This weekend i finished building a custom sub-woofer box for the back of my blazer. Here's what i got!

Making out the shape


Starting to come together.. with a whole cut out for the wheel well.


Fiber glassing a mold to form over the wheel well


Box is now wrapped, and there's the mold..


And here is the finished product!I had to take off the ring on the outside of the right sub, it was rattling around.



And a better look at the custom mold, its not perfect but it'll do.

 

looks very nice! Are those the KFC-W3012's? and what kind of amp?

I have a single KFC-W3011 and man that thing hits hard. Shakes my whole truck with my 600 watt JBL powering it.

 

One is a KFC-W2513PS and the other is a KFC-W2512. Made a mistake when ordering them and got two slightly different ones. The amp is a PhoenixGold XS2500. (Kinda old school)

My old set-up would hit hard with just the KFC-W2512 and a jensen power 400 amp but this set-up is just insane.

 

yeah, looks good man.
well done.

 

Nice! What is the rest of your audio setup?

 

Sweet

 

props man looks clean well done!

 

That's a sweet box. You have some bass, yet you still gain a lot of cargo area. A+ on creativity and an A+ for practicality.

 

What size box should I choose for a 12-inch subwoofer? I want to make some unique custom boxes to attract people.

 

I dug up this article for you:

"Speaker Enclosures are more than just wood pieces randomly thrown together and screwing speakers into them. The volume and port size and length (if you go ported, which I HIGHLY recommend) is determined by some basic arithmetic involving some of the speakers' specifications, and your taste.

The following table gives an approximate volume in cubic feet you need to plan your enclosure for based on the woofer size. The woofer is the single most important element in calculating your enclosure as it makes 80% of the air or more.

Woofer Size --- Enclosure Volume
4" ======== .25 - .39 cubic feet
6" ======== .35 - .54 cubic feet
8" ======== .54 - .96 cubic feet
10" ======= .96 - 1.8 cubic feet
12" ======= 1.8 - 3.5 cubic feet
15" ======= 3.5 - 8 cubic feet

How you distribute that volume is pretty much up to your needs, just don't make them square! Square enclosures will make awful bouncing frequencies. You might have noticed that many sound reinforcement speakers have the sides of the box tapered in toward the back, if you can do that, do it. that helps sound move out and not bounce like it does between parallel surfaces.

To figure your enclosure size in inches, multiply all the sides as follows height x width x depth, so if your box is 16" x 12" x 8", you have 1536 cubic inches. Take that figure and divide it by 12 three times, so 1536/12/12/12=.89, so, your enclosure is .89 cubic feet.

Easy, huh?

OK, that is the rough volume, to get a more precise figure for the volume of your enclosure you will need two numbers from the specifications of your woofer. The Q (or, Qts) and the V(as) ratings. The V(as) is usually measured in Cubic feet, but some companies use liters, if this is your case, divide liters by 28.32 to get the cubic feet.

To get the volume, compare your Q rating to the chart below, take the multiplier listed for your Q, and multiply that by the V(as), and that will be the optimum volume of your enclosure in cubic feet.

Q ---- Multiplier
.2 ==== .1
.25 === .25
.3 ==== .4
.35 === .75
.4 ==== 1.1
.45 === 1.5
.5 ==== 2.0
.55 === 2.6
.6 ==== 3.5

And there ya go, the exact optimum volume for your speaker enclosure, so just figure out how to best size the enclosure, given your volume, to fit your needs."