Benefits: Free/low cost, easy, improves sound quality, weighs little.

Here is my attempt to make some low-cost, efficient rear speaker enclosures for my CRX. Just in case you were wondering no expense was spared for this project. Nasa-grade engineering begins immediately with the free duct tape and cardboard resourced from the garbage. Now, I know what you're thinking...but if you do a good job you will end up with a relatively large enclosure that is ready to lay down some dynamat. These layers are surprisingly strong and function really well. The benefits are a deeper mid mass punch that was not there previously. FUNCTION over FORM. For me, everything was free and I have had fun reaping the benefits.

Anyways... here was the idea that looked and probably sounds good but costs anywhere from 100$ to 200$ if you can find them.



then i noticed how easy it would be to use the surrounding paneling as walls, and all I had to do was make a back wall and seal everything off.



Here is the fist layer. Just with this alone, it already sounds much better, making it airtight and everything air tight and with a few layers in key areas, it is very tight and strong with and improved sound. Next I used a layer of dynamat thanks to some helpful advice. The polyfill is used to make the enclosure even bigger. I used some foam weatherstripping to seal misc edges etc.

After I finished the first one, I listened to the other side for comparison and I was very pleased.




Updated 8-2011

I decided to test fit some 6x9 speakers back there recently and I discovered they could fit with very little modification. I grinded down a small area of plastic and installed some 6x9 speakers in the rear of my CRX. Sound is great and just wanted to share.

Dynamat enclosure with polyfill



Area I had to grind down



Grilles still fit fine

 

Very nice, in my car i think there 6.5" speakers very ghetto setup right now. there held in with drywall screws(done by 2owners back). I like the idea of making it a sealed enclosure

 

I like your idea.
Try something like Dynamat (http://www.dynamat.com) to get an even better effect from it

 

Beware of the little foam bowls sold for $20 at car audio places. They looked nice, but they are too small and killed my sound quality. I'd say they were 1/3 to 1/2 the air volume of what is being made here. Good separation, but loss in mid-bass.

nice writeup!

 

I did something similar but less ghetto. I took a wall-mart bag, taped it to the speaker mounting bracket (with everything still installed in the car), filled the bag with window insulation foam, and let it dry. Once it's dry you have a custom molded speaker enclosure or at least the shape of it. Then just fiber glass over it, take the old foam and wall-mart bag out of the fiber glass box once it's dry, mount it to the speaker bracket and instant speaker box

 

I would love to see some pics of your setup. I really wanted to shove some 6x9 speakers in there, I know people have done it. 6x9 speakers with an enclosure would be nice.

 

I'll see if I can get some today or tomorrow. I stripped the rear interior to look for a water leak and left them in my storage.

 

nice i did almost the same thing with dynamat pretty easy and it makes a big difference with midbass focus another thing you can do is fill the " enclosure " with dacron ( acrylic pillow stuffing ) to make the driver "think" it is in a bigger enclosure

 

UPDATE:

So I followed Dopey88's advice and added dynamat to the rest of the enclosure and filled it with polyfill stuffing. It made a really big difference and just wanted to say thanks!