helppp!! not new to car audio but stuck on this...

[killakilck123]

ok

ok my measurements in my jeep are (between the wheel wells) is 35 inches... if i stand at the trunk i can go back from the trunk of my car to the front seats which is about 20-24 inches (width) which would leave room for cap and amp.. and (height) is no problem but 18-20 inches would be fine.

 

[killakilck123]

also do i use half inch wood? 3/4 inch wood? pressed wood? exactly what kind do i get?

 

[annunaki]

also do i use half inch wood? 3/4 inch wood? pressed wood? exactly what kind do i get?

3/4" MDF will work best here. 3/4" cabinet grade plywood also works (13ply).

The MDF is the most cost effective though around $25.00 per sheet. If you use screws you must pre-drill your holes. 1-5/8" coarse thread drywall screws work well.



With the dimensions that you have given for your space here is what I come up with for an enclosure size.

EXTERNAL DIMENSIONS:

Width: 35"
Height: 20"
Depth 24"

Woofers would be on the 20" X 35" plane as would the vents.

The enclosure would be sectioned in half internally.

Each INTERNAL HALF of the enclosure would have dimensions of:

Width: 16.375"
Height: 18.5"
Depth: 22.5"

The vent dimensions in each half of the enclosure will be:

Height: 18.5"
Width inside of vent: 1.625"
Depth: 39"

The vent will need to be labyrinth style to completely fit it in the enclosure along with rounding off the edges of the vent pieces internally to prevent sharp edges.

After some woofer, bracing, and vent displacement, net internal volume ends up at 2.704ft^3 and a tuning frequency of 25.97hz. Small compromises but one you would probably not hear/notice. Because of the size restrictions you will lose a little bit of low end response but it will allow it to get a bit louder.

Please look at my build threads in my signature with vented enclosures to get an idea of how to construct the enclosure properly with adequate bracing. These photos would also help out whomever is helping you to construct the enclosure.

I would offer to build it for you for a fee but shipping would be outrageous on 90+ lbs of MDF.

 

[killakilck123]

ok

3/4" MDF will work best here. 3/4" cabinet grade plywood also works (13ply).

The MDF is the most cost effective though around $25.00 per sheet. If you use screws you must pre-drill your holes. 1-5/8" coarse thread drywall screws work well.



With the dimensions that you have given for your space here is what I come up with for an enclosure size.

EXTERNAL DIMENSIONS:

Width: 35"
Height: 20"
Depth 24"

Woofers would be on the 20" X 35" plane as would the vents.

The enclosure would be sectioned in half internally.

Each INTERNAL HALF of the enclosure would have dimensions of:

Width: 16.375"
Height: 18.5"
Depth: 22.5"

The vent dimensions in each half of the enclosure will be:

Height: 18.5"
Width inside of vent: 1.625"
Depth: 39"

The vent will need to be labyrinth style to completely fit it in the enclosure along with rounding off the edges of the vent pieces internally to prevent sharp edges.

After some woofer, bracing, and vent displacement, net internal volume ends up at 2.704ft^3 and a tuning frequency of 25.97hz. Small compromises but one you would probably not hear/notice. Because of the size restrictions you will lose a little bit of low end response but it will allow it to get a bit louder.

Please look at my build threads in my signature with vented enclosures to get an idea of how to construct the enclosure properly with adequate bracing. These photos would also help out whomever is helping you to construct the enclosure.

I would offer to build it for you for a fee but shipping would be outrageous on 90+ lbs of MDF.

OKay.. now for one.. what do you mean by labrynth style? and also how many sheets of this mdf will i need? my dad should know but still it would help for me to tell him. do you think maybe you could draw a picture on paint or scan it to exactly what this box should look like?

also it will have 2 vents right? kind of like this right? with 0's being subs and 1's being vents?
0 11 0

????

 

[killakilck123]

also in your demensions you said the depth of the vent is 39inches? was that a typo? bcuz if external is 24in depth how could the vent be 39in????

 

[annunaki]

also in your demensions you said the depth of the vent is 39inches? was that a typo? bcuz if external is 24in depth how could the vent be 39in????

No typo. It follows the inside of the enclosure. I will see if I sketch it up in paint today or tomorrow. Have some patience on that please.

It will most definitely take 2 sheets of MDF.

 

[zumbo]

A quick Google search of the term Labyrinth Slot Vent led me to find it's a L like maze within the box for the air to follow. This creates an amplified affect.

