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Old 12-02-2013, 05:01 PM   #1
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** Sub box build (4th order bandpass!) **

Well, I design and build boxes as a part time business and have been doing so for almost a decade now. Finally decided I wanted to put something in the jeep, but didn't want to put a whole lot of money into it, because after all, I am driving a vehicle with plastic windows...

I will have less than $150 in the entire system, which is the only reason I even considered having a system in the Jeep.

Equipment:

Sub: Funkin Audio SX10
Amp: Crunch P1-3050.1
Wire: 1/0 Knukonceptz

Box:
1.1 sealed
3.7 ported
8.25" Octaport (birch)
51.91 hz (sealed resonance)
Duplicolor bedliner with the port having 5 coats of polyurethane

Enjoy!!!







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Old 12-02-2013, 05:05 PM   #2
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I love 4th and 5th order boxes they produce lots of base for sure. Looks great wish I had the space to spare I am jealous.....

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Old 12-02-2013, 05:06 PM   #3
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I never use my backseat, and I got the sub for free, so I figured it was time to build a little system. Doubt many people would understand the need for such a big box for a single 10" sub.
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Old 12-02-2013, 05:17 PM   #4
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Yes but that 10 in sub will produce the base of 2 12 in subs. That is a great box.
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Old 12-02-2013, 05:46 PM   #5
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Excited to get this thing hooked up. Amp will be here Wednesday and wire will be here Thursday or Friday. I'll have to test which configuration is loudest, either having the port firing back or the port firing forward. Then once I figure that out I'll mount the amp to the front of the box, so when I want to take it out I just have to undo the wires from the distribution blocks and I can take the whole thing out as a unit.
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Old 12-02-2013, 05:52 PM   #6
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Sounds like a great setup. Anxious to hear how it turns out.
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Old 12-02-2013, 05:54 PM   #7
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I'll be posting a video of it when it's all installed and done.
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Old 12-03-2013, 01:30 AM   #8
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You can have the crappiest sub ever, pair it with a box with the right airspace and ported right and it will sound like a top of the line sub! But ya I agree, I wouldn't dump a lot of money into a system with plastic windows.
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Old 12-03-2013, 09:19 AM   #9
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The right box makes all the difference.

If anyone has a facebook go check out my page McGovney Designs.
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Old 12-06-2013, 11:56 AM   #10
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Had a little bit of fun this morning. Between yesterday afternoon and this morning I've helped 8 people who were stuck on hills and in ditches. Was even able to air up a guys tire to his disbelief (I have Onboard Air in the Jeep so I can air up tires/run air tools/blow my train horn).









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Old 12-06-2013, 03:42 PM   #11
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Nice looking jeep, what is the paint color called for that blue?
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Old 12-06-2013, 05:15 PM   #12
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Nice to see someone venture out and do a non sealed build, with non mainstream brands in a Jeep. I did a 1.78cuft.(after port and sub displacement) downfiring/driver side port box. Im running a Sundown E10d4v.3

Top on or off, the thing pounds. I imagine yours is going to be pretty bad ass. I needed to keep my rear seat, and my box already takes up most of the room. I wish I could have fit a 12" ssa gcon back there. Btw, do u ever post on diyma.com?
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Old 12-06-2013, 05:29 PM   #13
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Quote:
Originally Posted by Nlburden View Post
Nice looking jeep, what is the paint color called for that blue?
Intense Blue Pearl
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Old 12-06-2013, 05:32 PM   #14
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Quote:
Originally Posted by The_Dealer View Post
Nice to see someone venture out and do a non sealed build, with non mainstream brands in a Jeep. I did a 1.78cuft.(after port and sub displacement) downfiring/driver side port box. Im running a Sundown E10d4v.3

Top on or off, the thing pounds. I imagine yours is going to be pretty bad ass. I needed to keep my rear seat, and my box already takes up most of the room. I wish I could have fit a 12" ssa gcon back there. Btw, do u ever post on diyma.com?


Diyma.com is shutting down... im a member of ca.com, caco, smd, and SSA forum though. I starting running Fi in 2007 and havent gone "mainstream" since. Ive ran sundown, DD, Fi, Incriminator, and IAD/PAP. i bet that sundown of yours sounds very nice. I actually design and build custom enclosures. Check out my facebook page McGovney Designs.
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Old 12-07-2013, 08:19 AM   #15
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Box is in and secured. Now to just run the wires. I forward fired the box because theres nothing really for it to load off of firing back. And ive seen many spl vehicles work firing forward under the window.



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Old 12-08-2013, 08:03 AM   #16
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Quote:
Originally Posted by 99Dodge View Post
Diyma.com is shutting down... im a member of ca.com, caco, smd, and SSA forum though. I starting running Fi in 2007 and havent gone "mainstream" since. Ive ran sundown, DD, Fi, Incriminator, and IAD/PAP. i bet that sundown of yours sounds very nice. I actually design and build custom enclosures. Check out my facebook page McGovney Designs.
Yea, its definitely surprising. Tuned at 33ish hz, it gets low as well. I quit running mainstream brands a long time ago. I ran an re sx(the original, when they were us made), then upgraded to an adire audio Brahma. Btw, I wish I would have kept the Brahma. Ever since then, I realized there were alot better options out there that puts the big brands to shame. I've been wanting to try the Incriminator LI ever since coming across them. Funny because most people ask why I always run flea market brands lmao.

