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It is my great pleasure to introduce to you...

5855 Views 42 Replies 16 Participants Last post by  samo new stereo install :D . Since 1CLNB14 called my old setup "ghetto" (which it was...) and the box was absolutely massive and took up half my trunk (1.25 cubic feet for a 10"... what was I thinking?), I decided to re-do it about a week ago, with four goals in mind.

1. The box had to put audio quality first. I designed parameters for the box dimensions and built the rest of the system around the sub box.
2. The box had to look relatively factory. Going with my goal with the Sentra to be my interpretation of what the stock Sentra should have been, the box had to blend in well with the factory decor. This meant no crazy fiberglass, no weird colors, and no Plexiglas windows, etc.
3. The box had to take up a minimum of space. My car is a daily driver and needs its trunk. Floor-mounted subs and amps are a no-no.
4. The box had to leave the spare tire in place and fully accessible without removing the box. Since my car sees around 200+ miles of freeway driving a week, the spare tire was a must.

With these goals in mind, I designed the box. I settled on an interior volume of .72 cubic feet, including the displacement of the sub. Unfortunately, this was a little small for the sub (recommended volume is .80 cubic feet, not a huge difference), so I decided to use the 1.5 lbs of Polyfil from my old box in the new one. I decided on .75" MDF from the local hardware store, which cost me $23.35 for a 4x8 sheet, plenty for what I was doing. Unfortunately, my first bit of cutting didn't turn out so well. The angle markings on the saw were not very accurate, and my beautiful 45-degree miter joints turned out to be 50-degree, enough that all the panels had to be scrapped, along with the idea of using miter joints. I recut the panels and attached the new ones using a thick layer of Elmer's white glue and 2"x8 self-tapping flat-head screws, countersunk into the wood. Once all six panels were in place, I layered on an 1/8"-thick layer of Bondo on the inside to seal the box. This ultra-messy stuff has a horrid smell, and I highly recommend good ventilation when working with it. I'm sure I'm about 500 brain-cells short now.
The amp mount was a little trickier. I wanted to be able to see the amp and I wanted plenty of air to get to the amp, so hiding it was out of the question. However, going with the stock look, I didn't want to be able to see the mounting screws or any wires. Mounting it through a cutout from the back seemed like an interesting option. I cut a panel that extended off the side of the box and cut a hole for the amp to mount through. I also chiseled away the back side of this panel to provide room for the wires. The amp was mounted through this panel so the heatsink faced the same direction as the sub and all the wires, controls, and mounting screws were completely hidden behind the panel.
To make the box and amp mount look a little more factory, I make a panel to mount on the top that fit the contour of the wheelwell and all the junk in the trunk of the car. Using a piece of aluminum foil and a piece of cardboard, I made a template and cut it out, filing it down to fit. This was mounted to the top of the box with 1.5"x8 screws, countersunk of course.
The floor of the trunk also had to be redone, since the old floor was a cheap piece of chipboard that was sagging from two years of various heavy guitar junk in the back. Using the same MDF, I cut out a new three-piece trunk floor, one piece for the back of the trunk, one for the right side under the box, and one for over the spare tire. These panels were connected to each other using short wooden dowels that are drilled into one panel, and a cut-out to fit the dowel in the corresponding panel. This keeps the trunk floor totally flush and is strong enough to support upwards of 100lbs in the trunk. Any more than that will require removal of the floor, which is amazingly easy thanks to this dowel-system.
Keeping with the stock look, I chose a dark grey fleece as the material for the trunk floor. This fleece is very stretchy, making it easy to carpet, very soft, and is a beautiful charcoal grey color. It's also surprisingly strong and very difficult to cut with an Exacto knife :) . Using Elmer's Spray Adhesive, I attached to to the faces and exposed sides of all the panels. The bottom of each panel is uncarpeted since you can't see it and to save material. I also chose to carpet the sides of the trunk to match. This material proved very easy to work with and made beautifuly smooth creases on every panel.
The sub was installed using 1.5"x8 screws and the box was filled with 1.5lbs of Polyfil to help make up a little for the small volume. Wiring is done through a sealed terminal cup.
The sub is a Panasonic EAK-WG25. It's a 10" sub designed for 120w RMS and 450w peak, with a sensitivity of 90dB/W/m and a 44.9 oz magnet. The amplifier is a Kenwood KAC-428S that puts out 100w RMS and 200w peak in bridged mode. Wiring is using Monster Cable 4-gauge power and ground wire and Monster Cable C-5M RCAs. The sub recieves power through 16-gauge standard speaker wire.
Some final adjustments still have to be made to certain panels to make the fleece hold a little better, but this is what the finished product looks like. What do you think?

