can someone design me a box for free?

[bvr_j_0969 10+ year member]

like the title says could someone design me a ported box for 6 re 8's tuned to 30 hz?

its a truck wedge box i have all the deminsions i just cant find the port lengths

52" long, 10" bottom depth, 5" top depth, 21" tall i think the gross volume is 3.4 cft.

using 3 3" aero ports with flared ends. im not even sure i can get enough port volume with these ports for 6 ported?

subs specs .35 cft per sub ported subs displacement is .07 per sub.

i would like to use just 2 ports but not sure if i could get anywhere near the port volume i would need?

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[bvr_j_0969 10+ year member]

and i cant figure out the displacment for aero ports? if i could find the displacement of them i could figure the rest out

 

[Big Dee 10+ year member]

It's easy you just subtract the flares and then calculate the volume of a cylinder.

 

[bvr_j_0969 10+ year member]

It's easy you just subtract the flares and then calculate the volume of a cylinder.

but the flares take up displacement too? im trying to get this as acurate as possible, also i read in another thread searching, someone said the more ports the more spl?

 

[Big Dee 10+ year member]

The inner flare doesn't count I think?

The outer flares would take up so little space I probably wouldn't even count them.

As far as port area I would just worry about having enough so that you eliminate port noise.

 

[bvr_j_0969 10+ year member]

and im not sure on how much port area i would need for 6 re 8's also how much port area does 3 3" aero ports give me?

 

[Big Dee 10+ year member]

and im not sure on how much port area i would need for 6 re 8's also how much port area does 3 3" aero ports give me?

I'll model them in WinISD and see what kind of port velocity they make.

 

[Big Dee 10+ year member]

OK. I have them modeled, what frequency did you want it tuned to?

 

[OneKrazyKeebler 10+ year member]

The flares count 1" more lengthwise than regular length per flare. I dunno if it would make a noticable difference if you did anything more than that.

 

[bvr_j_0969 10+ year member]

30 hz

 

[Big Dee 10+ year member]

OK for a 30 Hz tune you would need 3 3" ports 25" long each. The inner volume would take up .307 square feet. Although someone might want to double check my math.

 

[bvr_j_0969 10+ year member]

according to every aero port calculator ive checked said somewhere between 19-20" port length but i dont know how accurate they are

 

[Big Dee 10+ year member]

Aeros don't make any difference compared to regular tubes, you just have to add an inch or so.

I actually calculated it wrong, it should actually be about 28" for a NET volume of 2.1 cu ft.

edit. I read your post wrong, I thought you said you have .35 for every driver.

For your box they should be about 20-21", my bad.

 

[dleccord 5,000+ posts]

why not use the one over at RE.com?

 

[bvr_j_0969 10+ year member]

i havnt built the box yet but each driver needs .35 per sub plus .07 per sub for driver displacement