the box. Then I took some CCF and lined that over top of the deadener. Pulled all the stuffing out, re-installed the sub, and now I have a cleaner, better sounding sub. Is mass-loading the box the right idea though, or should I look for another solution to this problem of the 60Hz hump?
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Old 05-08-2013, 04:40 PM   #2
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Quote:
Originally Posted by ZMan2k2 View Post
I have a JLW3v3 in a Supercrew sounds single side sub box. I notice when playing music, I have a really large cabin gain hump in the sound around 60Hz. I've played with the amount of stuffing in the box, endlessly tuned the parametric EQ on my head unit, and couldn't get rid of the hump. I finally decided to take some sound deadener that I had on hand from my install, and cut up tiles to stick to the inside of the box. I covered all the areas that I could, bottom sides and front panel and rear of the box. Then I took some CCF and lined that over top of the deadener. Pulled all the stuffing out, re-installed the sub, and now I have a cleaner, better sounding sub. Is mass-loading the box the right idea though, or should I look for another solution to this problem of the 60Hz hump?
How much air space is your box? Does it fall in the subs air space range according to JL?

Polyfill (Stuffing) is only tricking your sub to make it think there is more air space in the box that what is available.

If you put sound deadener in the box take it out. It isn't designed to go inside a box.
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Old 05-08-2013, 04:51 PM   #3
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can you put polyfill in a ported box and how much room do you gain by putting in the polyfill?
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Old 05-08-2013, 04:58 PM   #4
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Quote:
Originally Posted by pinktaco808 View Post
can you put polyfill in a ported box and how much room do you gain by putting in the polyfill?
Yes you can put polyfill in a ported box.

You don't gain a lot of room. Each setup is different. It's not a lot like .8ft.
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Old 05-08-2013, 06:29 PM   #5
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how much do you put in the box and that only for a box with one sub or two? or it doesnt really matter?
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Old 05-09-2013, 07:13 AM   #6
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Quote:
Originally Posted by Aw9d View Post
How much air space is your box? Does it fall in the subs air space range according to JL?

Polyfill (Stuffing) is only tricking your sub to make it think there is more air space in the box that what is available.

If you put sound deadener in the box take it out. It isn't designed to go inside a box.
Box is .65-.7 cu. ft. It does fall in the space range of the JL specs for a sealed box. You say to take it out, but after listening for a few days, it seems to have helped with the 60 Hz hump I had in the truck. I'm thinking the box itself was resonating at or near that freq., giving me that hump. I didn't put in much. Just patches on the back wall, on the front wall and on the base.
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Old 05-09-2013, 07:30 AM   #7
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It sounds like you have a box resonance. The best thing for that would be to brace the box with an internal brace.
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Old 05-10-2013, 07:46 AM   #8
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Quote:
Originally Posted by ItalynStylion View Post
It sounds like you have a box resonance. The best thing for that would be to brace the box with an internal brace.
The problem with that idea is the basket for the W3 is so big and the magnet so large, there's no where to put a brace. Any suggestions on where I might consider it?
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Old 05-10-2013, 09:04 AM   #9
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Redo the face of the box where the sub sits with 3/4 inch mdf
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Old 05-11-2013, 12:57 AM   #10
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What are you running for front speakers if anything? I would say if u have decent front components and they don't have a cross over you could be getting the extra peak from them.

Put the t/s parameters in to some box building software and see what the curve is like. Also do you have all bass boost and other extras off?
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Old 05-11-2013, 02:14 AM   #11
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If you have limited room for a brace it doesn't have to be a full width one. You could cut strips of 3/4" strips to sort of give it ribs on the inside. I do that sometimes depending on the setup. Just wood glue them in.
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Old 05-11-2013, 03:23 PM   #12
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Quote:
Originally Posted by ItalynStylion View Post
If you have limited room for a brace it doesn't have to be a full width one. You could cut strips of 3/4" strips to sort of give it ribs on the inside. I do that sometimes depending on the setup. Just wood glue them in.
I'll give it a try, thanks.
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