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View Full Version : \$2 paypal for legit answer!!

Ellsworthz
12-23-2008, 10:44 PM
need someone to figure out port length, reward will be \$2 paypal.

PM me answers, no ******* guessing assholes :)

http://i38.photobucket.com/albums/e127/ellsworthz/63c616ed.png

putting (2) 2" port (pvc pipe) on the bottom passenger side.

the box is 1.6^3 after displacements (other than the port obviously)

how long in inches will the pvc pipe need to be in the box?

Tuned to ~35hz

Ellsworthz
12-23-2008, 11:24 PM
bump come on people

12-23-2008, 11:29 PM

Louisiana_CRX
12-23-2008, 11:32 PM

:laugh:

99grandprixGT
12-23-2008, 11:33 PM
1 million

01 S 10
12-23-2008, 11:34 PM
7.29" each

Louisiana_CRX
12-23-2008, 11:34 PM
Do one 5" port 19" long

jdawg
12-23-2008, 11:38 PM
i get 6.76 long, am i doin it wrong? 1.6 and 1.572 after port displacements

SPLEclipse
12-23-2008, 11:40 PM
im slightly confused on how you got the ft^3 number. is that a 4" top and 7" bottom depth? here are my numbers based on 0.75 enclosure thickness:

gross volume: 1.114 ft^3
net volume (not including sub displacement but accounting for the port): 1.073 ft^3
port area (2" ports time 2): 6.283 in^2
port length: 11.387"

assuming that you had wwo of these enclosures with one 2" port per enclosure, then the port length would be 4.753"

so what is it?

mcsoul
12-23-2008, 11:41 PM
^^^^^what he said^^^^^

Your math is off, that box is 1.114 cubes with NO displacements assuming
the measurements are correct (40x14x4-d1x7-d2)

http://www.bcae1.com/spboxnew2.htm

http://www.viscerotica.net/pictures/commentary/fail_yoda.jpg

Tehgregzor
12-23-2008, 11:41 PM
is this a quiz or a real question?

BTW, its 6.75 inches.

jdawg
12-23-2008, 11:42 PM
whats your measurements ill try to whip up a box

edit- btw i was usin bb6 for the 1.6 cube ports

Ellsworthz
12-23-2008, 11:45 PM
I just used the Rockford fosgate measurement thing.

ok

14" tall, 40" long

bottom depth 7" top depth 4"

(2) 2" aero ports

tuned to 35hz

kentb
12-23-2008, 11:45 PM
4.5 inches

jdawg
12-23-2008, 11:46 PM
I just used the Rockford fosgate measurement thing.

ok

14" tall, 40" long

bottom depth 7" top depth 4"

(2) 2" aero ports

tuned to 35hz

you didnt say aeros, that makes a diff too (unless i missed it) but you sure on the 2"?

Ellsworthz
12-23-2008, 11:50 PM
you didnt say aeros, that makes a diff too (unless i missed it) but you sure on the 2"?

ok im using freaking pvc pipe, and i assume i need to use 2 2" ports because i dont think a single 4" one will fit on the side (i might be wrong)

jdawg
12-23-2008, 11:51 PM
dude thats a teeny box 1.06 after ports, 2 2" 12.77 long, hope its for 2 8's or something

Ellsworthz
12-23-2008, 11:52 PM
dude thats a teeny box 1.06 after ports, 2 2" 12.77 long, hope its for 2 8's or something

2 Sundown E8"s my friend :)

they suggest .6^3 ported each tuned to ~35hz

jdawg
12-23-2008, 11:53 PM
aeros add an inch so 11.77 long, 1 4 would be 24.31 long but it take up alot of displacement, brings it down to .916 after port, and you still have woofer displacement, actually i would need that to determine it correctly

KHARPS
12-23-2008, 11:54 PM
a pair of 2'' ports does not equal one 4'' port

radius squared * pie * # of ports = circular port area

1*1*3.14*2= 6.28 sq in for a pair of 2'' ports

2*2*3.14*1= 12.56 sq in for a single 4'' port

Theres a HUGE difference.

Ellsworthz
12-23-2008, 11:56 PM
aeros add an inch so 11.77 long, 1 4 would be 24.31 long but it take up alot of displacement, brings it down to .916 after port, and you still have woofer displacement, actually i would need that to determine it correctly

i couldnt find displacement anywhere, their only 4.25" depth

jdawg
12-23-2008, 11:56 PM
a pair of 2'' ports does not equal one 4'' port

who said it did

KHARPS
12-23-2008, 11:58 PM
ok im using freaking pvc pipe, and i assume i need to use 2 2" ports because i dont think a single 4" one will fit on the side (i might be wrong)

He never said they were the same...but I interpreted that he was implying they had the same amount of port area. Sorry Ellsworthz if I understood that wrong.

Ellsworthz
12-24-2008, 12:00 AM
He never said they were the same...but I interpreted that he was implying they had the same amount of port area. Sorry Ellsworthz if I understood that wrong.

I'm Confused :confused:

i just need teh inchez!

i could just do a 1" slot port, but i thought aeros going out the side would be more DBz than a slot port firing into the back of my seat :/

jdawg
12-24-2008, 12:01 AM
the volum of the box is 1.109, you aernt gonna have room, sure you cant go anymore heigth?

edit- with no ports

KHARPS
12-24-2008, 12:02 AM
I'm Confused :confused:

i just need teh inchez!

jdawg
12-24-2008, 12:03 AM
im goin by outside measurements btw, i figured you measured your space

Ellsworthz
12-24-2008, 12:03 AM

http://i48.photobucket.com/albums/f247/bboymecca11/christmas_thongs.jpg

KHARPS
12-24-2008, 12:04 AM
I'm Confused :confused:

i just need teh inchez!

i could just do a 1" slot port, but i thought aeros going out the side would be more DBz than a slot port firing into the back of my seat :/

Aeros are a great idea. But PVC is a lot different than aeroports. In my honest opinion, I don't think you'll have enough port area to keep port noise down. But I guess it all depends on how much power you're going to run. In my reg cab truck, I did a single 3'' aero in a 1.25 cube box and I got a lot of port noise...but I had 1000w on my sub. If you are running a low power application you might be able to get away with it.

Ellsworthz
12-24-2008, 12:06 AM
the volum of the box is 1.109, you aernt gonna have room, sure you cant go anymore heigth?

edit- with no ports

ahh, i belive i can go longer? i got an old pic of where the box will go.

http://i38.photobucket.com/albums/e127/ellsworthz/d9720888.jpg

i think 14" might be my max because of that dang plastic piece.

i think i can go about 50"-55" i just wanted to make a beauty panel on the side for the amp mounting.

Ellsworthz
12-24-2008, 12:08 AM
Aeros are a great idea. But PVC is a lot different than aeroports. In my honest opinion, I don't think you'll have enough port area to keep port noise down. But I guess it all depends on how much power you're going to run. In my reg cab truck, I did a single 3'' aero in a 1.25 cube box and I got a lot of port noise...but I had 1000w on my sub. If you are running a low power application you might be able to get away with it.

2 8"s roughly 250rms each. i dont think you will be able to hear port noise, with the speakers i have in there (i could be wrong)

jdawg
12-24-2008, 12:13 AM
47w would be 1.317 then 1.311 after port, im guess those 8's dont take up much, well actually they usaully include the woofer diaplacement so 46w would be 1.288 then 1.282 after port, thats pretty close

edit- with 4" pvc 18.7 long on the first and 19.2 on the second

Ellsworthz
12-24-2008, 12:22 AM
alright thanks