Sticky: GREAT DESIGN for 3 cubes @ 30hz

[iamamp3pimp 5,000+ posts]

i thought 2.5 for the L7 would bee too much.......

I was wrong

 

[SHiZNiLTi 10+ year member]

I just finished building this box for my friend Kyle's Scion Tc tonight,

I used the design that I made shown above, this box fits like a glove perfect for his ride.

We are waiting on the 12" Alpine sub to come in before we cut the hole for the woofer and put the top on.

We used some crazy strong wood glue, 120 nails small and large with the air nail guns and some wood sealent just to make sure there no air leaks. This thing is hella solid...

My buddy Kyle just holding the cuts together making sure everything looks good before we start the project...

Good Idea to paint the inside of the port black before you put it all together...

Husky air nail guns...

Hella tight...

Will look good once it's carpeted black...

The factory cover still works so the system is not visable from outside...

Pic with the top off to expose the tuned port at 30hz...

Another angle with top off, notice the double thick front, no flex allowed...

Can't see it from outside...

Pic from inside with the back seats down...

What the end result will be like, this guy uses close to the same design...

http://www.realmofexcursion.com/videos/Alpine/typer12.51.wmv

 

[mlstrass 5,000+ posts]

Box looks good. Does that sub really need 40+ square inches of port?

I built a box today for a SS RL-p15 and it has 36^2 of port. Building the second box tomorrow.

Download Cutlist Plus, free and easy to use.

 

[SHiZNiLTi 10+ year member]

Can anyone tell me what the downside of having too big of a port?

What other woofer would really wang in this box?

 

[OneKrazyKeebler 10+ year member]

Can anyone tell me what the downside of having too big of a port?
What other woofer would really wang in this box?

Sub not being able to move that much air i would say

There are alot of subs that would sound good in that box. The choice is yours.

 

[xluben 10+ year member]

Can anyone tell me what the downside of having too big of a port?
What other woofer would really wang in this box?

none, if it's tuned to 30Hz, that's all that should matter.

bigger port = better = lower port air velocity = no port noise

that box looks great! you're workmanship is awesome. i love using an air powered brad nailer, so much faster than screw!

 

[CBFryman2 5,000+ posts]

There is a point of diminishing returns with port area. It usually starts at ~80% of total cone area.

 

[PSturmer 10+ year member]

Box looks good. Does that sub really need 40+ square inches of port?
I built a box today for a SS RL-p15 and it has 36^2 of port. Building the second box tomorrow.

Download Cutlist Plus, free and easy to use.

with alot of power it does. i made a box 2.95 @ 32 with 30 sq inches of port area for a 12'' type R and it had port noise.

i am now using a box with 56 sq inches of port area and its doing just fine.

 

[CBFryman2 5,000+ posts]

If you had a bend in the port that may have been what caused the port noise. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[xluben 10+ year member]

There is a point of diminishing returns with port area. It usually starts at ~80% of total cone area.

so that's probably about 75in^2 for a 12" sub.

do you mean it's actually worse to have a port larger than that, or that it's just not worth it?

 

[CBFryman2 5,000+ posts]

Depends on the individual application. Could show no improvement or actually start to loose SPL and act like a Transmisison Line with down syndrome.

 

[mazdakid 5,000+ posts]

If you had a bend in the port that may have been what caused the port noise. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

how would you fix that?

 

[ruger 10+ year member]

did you get the sub in there yet?

box looks great.

 

[saywhat? 5,000+ posts]

your friend looks EMO. and if this thread did anything, it showed kinda how to mock up and build a nice little enclosure. 3 cubes for a FTW. thats what my BTL is getting.

 

[SHiZNiLTi 10+ year member]

your friend looks EMO. and if this thread did anything, it showed kinda how to mock up and build a nice little enclosure. 3 cubes for a FTW. thats what my BTL is getting.

LOL @ EMO, he actually hates people like that. Most EMO's in scottsdale are fruity, thye talk about stealing there moms hair dye so they can color each others hair - I over heard this gay crap at tacobell once and wanted to beat there *** //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

Anyway's the Sub should be here Thursday and I'll make a tight video of the sub in action. It's gonna be much better then other videos that you see because my buddy Kyle the drummer of this band and he has some badass $400 mics that are made to pick up bass from a bass drum. It should come out very well.