I have a ported box trunk of my little 94' sunbird. When I turn my head-unit up barely any, to just get a little thump out of my sub, the box throws so much air that everything in the trunk rattles like crazy. The main problem is the little shelf in the very back of the car, right underneath the rear windsield, inside it would be the roof of the trunk right after the trunk lid, you know what I'm talking about. Well, the cary is kinda made sorta cheaply, so that shelf part isn't very thick, or selaed tightly for that matter. It vibrates up and down obnoxiously, and makes a hell of a racket. I was thinking about cutting a sorta "port", or just a circle into it, so air in the trunk could escape into the cabin of the car, and maybe relieve some of the pressure. I was also wondering if this would make things louder in the cabin, since my rear seats don't fold down, and the trunk is vertually sealed off.
The sunbird has 2 6x9's in the back. I had gotten new ones when I first got it before I got a system in the car, but now of course I don't use them. I could go inside and cout out the holes thouh. The holes for the 6x0's aren't open, but I think it's only a thin layer of the grey carpet-like stuff that's covering them. Thanks for the idea. Would those be suffecient sized holes for what I'm trying to do?
i have a similar problem in my 93 cavalier. My rear deck rattles like crazy and I've been looking for something to do about it. So how much will this actually take out of the sound of my system? (taking the speakers out) It actually adds SPL? And do I need to also cut away the carpet layer like Joe said he has?
Thanks for the article. Dustin, are cars are virtually the same thing, so I'll tell you what I do today, and how it worked. I don't think I want to take the 6x9's out, incase I ever sell the car and some crazy person wants them back in. So I'll trace a hole maybe the size of a coffee can into the deck right in the exact middle, and cut it out.
Hey Dustin, I finished putting my holes in the deck, and I have to say I am very very happy. I broke down and did end up taking the 6x9's out, and cutting out the holes for those. Of course a plain hole (not perfectly shaped due to crappy cutting skills) doesn't look very good, so I took 2 6x9 grill covers and positioned them over the holes evenly and screwed them into place. I was a little afraid that the air flowing through the holes in the grill would make a different noise, but suprisingly you don't hear anything. I couldn't tell a huge difference in the spl, yeah it was a noticibley a little louder, but the sq was so much better. It instantly got rid of the "muffled" sound of the bass, and you could hear different frequency's better. It also almost completely got rid of the deck rattle, since the air now has a place to go, and the inside of the car doesn't rattle nearly as much anymore.