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Thread: subs/amps/boxes questions

  1. #1
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    subs/amps/boxes questions

    ive been considering making a custom fiberglass box for my car, but i have some questions that would influence how i make it.

    first, ive seen some sub boxes with padding or something in it. is this
    necessary? and do you need to factor in the space that it takes up into the airspace, or not?

    second, ive read that jl subs need at least 1 inch of space behind the deepest point of the sub, is it more or less for most other subs?

    lastly, when mounting an amp, does it need to be open air so that it doesnt overheat, or can it be tucked away somewhere?

    cheers!

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    You are aware that this is a forum devoted to vehicle computers, right?
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
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    oh, i wasnt aware that it was just for carputers. i thought it was all car audio.

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    that's why you should first
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    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by IC-C30 View Post
    that's why you should first
    That's why we need one of those questions on new user registration...

    "What is this site about?"
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  6. #6
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    Quote Originally Posted by 2k1Toaster View Post
    That's why we need one of those questions on new user registration...

    "What is this site about?"
    Multiple choice:
    A. General Car Audio
    B. The complexities of integrating a computer into the car

    If you answered (A):
    "You have been denied membership"
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  7. #7
    Wants to make it harder monkeyracer's Avatar
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    I understand why he came here though, the site says mp3car.com, not carputer.com, and it has a fabrication forum. If you search for fiberglass box techniques, it's likely he stumbled upon this site. Who knows, he might even look through these pages more and start to want to put a computer in the car. This is why I am here, I started for help on using my ipod with my existing pioneer deck, stumbled upon here, and now I'm stricken, I'm putting the puter in. Maybe this will happen to him. Regardless, I have a walkthrough of the box I'm working on:

    http://www.mp3car.com/vbulletin/fabr...lkthrough.html

    Still in the fab phase when I have the time to actually do it though, keep checking soon, it should help any noob on fiberglass in general and specifically for sub boxes.

    Today's lesson: Don't knock a n00b too hard, they might actually want to be a constructive part to this community.
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  8. #8
    Newbie Gator454's Avatar
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    Quote Originally Posted by 4Ring_Jelly View Post
    ive been considering making a custom fiberglass box for my car, but i have some questions that would influence how i make it.

    first, ive seen some sub boxes with padding or something in it. is this
    necessary? and do you need to factor in the space that it takes up into the airspace, or not?
    No it is not necessary unless your box is undersized for the driver. Yes you have to factor in the volume of the fill, but it adds to box volume not subtracts.

    second, ive read that jl subs need at least 1 inch of space behind the deepest point of the sub, is it more or less for most other subs?
    Most sub drivers vent the voice coil out the back and the air space is so it won't overheat, and yes more or less most subs.

    lastly, when mounting an amp, does it need to be open air so that it doesnt overheat, or can it be tucked away somewhere?
    It gets hot, and amps have heat sinks to dissipate the heat. If it's tucked away you will have to ventilate it.

    cheers!
    Cheers! from one noob to another.

  9. #9
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    Quote Originally Posted by Gator454 View Post
    Cheers! from one noob to another.
    Thanks! very helpful!
    and I wouldnt have guessed that the padding increases the volume!

  10. #10
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    Quote Originally Posted by Gator454 View Post
    No it is not necessary unless your box is undersized for the driver. Yes you have to factor in the volume of the fill, but it adds to box volume not subtracts.
    It depends on the material used. Some material can take up space, other will make it seem larger than it is.

    Poly-fill is good for this as is some Black Hole product out there. It's not a general statement. It's not a deffinitive "put padding in and you'll get more air space". There's a fine line and it varies depending on the material used.


    It gets hot, and amps have heat sinks to dissipate the heat. If it's tucked away you will have to ventilate it.
    In general, yes, this is correct. However, if you buy an amp that's oversized for your speakers, one that's efficient, has a lot of overhead, and is a GOOD amp, you can get away with tucking it away more than others.
    Jan Bennett
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