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  1. #1
    Join Date
    Jun 2018
    Posts
    13

    Default Installing JL M7 IB subwoofer in Helix

    This was pretty scary to do without pictures due to limited clearance so I figured Id post what I did and see if it helps anyone.

  2. #2
    Join Date
    Jun 2018
    Posts
    13

    Default

    First, I used my router to cut a template of the surround. I then marked on it where the screws go and mounted my surround template

    26115E2B-574C-4B27-A1AC-69DCE4CCA747.jpg

  3. #3
    Join Date
    Jun 2018
    Posts
    13

    Default

    While there has to be a better way, all I could think of was a Dremmel with a carbide tip attachment. I used this due to limited clearance for a router or jig saw. Took a bit as the Dremmel got hot and I’d have to let it cool.

    0884408D-9B33-4FFD-A32C-7949CB9BA3C2.jpg

    Turned out pretty good for the hole:

    7B5920A2-6740-40F4-B3F9-A199BAF39904.jpg

  4. #4
    Join Date
    Jun 2018
    Posts
    13

    Default Done

    And the final product:

    B45CD1B8-3D3C-4685-B013-D8CED10611AE.jpg

    It is pretty loud, but lots of dash rattles. Im going to mat it and have closed off some of the holes on the back of the dash with some success. Ill get to looking with what people here did to solve that issue.

  5. #5
    Join Date
    Aug 2020
    Location
    Middle Tennessee
    Posts
    736

    Default

    I've had good luck with this stuff to knock down rattles
    https://www.amazon.com/Noico-deadeni...xpY2s9dHJ1ZQ==
    2020 Supra SA

  6. #6
    Join Date
    Jun 2008
    Location
    Henderson, NV
    Posts
    7,043

    Default

    looks great...
    hardest part is putting the first hole in the boat. gets easier now
    '06 Supra Launch 20SSV-gone but never forgotten

  7. #7
    Join Date
    Jun 2018
    Posts
    13

    Default

    Quote Originally Posted by SONIC View Post
    I've had good luck with this stuff to knock down rattles
    https://www.amazon.com/Noico-deadeni...xpY2s9dHJ1ZQ==
    Ordered today - May need some bracing too as dash moves a lot. What do you think about putting the 315 foam on top of the base later - know some auto guys doing the same 80mil you recommend then putting the 315mil rubber on top of that for more deadening.

  8. #8
    Join Date
    Aug 2020
    Location
    Middle Tennessee
    Posts
    736

    Default

    I haven't used the red but have read good things about it for sound deadening uses.
    I don't know how much it will help for this though as you're not trying to block sound you're really just trying to stiffen the glass and absorb some of that energy before it gets to the glass.
    Mass loaded vinyl may be a good option it's super dense and absorbs a lot of the energy of the sound wave vs stiffening the panel like the butyl stuff.

    A little pricier though.

    https://www.amazon.com/Loaded-Barrie...ustomerReviews
    2020 Supra SA

  9. #9
    Join Date
    Jun 2018
    Posts
    13

    Default

    Actually most the vibration turns out to be between the glass and the softer dash material. Some moderate density foam really dampened it well. May lay the vinyl on the front side, but really loud without rattles locally now - more distant things start to make noise of course.

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