question about a bandpass box. pics included

[danolimitpro 10+ year member]

well im trying to design a bandpass box for a friend and so far i got this

1.52 cubic ft. in the front sealed chamber.

2.56 cubic ft. in the rear ported area

the ports are the rear chamber are 3in. in diameter and will be 6.7in. long each.

now does this sound about right for this kind of a box or did i completely **** up

Click to read more...

 

[talon2nr7588 10+ year member]

what is the ported area tuned to?

 

[danolimitpro 10+ year member]

32 hz. is that good or should i go higher/lower

 

[btnhfan 5,000+ posts]

Why are you going with a bandpass?

 

[danolimitpro 10+ year member]

Why are you going with a bandpass?

its not me decision its my friends so i have no clue lol

 

[rpfuror 10+ year member]

Man, you build a bandpass box around driver parameters. Some drivers will work well and some with sound absolutely horrible depending on the passband and some will not work at all in the same box design.

Do you know the driver your friend is using?

 

[jdawg 5,000+ posts]

looks like a prefab you could buy for $50, I would do a little more reading bud

 

[danolimitpro 10+ year member]

Man, you build a bandpass box around driver parameters. Some drivers will work well and some with sound absolutely horrible depending on the passband and some will not work at all in the same box design.
Do you know the driver your friend is using?

spl ml-12

 

[jellyfish420 10+ year member]

Man, you build a bandpass box around driver parameters. Some drivers will work well and some with sound absolutely horrible depending on the passband and some will not work at all in the same box design.

x2

but either way, 32 is a bit low.

 

[rpfuror 10+ year member]

Actually those driver arn't that bad.

You really need to focus on a passband, but here would be some basic designs.

For a completely flat response (SQ): Passband = 35-94 Hz

Build For Each driver:

0.51 cu/ft Vented: Tuned to 58 Hz

0.76 cu/ft Sealed

For a 3db gain (SPL): Passband = 45-100 Hz

Build For Each driver:

0.51 cu/ft Vented : Tuned to 69 Hz

0.47 cu/ft Sealed

 

[rpfuror 10+ year member]

Here is a box with random dimensions designed around the drivers.

Passband = 35-94 Hz

 

[danolimitpro 10+ year member]

Here is a box with random dimensions designed around the drivers.
Passband = 35-94 Hz

can you throw me a cut sheet on that box. or do i gotta pay //content.invisioncic.com/y282845/emoticons/fro.gif.c695f1f814b01c4ad99fe7f8cccadd29.gif

 

[80INCHES 5,000+ posts]

ok um wow can some1 post a link for the subs used i never heard of them...i want to play around with t.hem i will start with .88 cubes sealed per sub playing into a common 2.5 cube ported area with a 70square inch port tuned to 60hz thtas going to be my starting point and i will tweek as time go along. now if i want something thats alittle less output i would start with 1.25 cube per sub playing into a common .90 cubes ported area tuned to 50hz with a 70square inch port. 80

 

[danolimitpro 10+ year member]

ok um wow can some1 post a link for the subs used i never heard of them...i want to play around with t.hem i will start with .88 cubes sealed per sub playing into a common 2.5 cube ported area with a 70square inch port tuned to 60hz thtas going to be my starting point and i will tweek as time go along. now if i want something thats alittle less output i would start with 1.25 cube per sub playing into a common .90 cubes ported area tuned to 50hz with a 70square inch port. 80

http://www.splusa.net/PDF/SPLWooferSpecs2003.pdf

that has the specs of the subs. the ml-12

if anyone wants to help design a box for me feel free. i would greatly appriciate it

 

[rpfuror 10+ year member]

^^^ The box above was design for those subs (based on the specs you just provided).... if you give me dimensions to work with I can build something that will perform better.