 

[zumbo]

Found a pre-fab box with labyrinth slot vent. Internal volume is less, and tuned higher. But, it's an option.

Watch the video at the bottom.

http://cgi.ebay.com/12-Dual-Labyrinth-Slot-Vented-Subwoofer-Box-/220699276378?pt=LH_DefaultDomain_0&hash=item3362b3b45a

 

[annunaki]

also in your demensions you said the depth of the vent is 39inches? was that a typo? bcuz if external is 24in depth how could the vent be 39in????

Below is a sketch up of what I was mentioning in regards to a vent. This should be understandable how to construct for anyone with some experience in wood working.

 

[killakilck123]

okkkk

Below is a sketch up of what I was mentioning in regards to a vent. This should be understandable how to construct for anyone with some experience in wood working.

ok annunaki, my father understood the sketch very well. the only thing we were a little confused on is the walls inside the box.. in you sketch there is a line going thru the vents. is it really lik that? so it will have 2 seperate vents? or will it just have one lik the pics that zumbo posted. im guessing it has a piece of wood in the middle blocking both vents from eachother but let me know

thanks for all the help so far guys, plz let me nkow

 

[Alex2507]

ok annunaki, my father understood the sketch very well. the only thing we were a little confused on is the walls inside the box.. in you sketch there is a line going thru the vents. is it really lik that? so it will have 2 seperate vents? or will it just have one lik the pics that zumbo posted.

thanks for all the help so far guys

That is two vents. Consider it two boxes sharing a common wall.
You should be able to bang that out by lunch, right?

 

[annunaki]

ok annunaki, my father understood the sketch very well. the only thing we were a little confused on is the walls inside the box.. in you sketch there is a line going thru the vents. is it really lik that? so it will have 2 seperate vents? or will it just have one lik the pics that zumbo posted. im guessing it has a piece of wood in the middle blocking both vents from eachother but let me know

thanks for all the help so far guys, plz let me nkow

Yes it is like that purposely to have two separate enclosures. It must remain in place.

 

[zumbo]

There is an internal picture on this link to help with the design. Just ignore the square opening. The internal shot is just one side as well.

I guess I should say the L is more like a J. LOL!
http://www.rtboxes.com/sub-boxes-woofer-manufacturer-dual-jl-328/

 

[killakilck123]

ok for sure thanks guys. im going to start building the box tomorrow i will post if i have any problems. ill keep you posted and then put pics up of box
L

 

[zumbo]

ok for sure thanks guys. im going to start building the box tomorrow i will post if i have any problems. ill keep you posted and then put pics up of box
L

Can't wait to see the pics!

Did you order the subs?

 

[killakilck123]

no i havent, im going to get them tomorrow. the only thing is i contacted Ram designs and they told me they didnt lik this box design but they didnt give me a suggestion so im going to do it any ways

 

[annunaki]

no i havent, im going to get them tomorrow. the only thing is i contacted Ram designs and they told me they didnt lik this box design but they didnt give me a suggestion so im going to do it any ways

Why didn't they like the design? I am curious...

 

[killakilck123]

Why didn't they like the design? I am curious...

THIS WAS HIS EMAIL......


I personally wouldn't build that box. It's simply too big and tuned too low. You're looking at 2.85ft^3 for each sub with a 25.5hz tuning. I'd do a common chamber with a volume of 4.5ft^3 and a 32hz tuning. That'll give you plenty of lows without sacrificing your upper end response.


Ryan A. Miskin - owner of RAM Designs
www.ram-designs.com


SO IF YOU THINK HE IS RIGHT THEN PLEASE GET ME ALL OF THE DEMENSIONS AND MEASUREMENTS RIGHT AWAY I LITERALLY JUST WENT OUT AND BOUGHT $70 OF 3/4IN MDF.. AND IM STARTING TOMORROW SO PLEASE GET BACK TO ME ASAP GUYS

 

[annunaki]

This is for a car remember. You run a higher risk of damaging woofers the higher one tunes the enclosure. This is especially true with today's rap and "boom" music. Tuning higher will allow for a boomy sound and probably gain a db or two in max output but is not worth sacrificing smoother/deeper response. It is not too large either. It possibly doesn't fit any of his ready made jigs which lowers his margins

 

[GranteedEV]

This is for a car remember. You run a higher risk of damaging woofers the higher one tunes the enclosure.

This is true, but tuning too low also runs the same risk at certain frequencies above Fb.

I didn't do any modeling so I don't know if you tuned too low or anything, btw. Just saying that you don't want to tune too high OR too low.