Want to fiberglass nearly the ENTIRE trunk, but have some concerns.

bikinpunk
10+ year member

G-g-g-g-g-unity!
Since building my false floor (below) my total floor height has been raised about 3.5". In doing so, my sub-box is now hitting the top of the car, not allowing it to go back as far as it once did.

trunk.jpg


First off let me clear this up nomenclature: The "front" of the trunk=end of the car, brake lights, trunk latch area. The "back" of the trunk=rear seat.

Now, I thought I would fiberglass the entire back wall (rear seat area), and side walls to get a very solid mold and use 1" MDF for the face and ultimately sqeeze as much airspace as I can out of my enclosure. I want to go ported, however and tune very low. If I do this I have three concerns:

1. Getting pressure into the cabin. The trunk would nearly be completely sealed off if I go for a complete rear trunk mold. In this case, I wonder if I would be better off firing toward the cabin (seats still up, though). This would be cool because the sub would not be visible, however, I just don't know about this. Would I HAVE to COMPLETELY seal off everything from the sub box toward the cabin of the trunk to gain optimal output?

3. The top of the trunk. It has ALL sorts of stuff up there (rods, weird stuff). If possible I'd like to get that molded with 'glass/fleece and position it about 1/2" lower for clearance. A sheet of wood won't work since as soon as it hits the sides the trunk makes a weird bowed shape again (like most trunks). I suppose I could use a portion of MDF for the flat portion, and then 'glass the adjoining portion? How hard is it to fiberglass on a vertical surface? I would imagine this would KILL my back.

2. Port Placement. Since I'm trying to conserve as much space as I can, I don't believe I'd have enough room for the port to be positioned in the direction the sub is facing (depth of box). In my current aero-port setup this is not possible since the port is 20" long, 4" diameter. The depth of the box is only 13". So, two things fall here and one is linked to my first question: A) Face the port out the side of the box, but the box is touching both sides of the wall and the port would fire right into the side of the car...I mean, FLUSH. B) Face the port up, but still don't have much room. Will a larger diameter port allow me to go with a shorter length?

I'm looking for suggestions, or even pictures if you had the same issue. I think my depth would be ABOUT 14-15".

*wish I had Bass Box Pro on my computer @ work*

 
you do know that you are going to have to work entirely inside the trunk. and in a civic, that is going to be pretty tough. and your car will smell like resin for months :p

 
i wouldn't fire the port right into the wall. having it up would be better.

and i believe it's the opposite, bigger diameter port = longer port length to achieve the same tuning.

 
and i believe it's the opposite, bigger diameter port = longer port length to achieve the same tuning.
Yea, I'm pretty sure that's correct. Follows the same principle as adding a 2nd port requires more length.

 
this is gonna be a really expensive box
Yea...my only option is to take up a lot of space in my trunk or get a 10". When I bought this sub I had an SUV so I wasn't worried about space. //content.invisioncic.com/y282845/emoticons/mad.gif.c18f003ab0ef8a0d9c27ca78d77a6392.gif

 
Why not run some infinite baffle subwoofers? Lets u have ur trunk space and still have low subs that can still get pretty loud.
I'll look into it, because I don't much about that type of enclosure, but if I remember correctly it requires the trunk be COMPLETELY sealed from the front baffle. Plus, I'm not sure how my sub would act in this type setup. I don't think I'm willing to take on that task...seems like it would be HORRIBLE. But, it is a good idea, even if it doesn't work for me. Thanks for the thought.

 
couldn't you put a bend in the port inside the box to achieve the length. Use an elbow joint to connect two pieces of the port
Not sure if I'd still have enough room. Elbows are usually fairly large and take up some room themselves, but I'll look into it. If this will work, I can have the port firing at the front or rear, so it's definately worth looking into. It just seems like I had heard bad things about using elbow joints for port due to more port noise. I'll search on it, thanks.

 
one concern i have

i thought that perfectly flat areas of fiberglass made it weaker

in other words.. most of the parts youll be doin are flat and idk about that

but hey i never did glass.. and youve probably been researching like crazy lol

 
Activity
No one is currently typing a reply...
Old Thread: Please note, there have been no replies in this thread for over 3 years!
Content in this thread may no longer be relevant.
Perhaps it would be better to start a new thread instead.

About this thread

bikinpunk

10+ year member
G-g-g-g-g-unity!
Thread starter
bikinpunk
Joined
Location
Alabama
Start date
Participants
Who Replied
Replies
14
Views
1,010
Last reply date
Last reply from
bikinpunk
IMG_20260516_193114554_HDR.jpg

sherbanater

    May 16, 2026
  • 0
  • 0
IMG_20260516_192955471_HDR.jpg

sherbanater

    May 16, 2026
  • 0
  • 0

New threads

Top