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nice install!!!!!:D i was thinking of doing the same thing for my 200sx only on both sides with four tens and an amp rack in the middle. man it looks really good though id be showing that baby off!!! hows it sound? just wondering, i have an audio compition to go to on the 24th of aug. and want my install looking as sweet as yours. thats if i have your permission to copy your design a little?;)
thanks i may need it! I need allot of work done yet. my trunk right now looks like a rats nest of speakers amps and wire!!! it sounds really good, from what i've been told, but i dont want people checking out my system and say what a mess. although out here in this flat place they call the great plains i havent heard too many people that can out perform my sound quality but there is some pretty big sponsers supporting this so i dont know how far people are going to be coming here for it. man back home on the east side i wouldnt even be thinking of competing!!!:)
samo said:
By the way, I think you're going to have a difficult time mounting four 10"s on the side like that. The box would have to stick out easily another 10" from where mine is. You could make two fit, one on either side, really easily (build mirror-image boxes, basically), but I'm doubting that four would fit. It's worth a shot, though. Be sure to post pics when you're done!
Will do Samo! A friend of mine is really good with carpentry work and he wants to help. he said it would be hard too:( . but has a plan to put them on angles so he can make the proper box size. I'll lose allot more trunk space this way but from what he's saying it'll look pretty good.
i was thinking the two twards the front would be at a angle and the two at the rear would face each other. my speakers recommended box size is .75 cu feet so i think i can work this out. there made for a smaller enclosure.
i talked to my local dealer to make sure and i was right when the speakers face each other the air compresses and when the bass drops it drops! (kind of like a band pass) im still working on this box, im in the design fase right now and so far so good. im having trouble with the cubic feet this is stuff i havent done sense i was in high school!!:( because of the way the 200sx's trunk is shaped this is proving difficult. my 91 would have been much easier! man i miss that car.
infrared said:
Hey landlord , if you havent started yet I got a suggestion for ya .Four 10" will eat up all of you truck space . Why not try 2 dual voice coil speakers . It would give give you almost the same output but from 2 speakers, plus you'll save some money and space.

i already own two tens, i am going to buy two more and two 1000 watt clarion amps. i figure with four tens ill have room for the two clarion amps and the cheap chunch usa amp for my mids (wich will be replaced next month after i get my header and cia). construction should start next week on the box although, i have not decided where to put the capacators (2 farite) and the wiring yet, ill figuer it out when i get there. where almost done with the designs (we where delayed because my carpender friend did not understand that this HAS to be easily removable for when i got to the strip, so his first ideas and drawings (he had it all planned out perfect!) had to be scraped :mad: . so its taking awile to get it right on paper so we dont have any trouble building it. the trunk space means nothing to me! money is no object im out to win a trophy!
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LexKyB13 said:
money is no object? must be nice...:)
well i work my ass off for it, two full time jobs, i work 7 days a week, plus i need time to work on my car, let alone ,eat, shit, sleep, and shower. but when i set goals i want them now!;) im not rich just motivated, hell i make quite a bit bettween the two, i live with two other people to cut down on rent, and im still broke as hell!!! but hey if you want something such as an expensive hobby like car audio and performance you have to make sacrifices.
LexKyB13 said:
sorry bro, i didn't know that your life, 2 jobs, ALL THE DAMN TIME...and all was the same as mine, but i don't make shit between the two, and it all goes to child support, house payment, insurance, etc...anyway, sorry about that, i was in a pissy mood...some 16 yr old punk was driving MY silver '03 M5 today....what does he know about that kind of driving machine?!?:D
i didnt take offense at all;) , i just wanted to let you know that im not a rich boy throwing "money is no object" in everyones face (i really hate better off than me people like that). no need to appologize:D i didnt think you where being pissy at all, you kinda pointed out the "money is no object" to me (which makes me sound rich or still living with mommy and daddy) and i had to explain myself so really i should be thanking you:D . and i understand your situation my one roommate has 2 jobs and he's living with us cause he has to! his ex is fuck'n him over tough on child support!
boxes are done!!!! very little room in my trunk:D still needs carpet and hooked up but the hard parts done!!!! Yeaaaaahh!!
cant wait to hear what the 4 10"n's are going to sound like!
hey look newbie status be damned!!!
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