4 Type-R 12s Ported In Extended Cab

[OneKrazyKeebler 10+ year member]

I really need some help designing my box. I would just get someone to do it, but it has to be exactly a certian size. I set my seat where I wanted it and got these maximum measurments:

Height: 25 3/4"

Top Depth: 10 1/2"

Bottom Depth: 20 1/2"

Width: 47 3/4"

The baffle will be about 27 1/2" high

I am not sure how to tune or port the box because it is at a slope. Its not really steep, just not perfectly square.

I have already cut a couple boards just messing around so I am pretty sure these are gonna be the best bet for what I am doing.

Anybody have any suggestions? I need all the advice I can get.

BTW, this will be going in a 98 Dakota Club Cab (ext. cab) and I haven't actually got the Type-Rs yet, but kinda have heart set on them after reading up on them. Price/Performance cant seem to be beat.

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[OneKrazyKeebler 10+ year member]

Gotta be someone out there with an opinion.

 

[OneKrazyKeebler 10+ year member]

WTF, I know someone has done a box for 4 12s or at least knows where I should start in the design process.

 

[ContourSPL 10+ year member]

those dimensions give you roughly 11 cubic feet. You could go with a 4.5"x20" port, about 11" deep, across the top of the box with subs firing forward, that gives you around 2.5 cubic feet per sub tuned to 36 hz. I don't know the displacement of the subs so some changes might have to be made.

 

[vetkilr 10+ year member]

Its gonna be smaller then that once you take out the wood/sub displacments/port displacement and such..............

But Im goin to bed..........

For a type R 12 to sound really really good you need 3 cubes 40 square in port per sub and tune it around 33-35hz........smaller you lose output.Now if you goin with 4 then you could do 2 per box with 5.5 cubes and 50 square in port and 35 hz of tune....I would never put 4 subs in same box but thats me.

 

[OneKrazyKeebler 10+ year member]

Thanks guys. I think I will start drawing it out with a drawing program. I was kinda hoping it would be ok to use aeroports. I have heard that a single type-r 12 would need a single 6" aeroport to sound right. Would it be ok to use 4 of them in the middle of the subs?

Or would it be better to just divide the box into 2 chambers with 2 subs in each chamber with 2 aeroports in each?

Or are aeroports even worth the hassle? They are just PVC pive right?

 

[vetkilr 10+ year member]

I wouldnt go more then 2 subs per box.........

Aero ports arent just pvc pipe.they are flared and are better.

Yes one 6" per sub is great.

 

[ContourSPL 10+ year member]

one 6" flares for two subwoofes would work too.

 

[vetkilr 10+ year member]

one 6" flares for two subwoofes would work too.

True but seein how its in a truck Im concernd with port noise and I wouldnt use 1 per 2 subs.

 

[OneKrazyKeebler 10+ year member]

Yeah, I was kinda concerned about being so close to the subs as far as sound quality goes. Port noise would just make it more of a worry for me.

I believe I will use one 6" port per sub. Ive heard it from more than one person.

There seems to be a couple questions that keeps getting to me though.

How long will the 6" ports need to be?

Where will I put them? or tune them? Remember that the ports will probably be in the center of the slanted baffle.

I was really wanting to mount my amp on the top of the box. Its 29.5" long so Its almost a lost cause putting it anywhere else. My other amps will be mounted one on each side.

I was thinking about putting one on each side of my amp on top of the box, and 2 in the middle of the box. Or would it be more effecient to put them all together in the middle?

 

[OneKrazyKeebler 10+ year member]

Im drawing out my box idea now.

 

[vetkilr 10+ year member]

Its worth the money to pay for some good plans on here IMO.

PM iamamp3pimp hell work hard for ya and help out.

He has a hell of a wall in his car with Slot ports so dont rule them out.........cheaper and they work............

 

[OneKrazyKeebler 10+ year member]

Thanks, It just doesnt seem to be a typical box. Its not just something you can throw in a trunk or the back of an suv. I dunno. I guess the way I see it, I will appreciate it more and learn more about it if I do it myself. Its just me.

 

[ContourSPL 10+ year member]

subs forward with port across the top will be loudest in an extended cab //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[OneKrazyKeebler 10+ year member]

That is what I might do then. The width of the box is about 3 inches too short to go strait accross with them. I guess I will just have to figure out how to mount the amps somewhere else. It might be worth it to mount them in my bed seems how i have a fiberglass toneau cover.