whats this tuned to?

[rollerdj 10+ year member]

got a pair of boxes. 9 cubes. 2 ports that are 2.5" round and 5" deep. i have no clue what it is tuned to, but i'm sure its way to high. thanks.

Click to read more...

 

[Immacomputer 10+ year member]

Umm.. it's tuned close to 20hz actually. It has very little port area and any sub that would sit well in 9 cubes is going to have pretty horrible output and probably a lot of port noise.

 

[rollerdj 10+ year member]

Umm.. it's tuned close to 20hz actually. It has very little port area and any sub that would sit well in 9 cubes is going to have pretty horrible output and probably a lot of port noise.

no port noise. but, HORRIBLE output. the only time i've ever heard these things come alive is playing a song by busta ryhmes that happend to have a really high bass line ("give me some more") the ports so close to the edge that i'll have to stay with 2.5. so all i need to do is cut a little off the ports then. off to the box building wizard it is.

 

[Immacomputer 10+ year member]

What are the exact dimensions of the enclosure? Outside and inside would be nice.

You will really benefit from more port area so cutting those down probably won't help you much at all.

 

[rollerdj 10+ year member]

external size is 20X20X41. internal is 17.5X17.5X38.5. i was thinking that cutting the port shorter was kinda odd after i thought about it. i'll have to take one back to the shop at work and do some more measuring. what size port do u think i should do?

 

[Immacomputer 10+ year member]

What sub(s) and how many? Also, that enclosure is only about 6.5 cubes, not 9.

 

[rollerdj 10+ year member]

What sub(s) and how many? Also, that enclosure is only about 6.5 cubes, not 9.

oops. did the math wrong. kinda no name subs. i found em at a pawn shop (i know, i know) for work. i think they are about 3, 400w rms. they are dual 15"s though. i'm hoping to just add some bass till i can get the big set of woofers it. (a pair of dual 18" yama's that take over 3,400w rms) //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif:yumyum:

 

[Immacomputer 10+ year member]

I would do two 6" PVC ports about 14" long each. That should tune it to about 35hz. Or you could do 4 4" PVC ports about 14.25" long each for roughly the same tuning.

 

[rollerdj 10+ year member]

for ease of moding. could i do 1 6" at 28" long, or would that not work?

 

[Immacomputer 10+ year member]

No, that wouldn't work at all and it would tune it to 18hz. If you could get your hands on some 8" PVC, you could do one 8" at 12" and that should be pretty decent.

Why would putting two 6" ports in be difficult?

 

[rollerdj 10+ year member]

getting a 10' X 6" pipe in my car isn't going to happen //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif i did the 4" instead since it came in 5' sections. allso, while i was working on one of em i found the name plate. offical power handling is for the pair 400 max. so, if i'm thinking right, (feel free to correct me if i'm wrong) that means each sub is 200 max, or roughly 80 / 100 rms. no wonder once i hung them in the air they just died and had little sound. so i ordered a pair of the fosgate subs t3audio_160sdbjeep has up for sale. i remeber having those in the back of my explorer. man they sounded good. so they should be a huge improvment over what was in there.

 

[Immacomputer 10+ year member]

Well that's good you got it worked out but Home Depot and Lowes will cut PVC down to your exact measurements and you only pay for what you take. Just for future reference.

 

[rollerdj 10+ year member]

i'll have to remeber that. i went to manards since they are on the way to work. thanks. i'll make sure to post up some pic's when it's all done for ya'll