Your box looks good. Forward firing was a good idea. If you had a hard top, rear firing might would have been ok. I've found that in a Jeep, downfire when possible, and front fire if u cant
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Old 12-08-2013, 09:38 AM   #17
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Wired everything up real quick last night... It sounds like its over a 140, but everyone knows loudness doesnt always correlate to SPL. I am however getting metered tomorrow evening. Hoping to see that 140+...
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Old 12-08-2013, 10:07 AM   #18
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Damn. 140 would be pretty good in an open top jeep. Does you spl drop noticably when the doors are open? Mines louder on the passenger side for some reason. Prolly port placement. I originally want to downfire the sub and port, but just couldn't get the room a 4" port would need off the floor. If I had to guess I'd say mine is defiantly in the 130 area. Not bad considering the conservative amount of power im feeding it. Maybe one day I'll upgrade to a 10" gcon and hit it with a brx1100@1ohm. Most guys dont realize how loud 140 REALLY is. It is fun knocking hard in a jeep.

A guy over on roe broke 150 in a soft top tj. That's impressive
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2001 WJ Limited 4.7, lifted, locked, KM2's
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Old 12-08-2013, 10:23 AM   #19
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Spl does drop when i open a door, but thats just to the ear, it might actually go up. I'll know what works tomorrow when i meter it. And yeah, theres so many people who think "my sony xplod does a 157" that its hard for non-audio people to understand what something actually does meter. Im excited to see what it does. Never seen a setup like this in a jeep before, so hopefully more people will see that you can be loud with not much power or cone area.

And ive seen that jeep in person. He used to have 5 15's, then he went to 6 12's. It does a 154 i believe. VERY impressive for a softtop. There another guy on caraudio.com (LouisianaCRX) thats doing 155-156 with 4 12's under the window line in a hardtop JK.
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Old 12-08-2013, 09:20 PM   #20
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Post up your numbers, im curious to see what it does. I wanted to get my sundown on the meter(just for fun) but around here its a pain to do, and they want a ridiculous fee for a session. The particular store isn't really too thrilled when you break the 130 mark on "flea market" brands they dont carry. They have a "lane day" a few times in the summer, more of a sales plug then anything, but open to anybody to get on the meter. Burped a 135.2(personal best, non jeep) with a single 12" brahma in just over 2 cubes @38hz with an old punch 501s amp. I think we sparked too much interest and they made us leave. Said we had high dollar setups and it wasn't fair to them(the shop) for them to compare. Their shop truck had 6 15's and was doing mid 150's, so it had us confused. Weird, everything I had was bought 2nd hand, and I had maybe $300 in it. They were even a RF dealer. After that i realized why the car audio world is so screwed up. Most shops are filled with bs knowledge and lack of skills. Nothing is custom, and its pre-fab, combo kits, and all kind of other bs. Btw i checked out your page, glad there's still guys out there staying true. You do some very clean work. Most guys would rather make money from $69 hu's then do custom installs
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Old 12-09-2013, 09:13 AM   #21
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That would have pissed me off dearly if they kicked me out for "showing off a high dollar setup" because it might redirect the kids who were going to buy their crap to buying something of quality. I used to compete in MWSPL and Usaci, since thats what was close to me at the time. I actually took home 3rd place at dB Drag World Finals 2009 in Amateur Psychlone division. That was a lot of fun. I bet that Brahma sounded nice. I can still remember when everyone who wanted to build a custom sub would use Brahma motors. Their softparts were the weakest link, but those motors had an amazing amount of gauss in the gap.

The cool thing about Oklahoma is, a lot of shops (except for the major national chains) carry DD (since theyre based out of OKC). So, you actually have some shop owners who can see past the Alpine, Kicker, JL bull and see a high end DD9512 for less than a 12w7.

And thank you. Box building is really just a hobby of mine to make some extra cash, i really prefer furniture building (takes a lot more patience and skill). But, sub boxes pay the bills so whatever. Haha.
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Old 12-09-2013, 02:53 PM   #22
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Its funny, because this particular shop carries RF, JL, Clarion, Pioneer, Eclipse. Their main selling point is quality, and more for your money. While I can't say much about JL(at least w3 or better), all of those companies have dont have the same product as they did years ago. I've bought better quality equipment, for cheaper. The IDQ I had would but all of the name brands to shame as far as sq, while still getting louder(with the exemption of the w7). ID's customer service is also outstanding. I think people are so used to buying in a name everyone recognizes, that they are scared to venture out and try something new.
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3" BDS front coils, 2.5" OME HD rear coils, 33x10.50 KM2's, 15x8 Soft 8's, Skyjacker Hydros, RE Superflex arms, SYE/CV

2001 WJ Limited 4.7, lifted, locked, KM2's
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Old 12-09-2013, 03:54 PM   #23
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Old 12-09-2013, 04:42 PM   #24
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That's awesome. I bet it pounds. I know on Lil Jon's B.M.E click, off of the kings of crunk album slams on mine.
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3" BDS front coils, 2.5" OME HD rear coils, 33x10.50 KM2's, 15x8 Soft 8's, Skyjacker Hydros, RE Superflex arms, SYE/CV

2001 WJ Limited 4.7, lifted, locked, KM2's
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Old 12-09-2013, 07:05 PM   #25
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Seales up LEGAL score!!!



