Very Strange Sub or Box Noise? HELP!

[carshateme]

head above the magnet? what do you mean?

both subs are mounted upside down (and ported) and when i put my head on the top of the box (closest to the magnet) they both make a noise when they play music, im going to assume every time the sub push's in and out, and even if the song does not have alot of bass the whole box shakes when it does it.

Make another video, place the camera where the subs are. Could help us out a little bit.

[deathcards]

if its a sealed enclosure it is not sealed properly had that happen once thx to broken screws, could be a few things if it is ported -6 bass and 10 sub lvl doesn't sound right at all

Edited January 15, 2012 by deathcards

[Baydestrian]

NVM

Edited January 15, 2012 by wonderbreadSTS

[Ric Thornton]

Hi, i have 2 12" JL w6v2's just bought from a JL authorized dealer, and a custom box they built with the subs facing down and port out the front.

When the subs play anything below 30hz they make a very werid rattling noise, it is bearable but noticeable enough to have me worried(Almost sounds like a knocking). I can not tell if its the structure of the box or the actual subs making this noise, Any and all opinions are welcome !!

http://www.youtube.c...eature=youtu.be

---Happens at ---

3-5 seconds

13-15 seconds

22-24 seconds closest to side of sub woofer

---------------------------------------------

JL Audio actually faxed the dealer the box design claiming it would work best in a softtop vehicle

HD 1200.1 amp

Head Unit Settings From Dealer

Bass = -6

Sub = +10

Treb = 0

Fade = +R2

sounds like your box is coming apart a friend of mine had the same issue pulled the carpet back off the box and you could see it coming apart just a thought

This is what I'm thinking it is.

Sounds like you are simply bottoming the sub out. Basically over excursion, causing the coil to hit the bottom of the motor. Usually a result of playing below tuning with no subsonic filter set.

What is the box tuned to?

This was my first guess. The problem is if it plays20hz fine, and 40hz fine... but makes that noise at 30... that rules out the subsonic and points more towards sub or enclosure.

Sounds like you are simply bottoming the sub out. Basically over excursion, causing the coil to hit the bottom of the motor. Usually a result of playing below tuning with no subsonic filter set.

What is the box tuned to?

Yikes, i will have to call the guy and ask what the box is tuned to. Didnt know you could bottem out at 30 HZ but play 40hz and 20hz just fine? the subs do make a clapping noise almost when bass plays if you lay your head near the box, ( no matter what song )

It could possibly be a loose dustcap too. I believe those JL subs use a full cone dustcap on them, so it should be easy to tell if that's loose. Sounded just like that when my friend's dustcap came unglued. If so, take care of it right away. We didn't get it taken care of immediately with his sub and the dust cap flew right off taking a good chunk of the cone with it.

Pull the sub out and free air it, but be careful with the volume. See if it still makes that noise. Should rule out whether it's the box or not then.

This will rule out the sub or the box itself. If the noise goes away free air, then the enclosure is most likely coming apart. I'm not sure how the shop built the box, but if they do what most do... then it's glued and stapled (air nailed) together. I don't care what anyone says... use screws.

[carshateme]

yeah, I don't get the why they use staples....I only use staples in the corner of my box, so my screws don't split the board.