Enclosure Design Fundamental Q:s

[TimberJon 10+ year member]

found this great site, before we started talking about the different grades of MDF. i only saw the MDF vs Particleboard pictures, i didnt know the cheesy one was particleboard. thats where i got the idea that there were different grades. learning quite a bit about box building from this site... ill share it with the other thread on box basics.

 

[TimberJon 10+ year member]

found the JL shipping baffle. its 1/2" MDF just as i suspected... muwahaha...

 

[TimberJon 10+ year member]

http://www.safeandsoundct.com/files/460x345/4_impalass09.jpg

looky this pic. While its not my system inspiration, its clean.

This is an impala SS. sucker has room in the trunk... my car really doesnt.

BUT, im confident i can fit a clean install in there with 2 W7s. this guy has 3 W6s i think. what really caught my eye was this huge custom MDF box for the subs and the amps. one huge sealed box for all 3 subs? hope he has braces in there! cuz i dont see any screws.

http://www.safeandsoundct.com/files/460x345/4_impalass08.jpg

how tall you think that box is? 4 inches? plus the vinyl floor another 1/4" max?

my poor trunk aint all that deep to start out with...

and holy hell. BMW 740iL (my cars trunk is nothing compared to this monster)

But still, should plan one of these up?

http://www.safeandsoundct.com/files/460x345/1_703_bmw07.jpg

 

[paikiah 5,000+ posts]

the triple JL's look awesome. Ah yes, maybe he's only used glue to secure his box. A person here that goes by the name of ramos, he's actually carried out an experiemtn, to make a large box without the use of ANY screws. It worked, and supposedly worked very well.

As for the BMW box, look salright, although I'd much rather go for the conventional rectangular boxes instead. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Oh, and try to look for bigbassman's car pics... now, THAT is what i call a box..a wall, in fact.

I don't recall you say what car you're going to install, but a lot of cars can swallow 12" subs without much fuss.

 

[TimberJon 10+ year member]

Sounds like it would work. but the larger the box i would think the less the stress on the joints, so glue would work. the site for the impala and BMW pics is http://www.safeandsoundct.com

their complete system gallery shows some of the installs, including the impala and BMW.

can i get any ideas from them?

My install will be 2 JL 300/2's, 2 JL 1000/1's, 2 JL 12W7-3s, and i was going to get their 3 way component set.. but a good look at the 2004 buyers guide told me there are better component sets out there..

Of the sets im looking at, 2 i know to have great quality seem to be crossing each other off my list. correct me if im wrong, but heres why.

All have a tweeter, midrange, and woofer. i chose sets based on having those components, included crossover, and the largest driver being 6.5"

Do you know off hand if any of these sets' midrange drivers are larger than 4"?

Again, please correct me if any of these #s are wrong. I dont quite trust the magazine i got these figures from because many conflicted in other areas in the mag.

brand..........................model#..........MSRP(+/-).........max RMS

----------------------------------------------------------------

**JL............................XR653-CSI........570........................90

**Focal.......................165V3E.............729.......................160

Alphasonik..................PCT6551...........450.......................175

Audiobahn..................ABC6003Q.........400.......................320

Audiobahn..................ACIS63..............550.......................320

Audiobahn..................ACIS62..............460.......................200

Image Dynamics.........CSI.6MH............589.......................200

Planet Audio...............V63CK...............279.......................250

Swiss Audio................SAC650.............200.......................120

 

[paikiah 5,000+ posts]

Sometimes the best ideas come from making small models, which is what I did. I had plenty of thin scrap plexi lying around, so I "cut" them into panels and tried assembling them in various aspects. It helps a lot when calculating complex enclosures.

wow, dual W7's, and dual 1000/1. That's a LOT of power and a LOT of bass. There's another person on this site that has the same layout, although I forgot his login name. Awesome setup in his truck.

All the components that you've listed, I'm not too familiar with them. The JL and focal, yes, they are 6.5" drivers, I think.

On this forum though, the most popular components are CDT-61A's from http://www.thezeb.com They get the job done right, from what I've heard.

You don't need a three way component set. A lot of 6.5" and tweeter combo will give you delightful tunes. Also, be advised, you don't need a lot of power to run components.

If I were you, I would go with the W7's like you planned, the dual 1000/1, a single 300/2, and a single set of the CDT's or perhaps what I run, dynaudio.

SQ cars have speakers in the front, and with imaging, music must come from the front, and not from the rear. This is why I didn't talk about rear fill.

 

[BryBrySmash 10+ year member]

http://www.jlaudio.com/subwoofers/pdfs/12W7_MAN.pdf

Look at thte bottom of page four. You cant go wrong with JLs recommended slot-ported box design for the W7. When I had my W7s in my '77 bronco, I used the sealed design that came with the sub. The only modifications to the plans that I made were making the MDF baffle 1-1/2" thick by laminating two 3/4" pieces together and using 1" MDF for the sidewalls. JLs ported design yields 1.75 cu.ft. tuned to 32 Hz. Dont second guess yourself by designing your own box. The works already been done for you by the manufacture so utalize it.

Bronco Install: http://www.jlaudio.com/Gallery/Installdetail.cfm?Action=3&Veh_ID=467

 

[TimberJon 10+ year member]

What about Visonik component sets?

 

[TimberJon 10+ year member]

http://www.jlaudio.com/subwoofers/pdfs/12W7_MAN.pdf
Look at thte bottom of page four. You cant go wrong with JLs recommended slot-ported box design for the W7. When I had my W7s in my '77 bronco, I used the sealed design that came with the sub. The only modifications to the plans that I made were making the MDF baffle 1-1/2" thick by laminating two 3/4" pieces together and using 1" MDF for the sidewalls. JLs ported design yields 1.75 cu.ft. tuned to 32 Hz. Dont second guess yourself by designing your own box. The works already been done for you by the manufacture so utalize it.

im not going to second guess the Manufacturer. Ive already had a nice email chat with one of the guys there at JL. Theyre quite helpful if your email is labeled correctly, and he offered to help me with the finals when i hammered out all my details.

The custom box im designing is meant to conform to the very back of my trunk. Im trying to save space, plus my car is the GXE model, which for some reason has a bump in the middle of the floor in the trunk while other models dont. SO i have to build my box around that, the largely curved backboard, and quite possibly the 6x9s that hang way too low.

Im probably going to double up on the front baffle. After thinking 1", and reading some other websites, like lungster, i decided to make it 1.5". laminating it and sealing it together isnt a bad idea... screws as well? I doubt i could find it at 1.5" thickness. I will call the MDF manufacturers listed on the Lungster site.

I have the manual saved to desktop since 02. Im not going to play with their power figures. Though Ngsm13 recommended 2 cubes per W7 ported, tuned to 26 hertz or 28 or something like that. Id like to find the middle ground between droning bass and punch.

My slots will be to JL specs, but might not in volume. I still have not gotten to how much volume i should put in my box. With all the bracing i plan to use, i will have to make the box bigger, by doing so i will try to make it wider. again, to conform to my trunk.