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Old 12-09-2013, 08:13 PM   #26
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Congrats. That's awesome in a soft top jeep with a single 10. What ohm load are you running the amp? By the output of the amp im guessing 4, or possibly 2. Where was the mic? Doors open/closed? Windows up/down? With my doors closed and windows up, you can seenthe soft windows bulge out. Its pretty funny looking. Is that going to be your permanent setup(if there is such a thing) or do you plan to run it for awhile and change it up? Also did u use winsd to model it before you built the box?
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2000 TJ 4.7 ATK Stroker/32rh
3" BDS front coils, 2.5" OME HD rear coils, 33x10.50 KM2's, 15x8 Soft 8's, Skyjacker Hydros, RE Superflex arms, SYE/CV

2001 WJ Limited 4.7, lifted, locked, KM2's
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Old 12-09-2013, 10:37 PM   #27
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Running the amp at 2 ohms so after impedance rise im looking at about 5-600 wrms. Mic was on the dash sealed up. Legal style. only vehicle ive been in that was louder sealed up than with a door open. Haha. And i use BassBox 6 Pro when designing bandpasses so i can see impedance curves and vent velocities (stuff you cant calculate normal until the box is already built). I do all my calculations by hand though. WinISD not good at all for someone trying to learn box design. BBP6 is a ton better, but even then you still need to account for cabin displacement/geometry. Both programs are for wide open rooms, not presurrizable (is that even a word?) Vehicles. Im VERY happy with that score. There are still a lot of people unable to do that number with more equipment in an actual vehicle.
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Old 12-10-2013, 06:55 AM   #28
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OP, nice setup!
Are you doing anything for security??? That would make me a bit paranoid...
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Old 12-10-2013, 02:20 PM   #29
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Rabid pit bull. I actually used L brackets to mount my box, but the part that screws to the floor are under the box. I stripped out the heads on the part that attaches to the box. I built my box so the box can't come out unless you fold the rear seat. You can't fold the rear seat unless you open the tailgate and drill out the stripped screw heads. Hopefully by the time they get that far someone will have spotted all of this and run them off. There really isn't too much you can do, if they want it bad enough, they'll get it. I try not to make alot of commotion in the parking lot. I had someone steal my CB and rugged ridge mount, but didnt touch my box?

OP, yea its weird with Jeeps. Most rigs get noticably louder with a window cracked or door open. From 30hz-40ish mine is louder all sealed up. From 40-80 its louder with the windows down a little. I use bbp6, then check my specs on winsd. I just like a second opinion, as I've only personally built myself a few ported boxes. I've assisted in a good bit, but it's just not the same. This was my first round port box attempt. Since I was doing a behind the seat box, it seemed a little easier to do a round port. I went with 4", and after a little help from the diyma crowd, didnt try to flare it. I was a little worried about port noise, but dont have any. I also built my box based off 10" ssa gcon specs, because I knew I'd eventually upgrade. When I modeled those dimensions for the E10 it would work pretty good for it as well. Winsd showed the e10 to be a little peaky, but in the Jeep its really not bad at all. It still has twice the out put of the sealed box I made(downfiring also), and sounds 10x better

Definitely not as clean as yours but here's mine





Since I took these pics, I uses the belt sander to get the edges flush and round-over'd the edges. I also opened the bottom up at the rear, and on the passenger side. I was having loading issues with the enclose rear and sides. I still haven't covered it yet, but after seeing yours I think im going to try that out
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3" BDS front coils, 2.5" OME HD rear coils, 33x10.50 KM2's, 15x8 Soft 8's, Skyjacker Hydros, RE Superflex arms, SYE/CV

2001 WJ Limited 4.7, lifted, locked, KM2's
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Old 12-10-2013, 07:27 PM   #30
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Awesome. It's always nice to see people building their own stuff. It might not be "professional", but it's a lot better than buying a cheap crappy prefab box. One thing you might actually do if you want to stick with ported boxes is firing the port down. for a 4" aero you only need 2" distance between the mount of the port and the floor of the vehicle. That will give you your backpressure that I know you're losing firing any other way. The only reason forward firing is working for me is because it's a 4th order, so the sub can "load-up" in the sealed chamber. I like the design though. And I'm very glad to see you using ALL of your available space (slanted front to match seat angle).

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