For rebuild, go to post #39. Initial four 15's build is below.
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Hey all. I've been reading these forums for years now, just trying to soak up some information before jumping in.
I've always had some sort of setup in my car ever since I got my first one at 16. However, it was always whatever I could find on Craigslist for under $200.
So after reading hundreds (if not thousands) of build logs, I decided to finally throw a little build together and see how it works out.
Next week I have fall break and will be doing a big overhaul. This system was put together in a little over 2 days, so I could go "compete" in my first show.
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Vehicle: 1999 S-10 Blazer 4DR
Head Unit: JVC KD-A605
Dash Speakers: 2x Pioneer TSG4645R 4" x 6" (30w rms)
Door Speakers: 4x Kenwood KFC-1665S 6.5" (30w rms)
Highs/mid amp: Hifonics Brutus 316.4
Subwoofer amp: Hifonics Brutus BRX3016.1D
Subwoofers: 4x NVX VCW 152 (15", dual 2 ohm, 1000w RMS) wired to 1 ohm
1 run of 4 GA scraps (acquired in trades over the years), stock battery, stock 105A alternator, no big 3 upgrade.
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![TxDJq8ll.jpg]()
![vb6VRNKl.jpg]()
I got these four 15s off of Craigslist real cheap, but they were in a box made for a tahoe, so I couldn't use them without removing/folding down my rear seats:
![qTU0954l.jpg]()
I did some research here, and found the build logs of members Carnag3 and SoCaLBaMF, who both did two 18"s in the back with rear seats. Their boxes were about the right size for my subwoofers, so I just needed to make some little adjustments.
Their builds can be seen here:
Carnag3
SoCaLBaMF
After learning how to use Sketchup, and playing around with some stuff, I got a design I liked:
![OETwhYul.png]()
![UW1Fy3Il.png]()
(The cutouts in the design represent the outer surround dimensions. The actual woofer cut outs are a bit smaller, but I mapped it out as such to make sure none of the surrounds would overlap.)
The planned specs were:
44.25" wide x 24" tall x 31.25" deep (exterior dimensions)
Port dimensions - 6.5" wide x 27" long x 21.5" deep (175.5 square inches of port area) (tuned to 34hz)
16 cu ft. gross
- 0.10 cu ft. for the wheel well wedges (3.875" wide x 29.75" deep x 7" long)
- 0.60 cu ft. for subwoofer displacement
- 0.11 cu ft. for 2" x 4" bracing
- 1.85 cu ft. for port displacement
13.44 cu ft. net (3.36 cu ft. per subwoofer, quite a bit over recommended specs by NVX).
(If someone is bored and would like to check my math for fun, that'd be cool. I'm fairly certain I have some sort of math error, as it was my first time trying to build a box.)
Cut-out dimensions:
44.25" x 31.25" x1 (top)
38" x 29.75" x1 (bottom)
44.25" x 22.5" x2 (front/back)
7" x 29.75" x2 (side stubs)
3.875" x 29.75" x2 (side stubs)
14" x 29.75" x2 (side stubs)
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I went and grabbed 3 sheets of .75" MDF, a gallon of Titebond II, a nail gun and some nails, and got started with the help of my father.
Mapping the top baffle out to make sure it would fit:
![tNRWvGZl.jpg]()
(The short lines were my original drawing with the top baffle being only 29.75" deep. I had to re-adjust it to 31.75" deep to make it all fit)
Start of the shell:
![SjLd2Dtl.jpg]()
Got the port up and installed. It acts as bracing for itself, with the four square legs:
![hjy1LVFl.jpg]()
2" x 4" bracing in between each set of subs:
![2GiML4Nl.jpg]()
All put together and subs loaded:
![TS6kK1fl.jpg]()
Sitting pretty in the back:
![QTloK6Cl.jpg]()
My temporary wiring mess:
![UXnPXhml.jpg]()
Seats in, with headrests, and still plenty of amp clearance and room to operate the folding mechanism:
![iqFwGGql.jpg]()
It was a lot of fun building the box, and despite some issues (TONS of crooked cuts, learnings curve on tools I'd never used before, screw gun getting jammed repeatedly, etc) I think it came out pretty good.
Some videos will follow below.
First hair trick attempt:
Interior flex:
Exterior flex:
First competition run:
At my first local "competition" (it was more of a get together, that happened to have a guy doing metering), I got the opportunity to try metering for the first time.
I hadn't done any previous research on how to meter, so I just drove up and asked him what to do. He put it on the dash, and told me to pick a song and play it for 60 seconds.
I used "On My Level (28 and up)" from Decaf Zip 19.
Got a 138.70 after 60 seconds, and took 4th place (no wall + 60 second musical average). I feel like that number was pretty low (for some reason I was expecting 144+), but my voltage was also between 10v - 11v for pretty much the entire run.
I think if I had played a different song I could've taken 2nd place. (It was 139.96 dB).
The guy who took first was in a Yukon with two DD915's on a Sundown SCV6k doing close to 149.
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I've since placed orders for a 270A JS Ultimate alternator, 60' of Copper 2/0 welding cable, fuses, fuseholders, etc.
Hopefully it'll arrive before this weekend, so I can pull out the whole system and start over.
The plan is for a 4th order wall (slide in) with a 2:1 ratio tuned at around 47hz.
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