Poorly designed 4th order

[RangerDangerV2 5,000+ posts]

And if you are wondering why I had so much rise, it was a 5:1 4th with 113in^2 of port area, it was ridiculously efficient.

 

[4bannger 10+ year member]

And if you are wondering why I had so much rise, it was a 5:1 4th with 113in^2 of port area, it was ridiculously efficient.

Didn't know this would become an argument lmao.

 

[Jes 42 10+ year member]

Didn't know this would become an argument lmao.

It's ca.com

 

[Beatin' 10+ year member]

So your saying that if i make 4 cubes sealed and since i have to divide the chamber each sub would get 2 cubes, and then a 4 cube ported section?

yes

 

[hispls 5,000+ posts]

And if you are wondering why I had so much rise, it was a 5:1 4th with 113in^2 of port area, it was ridiculously efficient.

Just setting the record straight that you were essentially running 4K

 

[4bannger 10+ year member]

yes

so the 1:1 ratio isnt the problem it was the amount of space i was using? would i be better off doing a ported box as far as it being louder?

 

[dbeez 5,000+ posts]

yes overall the box is way too large I would have went with something like 1:1.5 basically 4 sealed and 6 cubes ported tuned around 60hz should do nice but I am not a 4th order king just done a ton of reading and from my understanding the larger the ratio the larger and faster the roll off is basically becoming a 1 note wonder now a ported box will get the job done but if ya want something different a 4th order can be real nice and impressive. you also have to be real careful on the port area it cant be real large.

 

[4bannger 10+ year member]

yes overall the box is way too large I would have went with something like 1:1.5 basically 4 sealed and 6 cubes ported tuned around 60hz should do nice but I am not a 4th order king just done a ton of reading and from my understanding the larger the ratio the larger and faster the roll off is basically becoming a 1 note wonder now a ported box will get the job done but if ya want something different a 4th order can be real nice and impressive. you also have to be real careful on the port area it cant be real large.

what kind of port area should i shoot for? im still undecided if i wanna go with a 4th or ported for my next box build

 

[dbeez 5,000+ posts]

From my understanding is 1/2 your cone area

 

[Notloud00 10+ year member]

what kind of port area should i shoot for? im still undecided if i wanna go with a 4th or ported for my next box build

You wont know until you build it. I would build a sealed box with a qtc of .707, find the resonance, do a 1:3 ratio ratio and use 1/2 cone area amount of port area tuned to the sealed resonance and just see how it sounds. To peaky, shrink the front, doesnt play low enough, tune the port lower, isnt loud enough, up the port area, subs unload to easy, make a loading wall. Once boxes are in the car its all testing, why do you think all the big 4th order builds have multiple test vids with no port and differnt ports? Its all about testing. Just make it to where the front can be totally changed and just goof with it.

Thats what it is all about lol

 

[SounDrive Pro Seller]

1. Get your sealed Fc around 45-55 (depending on goals)

2. Tune to or around Fc

3. 2:1 or higher ratio for output, 1.5ish or less if you don't care if you lose a dB or two

40Hz is just too low for a 4th order, plus your ratio was too small. If you don't know what you're doing, a ported box is a lot easier to get right

 

[4bannger 10+ year member]

1. Get your sealed Fc around 45-55 (depending on goals)2. Tune to or around Fc

3. 2:1 or higher ratio for output, 1.5ish or less if you don't care if you lose a dB or two

40Hz is just too low for a 4th order, plus your ratio was too small. If you don't know what you're doing, a ported box is a lot easier to get right

Well i was thinking about just going with a ported box. I've mad a few designs can you tell me if any of these would be a good design for a ported box?

-I'm not sure how good down-fire boxes work so this is just a concept for a box. is there any special things that a down-fire box needs different than a ported?

View attachment 26548276View attachment 26548277View attachment 26548280

-This is a ported box i was thinking about. The angled piece on the top is just a concept of an amp rack with plexi glass and the holes in the back are for cooling fans.

View attachment 26548281View attachment 26548282View attachment 26548283

 

[RangerDangerV2 5,000+ posts]

Just setting the record straight that you were essentially running 4K

yeah? so are you trying to say that my woofers were actually getting 4kw? No, they were not. I would think that you of all people would understand this.

 

[hispls 5,000+ posts]

yeah? so are you trying to say that my woofers were actually getting 4kw? No, they were not. I would think that you of all people would understand this.

I understand, but your claim is a bit misleading and you know it.

 

[4bannger 10+ year member]

yeah? so are you trying to say that my woofers were actually getting 4kw? No, they were not. I would think that you of all people would understand this.

I understand, but your claim is a bit misleading and you know it.

more help less argue please