Seen this box before? Subs INSIDE of square port?

[audioholic 5,000+ posts]

Ya I getcha, idea scrapped.
Thinking of just building a wall for 2 15's, using the SDC's on some high power, run em til they blow, then pick up some HD3 15's and slap em in. I just dont have the room in this stupid infiniti trunk for 4 15's walled I guess

Good luck with your project. Keep us posted.

 

[grimreper912003 5,000+ posts]

If you give us max dimensions we can help.

 

[drpeeb 10+ year member]

Basically im not happy with my wall, didnt get what I want from it, and I think the port is just to small, only 160" for 4 15's..... but thats all I could come up with, to fit in my limited front baffle area (max 33 height, 37.5 width)...

Any help/tips/tricks/links appreciated.

Maybe somebody already suggested this, maybe even you, but what about this config:

View attachment 26511669

Of course that square could be a rectangle instead.

Just do your box/ port calculations to get the port area and length tuned to what you want. No?

 

[Fuknmovin 10+ year member]

What about running the subs all at an angle facing slightly away from each other to minimise(sp) the cancellation?

 

[WOT]

Maybe somebody already suggested this, maybe even you, but what about this config:
View attachment 26511669

Of course that square could be a rectangle instead.

Just do your box/ port calculations to get the port area and length tuned to what you want. No?

That dont work, Ive only got 37.5" max width, 2 subs side by side is 31" Thats why I was stuck with a 5.5" port on my first box....

 

[drpeeb 10+ year member]

That dont work, Ive only got 37.5" max width, 2 subs side by side is 31" Thats why I was stuck with a 5.5" port on my first box....

Not sure what's going on. Here's a to-scale drawing using your max dimensions, plus a 1" buffer on all four sides. I used 15.5" diameter for the subs.

We should be able to figure this out ...

View attachment 26511687

 

[WOT]

Youre telling me if I space the subs out on each corner theres a square THAT big in the focal center of them?

Shit no way. I might have to draw this out on a piece of MDF later

15X15 is 225" of port.... hmmm I think I might want more I may even try a port like this

I obviously dont have specs as I dont have a box or total volume on hand. But that would give me quite a bit of port area eh.... Im not much of a woodworker (i just bought my first table saw) and have done much if any angled cuts... but I think that simple enough with 45* angles to pull off

 

[audioholic 5,000+ posts]

Unless you have the depth to make that port straight and still get the tuning you want, I think you'll find that port shape to be a bit difficult to work with.

 

[drpeeb 10+ year member]

Youre telling me if I space the subs out on each corner theres a square THAT big in the focal center of them?
Shit no way. I might have to draw this out on a piece of MDF later

15X15 is 225" of port.... hmmm I think I might want more I may even try a port like this

I obviously dont have specs as I dont have a box or total volume on hand. But that would give me quite a bit of port area eh.... Im not much of a woodworker (i just bought my first table saw) and have done much if any angled cuts... but I think that simple enough with 45* angles to pull off

v3 below. This gives you a total port size of 107.2 square inches. I have no idea if that's appropriate or what you want; It's just the biggest you can reasonably get while leaving at least 1" all the way around ... which is leaving very little MDF for this front wall piece! It's gonna be flimsy! You should use the thickest MDF you can, like 1" (or more?!), & internal bracing, so it doesn't break. You can actually use the interior port walls as part of that bracing.

View attachment 26511688

 

[drpeeb 10+ year member]

Unless you have the depth to make that port straight and still get the tuning you want, I think you'll find that port shape to be a bit difficult to work with.

Very difficult! But possible I think ...

 

[audioholic 5,000+ posts]

Very difficult! But possible I think ...

Oh its definitely possible. Ive seen much more complex port shapes than that. But the OP has already said he's not a good wood worker. *shrug*

 

[WOT]

Unless you have the depth to make that port straight and still get the tuning you want, I think you'll find that port shape to be a bit difficult to work with.

I do definetely have the depth to keep it a straight port with no bends, Ill have about 26-28" depth if I remember correctly

 

[WOT]

v3 below. This gives you a total port size of 107.2 square inches. I have no idea if that's appropriate or what you want; It's just the biggest you can reasonably get while leaving at least 1" all the way around ... which is leaving very little MDF for this front wall piece! It's gonna be flimsy! You should use the thickest MDF you can, like 1" (or more?!), & internal bracing, so it doesn't break. You can actually use the interior port walls as part of that bracing.
View attachment 26511688

You are leaving me WAY to much room here, Im gonna use 3/4"and Im gonna squeeze it much more than the picture you have drawn. If you look at my pics of my current wall, I put the subs in the farthest most corners, so the subs are overlapping the outside walls. The cutouts will only have to be 3/4" away (wood thickness) from the corners, and just have the sub overlap on the outside.

And I can bring the port to atleast 6" width and have the subs overlap the port wall. Giving me substantially more port area, plus the little square in the center of it. I would love to have over 240" of port though

Im gonna have to build this box in the car, if I want to go over 30" height. And its gonna be **** tricky for me..... with all these angles....

I wish I knew my box dimensions right this second

I think I may just end up building everything in the car minus the front baffle and port, come back here with my measurements and final volume and such, and get some help on how this ports gonna have to be made.

Id tear out the **** wall today if it wasnt raining outside

 

[WOT]

Im also liking the center port design as it will act as a great brace for the top and bottom, and I will just go for some threaded rod for the left and right walls

 

[WOT]

I really need to find a kreg jig or something though, how the hell am I supposed to assemble this thing in the car ie screw panels together form the INSIDE of the box, I wont have access to the outside