Subsonic filter of my amp

[DIGIDIGIBOMBO 10+ year member]

Hi i have a ts-w12prs sub, frequency range is 15-2000Hz, i instaled it in a ported box( vented box) is it the same?//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif Now my SSF is 15-40HZ i must use it eventhough my sub can handle 15Hz frequencies?? Its the tuning frequency of the box that is more important??:S i though that if the sub can handle low frequency as 15Hz well y not keep my SSF off at 15Hz. Would it be ok? Thx

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[tRiGgEr 5,000+ posts]

i instaled it in a ported box( vented box) is it the same?//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Yes

Now my SSF is 15-40HZ i must use it eventhough my sub can handle 15Hz frequencies??

Yes, just because your sub has a TS rating of 15-2000hz does not meen you should play those frequencies on it.

Its the tuning frequency of the box that is more important??:S

Yes, IIRC you set it a 1/4 octave below tunning.

i though that if the sub can handle low frequency as 15Hz well y not keep my SSF off at 15Hz. Would it be ok? Thx

No, set the SSF. What is the tunning of your box?

 

[DIGIDIGIBOMBO 10+ year member]

I calculated the tuning frequency of my box using a formula:

.159*sqrt((A*1.84*10^8)/(V*(L+.823*sqrt(A)))))

A = port area

V = volume of the box NET

L = port length

Someone posted it before and i got 22.642HZ:S so the SSF must be at 19?? the lowest or when turned off it is 15 HZ so i can turn it off? right?

A=6.2inch^2

V=2588.341"^3

L=19.685" those are the dimensions of my box

 

[LuNaTiC 10+ year member]

****, That's hella low tuning.

 

[DIGIDIGIBOMBO 10+ year member]

hella low? so where is the problem, could it damage the woofer? so where should my SSF level be tuned at???

 

[tRiGgEr 5,000+ posts]

I calculated the tuning frequency of my box using a formula: .159*sqrt((A*1.84*10^8)/(V*(L+.823*sqrt(A)))))

A = port area

V = volume of the box NET

L = port length

Someone posted it before and i got 22.642HZ:S so the SSF must be at 19?? the lowest or when turned off it is 15 HZ so i can turn it off? right?

A=6.2inch^2

V=2588.341"^3

L=19.685" those are the dimensions of my box

Do you seriously have a 2.8 inch circle port? If you do, what speaker were you using again? I can see port noise being a major problem.

Before adjusting your SSF I would take a look at the construction of the box. 1.5ft^3 that's good. But a tuning of 23hz? That is a bit low. Not a lot of music is recorded that low. And it is going to effect your output. My major concern is the port surface area. I would not even use a port that small with a low excursion 8" driver.

Also with your box tuned that low there would be no need to even use the SSF.

 

[DIGIDIGIBOMBO 10+ year member]

the port area is the area of the whole (void) where the air comes out of the box right?

Its a rectangle( 1.5"x4.133"), i am going to draw my box and attach a pic+dimensions

 

[tRiGgEr 5,000+ posts]

the port area is the area of the whole (void) where the air comes out of the box right?Its a rectangle( 1.5"x4.133"), i am going to draw my box and attach a pic+dimensions

Yep. That is an extremely small port. What driver are you using?

 

[RandyJ 10+ year member]

Also with your box tuned that low there would be no need to even use the SSF.

Twiced

And as far as the port noise, I wouldnt totally rebuild your box yet, try playing some music and see if noise becomes an issue, if it doesn then rebuild, but if it doesnt then there is no reason to waste the time and the money.

 

[DIGIDIGIBOMBO 10+ year member]

All dimensions are inner dimension and the thickness of the wood of this box is:

0.7"

I am using a 12" sub( Ts-w12prs), i dont have noise, sound is great....:S

What does it means the lowest the tuning freq of the box is? the lowet means more or less bass.....?? i dont know much about tuning freqand what do u mean by port noise?

 

[DIGIDIGIBOMBO 10+ year member]

So guys??

 

[DIGIDIGIBOMBO 10+ year member]

Many many guys are using the same box design as mine, alsmot all 12"subwoofer boxes are like that ( where i live). Also all of them are not using the SSF but i wanted to know if its a problem....?

 

[DIGIDIGIBOMBO 10+ year member]

oh well

 

[PhatTonyDeMarco 5,000+ posts]

What the hell kind of box is that?... Why is it shaped like that? I would rebuild entirely, scratch that octogan crap.

 

[DIGIDIGIBOMBO 10+ year member]

Here i am again, the port of my box os actually on the outside of the box, true the area of the port is 6.2"^2 kinda small but the port length is about 20" long. SO the volume of the port is what must be important, we could have a larger area but smaller length. Any thoughts of this design? I have a pioneer TS-W12PRS 12" sub, what must be the box volume?, port volume? lets say for 25Hz tuning frequency, although i dont know what it physically means( what is the sound difference between 25Hz or 37Hz box tuning frequency?),If i know the port volume i would pick any area and then compute to find the appropriate lenth or vis-versa true? Thx