Let the box building begin...PICS

[tommyk90 5,000+ posts]

the speaker doesn't realize its even in an enclosure, the speaker mearly reacts to the new environment the best way it can, it reacts to the current being applied by the amplifier and it reacts in the enclosure its in, the sub will not even see the second chamber, the only reason i called it a second chamber was to help explain but its not a secondary chamber and the air wont flow in to the second chamber the subwoofer will pressurize the enclosure including the second chamber, and pressurized air will be forced out the port like it was planed. with out the light blue piece the port will just get shortened and not only increase the enclosure volume seen by the sub, but it will also increase the enclosure tuning.

The air isn't going to have a chance to flow EFFICIENTLY through that 2nd chamber because the port opening is ABOVE that 2nd chamber.

The air pressure is going to find the easiest and quickest way out of the box, in this case the port, and not even pressurize that other chamber. It's going to throw tuning WAY off because of the much smaller airspace the sub is going to THINK it's in.

If you wanted to make it a little better, I would have made the port NOT go across the whole width of the box. Cut down on port area, somewhere around 35-40 square inches would be more than good enough. This would allow the port to be shorter and maintain the same tuning, and wouldn't have that disgusting labyrinth of a port.

This reminds me of chevyaudio's box that he made. He had a real skinny truck box with internal aeros. Even though the box was ~ 2 cubes, the internal aeros were in a large section of the box, thus not letting air pressurize the air AROUND the ports. Instead, the air flowed OUT of the ports, and his peak frequency was sky high because of this.

 

[slikrider20 10+ year member]

Yeah, but you draw me up a design on how to make the port only say half way across the width of the box and i'll be surprised.

 

[PowerNaudio 10+ year member]

The air isn't going to have a chance to flow EFFICIENTLY through that 2nd chamber because the port opening is ABOVE that 2nd chamber.
The air pressure is going to find the easiest and quickest way out of the box, in this case the port, and not even pressurize that other chamber. It's going to throw tuning WAY off because of the much smaller airspace the sub is going to THINK it's in.

If you wanted to make it a little better, I would have made the port NOT go across the whole width of the box. Cut down on port area, somewhere around 35-40 square inches would be more than good enough. This would allow the port to be shorter and maintain the same tuning, and wouldn't have that disgusting labyrinth of a port.

thats wrong and it makes no sence, air finds its way out by going toward the lowest presure point, but only when its forced out. which means it will fill everything up before it goes out the leak. which on a ported enclosure will be the port.

 

[baseballer1100 5,000+ posts]

So any pics of the build?

 

[tommyk90 5,000+ posts]

thats wrong and it makes no sence, air finds its way out by going toward the lowest presure point, but only when its forced out. which means it will fill everything up before it goes out the leak. which on a ported enclosure will be the port.

Wrong, just wrong.

What do you think is going to have less pressure? An enclosed space OR A BIG HOLE IN THE BOX?!?!

Are you seriously that dense or do you just not want to admit that you f*cked up that design?

The air isn't even going to get a chance to pressurize that airspace. I ran into a similar problem with a truck box I made for myself. Because of the way the port was laid out, and since it was a big L-port, it cut off airflow to a large chamber of the box and jacked up my tuning big time.

It's the KISS principle. Keep It Simple Stupid. And that box is far from it.

 

[PowerNaudio 10+ year member]

Wrong, just wrong.
What do you think is going to have less pressure? An enclosed space OR A BIG HOLE IN THE BOX?!?!

Are you seriously that dense or do you just not want to admit that you f*cked up that design?

The air isn't even going to get a chance to pressurize that airspace. I ran into a similar problem with a truck box I made for myself. Because of the way the port was laid out, and since it was a big L-port, it cut off a large chamber of the box and jacked up my tuning big time.

It's the KISS principle. Keep It Simple Stupid.

if i had ****ed up the design i wouldnt had given it to him.

we went trough so many diffrent enclosures till we got to this one.

there is no reason this wont work.

and your resoning behind the why it wont work doesnt make sence.

so look over the design some more and find some thing else to critize.

 

[PV Audio 5,000+ posts]

the speaker doesn't realize its even in an enclosure, the speaker mearly reacts to the new environment the best way it can, it reacts to the current being applied by the amplifier and it reacts in the enclosure its in, the sub will not even see the second chamber, the only reason i called it a second chamber was to help explain but its not a secondary chamber and the air wont flow in to the second chamber the subwoofer will pressurize the enclosure including the second chamber, and pressurized air will be forced out the port like it was planed. with out the light blue piece the port will just get shortened and not only increase the enclosure volume seen by the sub, but it will also increase the enclosure tuning.

Really. Okay, then in that case, consider this:These are two completely theoretical drawings. Let's assume that they both have the exact same interior space, and exact same port length, and exact same driver.



Here is your standard ported enclosure. You have a full idea how the speaker will perform.



This is the equivalent to your design. Note the separate chambers, but the total interior space without the port length on the end is the same as the previous one. Now, are you honestly telling me that the speaker will utilize the airspace in those chambers even though that passage on the bottom is maybe 2" high, and that it'll behave the same since it "pressurizes" all of the airspace and all airflow will go out the port?

 

[slikrider20 10+ year member]

So any pics of the build?

No, i'm leaving in abouty a half hour to start it. I'll have them up tonight. I'm just going to make it as designed and we'll see what happens.

 

[nismos14 5,000+ posts]

Let the dude build it and tell us how it sounds, end of story.

 

[baseballer1100 5,000+ posts]

No, i'm leaving in abouty a half hour to start it. I'll have them up tonight. I'm just going to make it as designed and we'll see what happens.

sweet.

 

[slikrider20 10+ year member]

Let the dude build it and tell us how it sounds, end of story.

Thats what's going to happen. But i like hearing this guys debate, that way after its built one of them will look stupid.

And i won't be able to tell you guys how it sounds for awhile. My friend is buying my Mag on Sunday, and at that time i will order my 15" Q. And even then i have to wait for my nine.1 to get back.

 

[baseballer1100 5,000+ posts]

Thats what's going to happen. But i like hearing this guys debate, that way after its built one of them will look stupid.
And i won't be able to tell you guys how it sounds for awhile. My friend is buying my Mag on Sunday, and at that time i will order my 15" Q. And even then i have to wait for my nine.1 to get back.

Thats too long. lol

 

[slikrider20 10+ year member]

Thats too long. lol

Yeah, your tellin me. And i won't be exactly happy if i wait that long, go through all this work. And have it sound like a$$. At that time i will probably retire from car audio.

 

[PV Audio 5,000+ posts]

Thats what's going to happen. But i like hearing this guys debate, that way after its built one of them will look stupid.
And i won't be able to tell you guys how it sounds for awhile. My friend is buying my Mag on Sunday, and at that time i will order my 15" Q. And even then i have to wait for my nine.1 to get back.

No one is going to look stupid, since you cannot possibly know what it's going to sound like. I never said it will sound bad, I said that you can't even know what it's tuned to since you have a random chamber just chillin in the bottom of the box.

 

[slikrider20 10+ year member]

No one is going to look stupid, since you cannot possibly know what it's going to sound like. I never said it will sound bad, I said that you can't even know what it's tuned to since you have a random chamber just chillin in the bottom of the box.

I think i'll be able to tell how it sounds when i have it hooked up.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

And to be quite honest with you, i don't give a flying fu