2 chambers, 2 ports, 1 sub PICS!!

[soloXgt 10+ year member]

gettin it loaded sat or sunday. Had a guy at work design and build this for me. All opinions are welcome. From what I am told, one port is tuned to 30hz and the other to 45hz When everything is hooked up, I'll let u guys know how it sounds. O yea, it was finished in bedliner. Opinions welcome....

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[SilverSquared 10+ year member]

2 difft tuned ports in 1 box?

 

[James Bang 5,000+ posts]

it is very difficult to understand the design of that box.

 

[revrider1 5,000+ posts]

**Confused**

Looks nice though

 

[soloXgt 10+ year member]

here is what it does/meens....i guess

http://images.google.com/imgres?imgurl=http://www.diysubwoofers.org/images/site/ported-dc.gif&imgrefurl=http://www.diysubwoofers.org/prt/dual_chamber.htm&h=164&w=72&sz=2&hl=en&start=14&um=1&tbnid=nw7SSsLocsv8ZM:&tbnh=98&tbnw=43&prev=/images%3Fq%3Ddual%2Bchamber%2Bported%26um%3D1%26hl%3Den%26rlz%3D1T4TSHB_enUS243US243%26sa%3DN

 

[bottlebaby 10+ year member]

looks sick hope it works as well as it looks

 

[BrianChia 10+ year member]

I really like the simplicity of porting in that design. As complex as it looks that is probably the simplest way to design/tune a dual chamber reflex box. Beautiful work. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[jake760 10+ year member]

So all 3 ports share the same dimensions and the difference in tuning is the result of different net volumes of the 2 chambers? Say a standard ported box for the sub needed 60sq" of port, would this box need 2 30sq" ports or 2 60sq"? Looks interesting!

 

[soloXgt 10+ year member]

i guess this is the reasoning behind this, based on the 35hz design, the tuning will fall between 30hz and somewhere around 45hz...with a pretty flat response (in car) between them....at the loudness of a 45hz or so tune, thats the goal." i'll only be giving it 1000watts when i get it in until i get the new amp

 

[Immacomputer 10+ year member]

i guess this is the reasoning behind this, based on the 35hz design, the tuning will fall between 30hz and somewhere around 45hz...with a pretty flat response (in car) between them....at the loudness of a 45hz or so tune, thats the goal." i'll only be giving it 1000watts when i get it in until i get the new amp

Yea, that's not what happens.

I have built two different enclosures just like this and the result was the same both times. There is no output benefit from the second tuning point. The upper tuning point really just creates a high pressure area behind the cone which limits excursion around the second tuning frequency. There won't be a significant increase in output there though.

The enclosure will mainly act like it is in an enclosure that has a volume equal to the smaller chamber and the larger chamber combined tuned to whatever frequency. The tuning frequency will come from the total port area on the outside and from the total volume of both chambers.

I hope it sounds nice as the construction looks pretty good.

 

[chinxtaboi 10+ year member]

wow, i totally dont understand this design. two diff ports to cover more range of frequency? im lost.

 

[vetkilr 10+ year member]

Yea, that's not what happens.
I have built two different enclosures just like this and the result was the same both times. There is no output benefit from the second tuning point. The upper tuning point really just creates a high pressure area behind the cone which limits excursion around the second tuning frequency. There won't be a significant increase in output there though.

The enclosure will mainly act like it is in an enclosure that has a volume equal to the smaller chamber and the larger chamber combined tuned to whatever frequency. The tuning frequency will come from the total port area on the outside and from the total volume of both chambers.

I hope it sounds nice as the construction looks pretty good.

An excursion limiting ported box

 

[mjf 10+ year member]

multiple tunings dont work well in regular ported boxes.

abc boxes yes, 6th+ orders yes

 

[soloXgt 10+ year member]

I don't understand it 100% either, but i like how it sounds.

Final install pics.....http://www.caraudio.com/forum/showthread.php?t=302362

 

[audioarsonal 10+ year member]

Its an ABC box.But the port set up doesn't look to be in the proper location.

Shouldn't both both chambers be ported seperately with a common port connecting the two?

I kinda see it in the pictures???