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Thread: Car Audio and Subs

  1. #11
    nom nom nom RedSN's Avatar
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    Hhhmmm, interesting idea Vic. What about just using the single Alpine 4-channel amp? Using channels 1-2 to drive the 6x9 door 3-ways, and bridge channels 3-4 to drive the 8” sub?

    Obviously this project is going to be a learning experience. Really appreciate all the help and suggestions so far.
    -Don____________

  2. #12
    nom nom nom RedSN's Avatar
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    Ripped out the passenger side jump seat.



    Mocked up the amp and sub location, and marked up the proposed box.



    Thoughts? Ideas?
    Going to mock up a cardboard box next to nail down the final dimensions. Initial volume calc is about .8 cu.ft.
    -Don____________

  3. #13
    nom nom nom RedSN's Avatar
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    LOL, my cardboard sub box



    Any reason why everybody seems to use MDF? Is there a reason not to use plywood?
    -Don____________

  4. #14
    Voodoo 1 Ghost Rider's Avatar
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    Quote Originally Posted by RedSN View Post
    LOL, my cardboard sub box



    Any reason why everybody seems to use MDF? Is there a reason not to use plywood?

    Plywood flexes, MDF will not, less vibration

  5. #15
    Voodoo 1 Ghost Rider's Avatar
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    Quote Originally Posted by RedSN View Post
    Hhhmmm, interesting idea Vic. What about just using the single Alpine 4-channel amp? Using channels 1-2 to drive the 6x9 door 3-ways, and bridge channels 3-4 to drive the 8” sub?

    Obviously this project is going to be a learning experience. Really appreciate all the help and suggestions so far.
    No your going to want two separate amps, especially if your running tri-ax 6x9's unless that amp has a dual cross over for separate channels, otherwise your going to have highs running through your sub or just low pass running through your 6x9's which won't be very effective...

  6. #16
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    MDF is much denser of a material making it preferable for speaker box construction as the sound is less likely to “leak” out of the enclosure.
    It is also a more stable material, not prone to shrinkage/ expansion and is perfectly flat.
    You want to ensure you pre drill all holes into the ends of the material to prevent splitting of the board. Use a quality wood glue on all joints
    For mounting of the subwoofer itself, use “T-Nuts” and bolts to allow the speaker to be taken in and out as many times as needed, screwing into the MDF will only hold up for one or two installations

  7. #17
    Voodoo 1 Ghost Rider's Avatar
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    Quote Originally Posted by Gabe View Post
    MDF is much denser of a material making it preferable for speaker box construction as the sound is less likely to “leak” out of the enclosure.
    It is also a more stable material, not prone to shrinkage/ expansion and is perfectly flat.
    You want to ensure you pre drill all holes into the ends of the material to prevent splitting of the board. Use a quality wood glue on all joints
    For mounting of the subwoofer itself, use “T-Nuts” and bolts to allow the speaker to be taken in and out as many times as needed, screwing into the MDF will only hold up for one or two installations
    Unless it gets wet...then you can watch expand... expand... and expand some more! LOL

  8. #18
    SlipperyVic
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    You can use that 4 channel Alpine in a 3 way setup. It has the cross over abilities to make that happen. It's going to be light on the power for both the 6x9's and the sub, but it will work. Might as well give it a go and see how you like it. I've got a Alpine Mrv-f300 which is the slightly bigger brother to that amp collecting dust on a shelf may work a little better for you.

    MDF is used for boxes because it's cheap, sturdy and easy to work with. For high end light weight boxes people use furniture grade Baltic Birch plywood but it's like 3x the cost of MDF.

    Box design is looking good. Can't wait to watch it take shape.

  9. #19
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    Quote Originally Posted by Ghost Rider View Post
    Unless it gets wet...then you can watch expand... expand... and expand some more! LOL
    fair point

  10. #20
    Club Supporter Frankie's Avatar
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    I've had a couple of those Alpine amps over the years, really good performers.

    If you've got the line level input plug, should be a nice easy clean install.

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