problems with box/wall build....

[tommyk90 5,000+ posts]

Alright well I put 7 inches on each side of the port. Then I made a port plug which cut the port width down 1 1/2" and I made the port 1 1/2" shorter, height wise.
Here is what it looks like now without the port plug



Then of course like I said with the port plug it cuts the port width down to 1 1/2" and I also made the port height 1 1/2" shorter.

It sounds better than it did....but it still seems like its tuned high and its still not really loud.

While the 1.5" wide port knocks the tuning down to 37 hz, you DRASTICALLY reduced the port area, which is choking those subs.

Try making a port plug that has a 3" wide opening (with the 1.5" height reduction still), but make it 20" long. This will give you a tuning of 35 hz, with a decent amount of port area, and without taking up TOO much box space.

That's all I can really recommend right now.

 

[ThatChevyGuy 5,000+ posts]

i see a new wall in the midst.

 

[iamamp3pimp 5,000+ posts]

yeah man to be hoonesty you should probably rebuild it.

i mean once you have so many problems with it, its just easier to scrap and start over

look at my wall threads in my sig, that can give you an udea of what you really have to work with

you can go way deeper than 14 iunches....

 

[audioholic 5,000+ posts]

Alright well I put 7 inches on each side of the port. Then I made a port plug which cut the port width down 1 1/2" and I made the port 1 1/2" shorter, height wise.
Here is what it looks like now without the port plug



Then of course like I said with the port plug it cuts the port width down to 1 1/2" and I also made the port height 1 1/2" shorter.

It sounds better than it did....but it still seems like its tuned high and its still not really loud.

Not trying to be an ***, but you need to have someone come help you I think, you really dont know what you are doing yet.
Look what you did man, you completely hosed your port area. Im shocked nobody else noticed. Your port is 5" wide as it exits the box, but you split it into TWO 5" wide slots at the back of the box. Uhm, that totally changes your port area (doubles it). So who knows what your tuning is now.

Start over, that box is ruined. Get some help. But keep your chin up, shit happens.

 

[tommyk90 5,000+ posts]

Not trying to be an ***, but you need to have someone come help you I think, you really dont know what you are doing yet.
Look what you did man, you completely hosed your port area. Im shocked nobody else noticed. Your port is 5" wide as it exits the box, but you split it into TWO 5" wide slots at the back of the box. Uhm, that totally changes your port area (doubles it). So who knows what your tuning is now.

Start over, that box is ruined. Get some help. But keep your chin up, shit happens.

Shit, didn't even notice that.

I still think he can do what I recommended above and see if that changes anything.

It's hard to recommend what to do without actually SEEING the enclosure. Who knows what else could be wrong with it.

 

[Chevyaudio 5,000+ posts]

Yeah man. Your best bet would be a rebuild. That box needs alot of help, and in my opinion it would be way easier to completely rebuild the box.

 

[aaron7114 10+ year member]

Your port is 5" wide as it exits the box, but you split it into TWO 5" wide slots at the back of the box. Uhm, that totally changes your port area (doubles it). So who knows what your tuning is now.

I dont guess I see what you are talking about. Can you explain it a little more?

 

[60ndown 10+ year member]

forget rebuilding it, your gettng good help here, if you are still not happy after you have tried eveything that gets sujjested here, THEN its time for a rebuild, im gonna bet you will get good results by messin with the port dimensions area and type (slot / aero)

maybe seal the box and run plasic pipe outside the box?

i haven't built a wall

yet //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[audioholic 5,000+ posts]

I dont guess I see what you are talking about. Can you explain it a little more?

At one end of your port it is 5" x 31.5", the other end of your port is actually TWO ends, both measuring 5" x 31.5". One end of your port has twice the port area as the other, due to splitting the port into two same size ports. In order to have maintained the same port area throughout the port length, the two split ports should have been 2.5" wide.

When you split that port into two ports, the port area is cumulative (must add them together for total port area). When that port splits, the subs have double the port area to 'breath' through. Since tuning is calculated using port area, and your's is inconsistent along the entire port length, tuning goes right out the window.

Hope that explains it better.

 

[60ndown 10+ year member]

At one end of your port it is 5" x 31.5", the other end of your port is actually TWO ends, both measuring 5" x 31.5". One end of your port has twice the port area as the other, due to splitting the port into two same size ports. In order to have maintained the same port area throughout the port length, the two split ports should have been 2.5" wide.
When you split that port into two ports, the port area is cumulative (must add them together for total port area). When that port splits, the subs have double the port area to 'breath' through. Since tuning is calculated using port area, and your's is inconsistent along the entire port length, tuning goes right out the window.

Hope that explains it better.

^ easy fix tho with some mdf and a saw right?

extend the port walls till there 2.5 inches from the back?

pita to acheive but doable.

 

[aaron7114 10+ year member]

Yeah I would really like to avoid doing a rebuild if I could. Maybe if I could just make some adjustments on the port? If there isn't a way to get good results out of this box I could make the box about 4 1/2" deeper. Really would like to avoid that too if I could...but i guess i gotta do whatever i gotta do.

Just trying to get all of this worked out before the comp on the 26th of this month.

edit: also the port is 30.5" not 31.5".

 

[audioholic 5,000+ posts]

^ easy fix tho with some mdf and a saw right?extend the port walls till there 2.5 inches from the back?

pita to acheive but doable.

Yes, certainly doable. But before Id do that, Id probably look into the idea of sealing the box and then adding the proper amount of round ports to acheive the goal he's after.

The reason I said scrap it, I guess Im a little more anal about getting internal volume and port size exactly the way I want in vented systems. Just making drastic changes like this on the fly are bound to run into compromises somewhere.

 

[audioholic 5,000+ posts]

Yeah I would really like to avoid doing a rebuild if I could. Maybe if I could just make some adjustments on the port? If there isn't a way to get good results out of this box I could make the box about 4 1/2" deeper. Really would like to avoid that too if I could...but i guess i gotta do whatever i gotta do.
Just trying to get all of this worked out before the comp on the 26th of this month.

edit: also the port is 30.5" not 31.5".

External Aero ports are all the rage these days in SPL anyway, modify the box to fit them if you want. *shrug*

 

[aaron7114 10+ year member]

External Aero ports are all the rage these days in SPL anyway, modify the box to fit them if you want. *shrug*

I would rather just make my own port instead of using aero ports. Maybe someone can figure up what my port needs to be.

 

[aaron7114 10+ year member]

so what should I do with the port? Anything I can do without a rebuild?