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Thread: Subwoofer box design in my Fiero

  1. #1
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    Subwoofer box design in my Fiero

    Hey everyone, with my Christmas money I've decided to finally get some low end in my 1985 Pontiac Fiero, My Dad and I have already added a cd changer (put it in the front) and an aux input for an iPod (two relays/switch, fifty problems)


    Anyways. We decided to do what some people do and put the sub woofer into the center console, what we plan on doing is extending were the current only place for storage is and reupholstering it, and putting a sub woofer box inside of the new space, this way the sub would be unseen.



    Here is an example of mounting it on the outside but, since we like the factory look we plan on doing what they have done but mount the sub woofer in a box inside of it and then allowing the sound to come out of the vents that are on the sides of the console already to let the computer breathe.


    So for the woofer I've picked a Rockford Fosgate Punch Stage 1, and for amp a Profile AP400. The woofer's recommended volume of a cabinet is 0.25 cubic feet so I figured this should work for us:


    (those dimensions would be slightly larger since they are for the inside of the cabinet, but that's not too important)

    This would give us slightly under 0.25 cubic feet,


    After all this detail, what I need to know is, will these dimensions be just fine and does this box need baffling?


    -jeffrey

  2. #2
    FLAC
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    That box is super tiny. That woofer needs a lot more airspace than that to work. Have you looked at any other small enclosure subwoofers? There was a decently sized thread on this subject a few weeks ago, check that out.

  3. #3
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    Quote Originally Posted by Shadow View Post
    That box is super tiny. That woofer needs a lot more airspace than that to work. Have you looked at any other small enclosure subwoofers? There was a decently sized thread on this subject a few weeks ago, check that out.
    Alright, though if I calculated right it has the 0.25 cubic feet that it recommends (range is .15 to .35)

    Will R-13 insulation be fine to stick into the box instead of the normal box stuffing? We've got a big roll from when we did our studio laying around and it'd be nice to not have to buy something else.

    At the moment we are debating on what solution to do for the subwoofer, right now we are considering building the cabinet to integrate with the firewall (it's a double firewall) behind the passenger, or if we should buy a premade center console since I don't know if we have the fiberglass skills to do craft our own.


    -jeffrey

  4. #4
    Maximum Bitrate boomintrac's Avatar
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    this is for the 8" woofer? You might need to rer configure your enclosure, as that woofer is 4" deep. were the measurements for the external or internal volume? what size wood will be used for the enclosure. Another option would be to try and use the rear package tray since there isnt much use for the rear window anyway, should also allow for more room for a bigger enclosure. Just an alternate idea for you to kick around. good luck with it and dont forget pics.
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    Just go buy a bag of polyfill. Shouldn't cost more than $5.

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    I've seen the rear window filled with subbox, it looks intimidating, but I'm thinking you'd miss the rear view. I'm not a big fan of the centre console box, as you'll always be banging your elbow on it. Putting it behind the seat is very complicated, if you're contemplating cutting the forward part of the firewall. You only get an extra inch or two by doing all that cutting, and you risk cutting through the back firewall.

    I'd stick with the passenger side footwell. You can build a small enclosure that sits right up in the footwell, and is barely noticed. I've just got a small premade box pushed into the well and it barely takes up any space. My wife hasn't really complained much.

    There's lots and lots of sub box pics on Pennock's forum. Go to www.fiero.nl and search for sub box. You better have a good day or two to waste.

    Good luck with it.

    Kris
    '87 GT
    How Much Horsepower Can I have And Still Go To Heaven?

  7. #7
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    Quote Originally Posted by Superduck View Post
    I've seen the rear window filled with subbox, it looks intimidating, but I'm thinking you'd miss the rear view. I'm not a big fan of the centre console box, as you'll always be banging your elbow on it. Putting it behind the seat is very complicated, if you're contemplating cutting the forward part of the firewall. You only get an extra inch or two by doing all that cutting, and you risk cutting through the back firewall.

    I'd stick with the passenger side footwell. You can build a small enclosure that sits right up in the footwell, and is barely noticed. I've just got a small premade box pushed into the well and it barely takes up any space. My wife hasn't really complained much.
    Kris
    '87 GT
    Thanks for the comments, I should have checked this before but it's all installed, and it is in the passenger footwell.

    Our problem with the console was that we need the arm room, and we couldn't do behind the seats because we are decent sized (6'1/6'2) and need the room,

    We took off the entire dash (and a few unnecessary things) and mounted it in the spot for (i think) the factory sub woofer, it has NO BOX, thats right, it's open to the world. We packed around it with fiberglass and I could not wish for it to sound better, my ears hurt after coming out of it, the levels may need some tweaking but we get no audible distortion when the sub woofer is too loud for the music.

    At one point (today) as we started to install the dash, we plugged in both of the speakers and it started to act strange, the radio had this thump on/off at a steady rate, we cut off the sub woofer's speaker to line level converter, unplugged the CD changer and everything, we put our meter on everything we could. I already decided I had to buy a new head unit (and I didn't want to, We have made a lot of modification to the current one and I love the factory look) untill, an hour into this problem, my Dad noticed the dome lights seemed dimmed. Plugged in the charger/reconnected everything, Wallah. The radio wasn't getting the voltage it needed.

    Anyways, it's in and it sounds fantastic so take some pictures:

    The amp's still not installed, but that'll be next weekend.


    I can never look at this car the same after seeing it so naked (well I've seen it without an engine, but still, it's shocking)


    Here it is, two metal brackets, both with rubber on them to isolate the speaker from the car (we had it without them and the car vibrated/shook to such a horrible extent), and one (with rubber as well) from the duct to the speaker, surprisingly it is very strong even with just three brackets holding it in and yes, it sounds great without a box.


    Here you can see the switch to turn the radio into auxiliary mode (it kicks off two relays mounted inside of the radio to switch the input source), and the cd changer control (we haven't decided if it's staying in its current spot)


    And thats it.



    -jeffrey

  8. #8
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    That sub's not meant to be freeair, it may die soon. Who knows, it might have enough pressure resistance to where it'll be okay.

  9. #9
    Newbie MRVJ245's Avatar
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    thats if his Battery doesnt die first if his alternator cannot keep up
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  10. #10
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    Quote Originally Posted by MRVJ245 View Post
    thats if his Battery doesnt die first if his alternator cannot keep up
    It's a tractor battery used for testing, wouldn't make much sense to have my car's battery on a chair would it?


    Why would my subwoofer die? I could see it not getting enough resistance and moving to much, and at a certain volume it does and I can hear it, but that volume is useless/annoying.

    Anyways today we mounted the amp on the driver side front fender, everything looked great, it had plenty of clearance with the hood, tested it fine, then I did a little bit of cable management and the wires seemed invisible, until we closed the hood and the arm that keeps it up smashed one of the RCA connectors. Didn't see that coming. So once we find a mount for it that will actually work, I'll post a picture or two.


    -jeffrey

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