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DonH
11-26-2008, 01:54 AM
so i have designed a new box for my truck because firing up just sounds utterly terrible! here is what ive got so far. oh yeah cerwin vega HED's which call for about 1.4 each so should be a nice fit. there not spl subs so dont flame me haha... so here the box
external measurements
w- 42"
H- 11.5"
D- 18"

with an internal volume of about 2.8ft^3 but w/out vent 3.03ft^3

i have decided to port it to 33 hz the vent measures


w- 8"
H- 2"
D- 8.77"
please help if i am wrong on this PLEASE HELP! first time porting!
which will give me 33 hz right?

well n e way's heres a pic of the box
will post more upon request for relevant questions pertaining to diff. views

http://img243.imageshack.us/img243/2401/downfirerealua8.png (http://imageshack.us)
http://img243.imageshack.us/img243/downfirerealua8.png/1/w640.png (http://g.imageshack.us/img243/downfirerealua8.png/1/)


thanks alot!

DonH
11-26-2008, 02:01 AM
sry they are 12's

slam
11-26-2008, 02:03 AM
id have the port down too... but thats me

DonH
11-26-2008, 02:06 AM
really.... i must say that did cross my mind but is that a right size port for the tuning freq.? i have never built a ported enclosure

slam
11-26-2008, 02:13 AM
from my calculation it looks like it needs to be
h 8
w 2
d 9.8

d= depth

but dont count me to be right on

UCF_Knight24
11-26-2008, 02:43 AM
so i have designed a new box for my truck because firing up just sounds utterly terrible!

I hope that's not the case when I build my box in my Ranger. I was planning on going subs up, port up.

bryce-man
11-26-2008, 02:53 AM
ive always done subs slanted with the back of the seat.. but have never gone ported :/
my next box will be slanted with seats and ported to passenger side, or a semi wall with 4 15's tuned to 30 hz :D
and im pretty sure you need more port area wich means bigger box if you want to stay with 1.4ft^3 per sub
and fyi you can go alot wide than 40
since you cant use the jumpseats with the box you have planned. why not take em out?
boom, instant 10+ inches

DonH
11-26-2008, 02:41 PM
I hope that's not the case when I build my box in my Ranger. I was planning on going subs up, port up.

i just could not stand the sound! i had a box firing the subs into the font seats first then the sub up set-up and just was not cutt'n it! could be my ear but i think sub up *****! let me know how yours goes!

DonH
11-26-2008, 02:42 PM
ive always done subs slanted with the back of the seat.. but have never gone ported :/
my next box will be slanted with seats and ported to passenger side, or a semi wall with 4 15's tuned to 30 hz :D
and im pretty sure you need more port area wich means bigger box if you want to stay with 1.4ft^3 per sub
and fyi you can go alot wide than 40
since you cant use the jumpseats with the box you have planned. why not take em out?
boom, instant 10+ inches

Extra work! haha! but i really dont want to take em out just because! plus with that box i can get away with 1 sheet of mdf!

DonH
11-26-2008, 02:44 PM
from my calculation it looks like it needs to be
h 8
w 2
d 9.8

d= depth

but dont count me to be right on

aw crap! ur right it should be 9.8! haha i calculated it off of 3.03 Ft^3 instead of the actuall internal volume haha thx thou!

DonH
11-26-2008, 07:42 PM
alright so i have the final design painted an all on sketchup with a rough sketch of the back of the truck as you can c i have moved the port to fire down. it is in the middle of the subs 33 hz. im going to hopefully start the build this sat. putting in two cerwin-fega HED 12.4 ran off of a fusion PPam2000.1 wired to 1 ohm

heres a view of the bottom with the port
http://img140.imageshack.us/img140/6674/47022040la0.png (http://imageshack.us)
http://img140.imageshack.us/img140/47022040la0.png/1/w640.png (http://g.imageshack.us/img140/47022040la0.png/1/)

and with the seat and amp rack on top didnt feel like making the passenger seat

http://img354.imageshack.us/img354/3606/seatfinalmk4.png (http://imageshack.us)
http://img354.imageshack.us/img354/seatfinalmk4.png/1/w640.png (http://g.imageshack.us/img354/seatfinalmk4.png/1/)

Lakota
11-26-2008, 08:29 PM
Do not do subs up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Lakota
11-26-2008, 08:31 PM
Subs up is a full dB quieter than subs forward.

Rashaddd
11-26-2008, 08:32 PM
I really hope that little slit in the box isn't the port

you need at LEAST about double that port area, really you should have 3 or 4 times as much

DonH
11-26-2008, 08:40 PM
Do not do subs up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


I really hope that little slit in the box isn't the port

you need at LEAST about double that port area, really you should half 3 or 4 times as much

Lakota, its subs down man. SUBS down. and Rashaddd so wut would be a decent amount of port area? ive got alot of room to work with so let me no please!

bunkerking09
11-26-2008, 08:44 PM
port area for those...i'd go with 75-85 square inches.

i'm the ranger box god...trust me ;)

Lakota
11-26-2008, 08:54 PM
Lakota, its subs down man. SUBS down. and Rashaddd so wut would be a decent amount of port area? ive got alot of room to work with so let me no please!

:)

4 4" or 2 6" aero's would work nicely. You even have the room to run them external. If you want to go with a slot port, I'd do at least 70 sq in. My truck LOVES port area.

Rashaddd
11-26-2008, 08:55 PM
port area for those...i'd go with 75-85 square inches.

i'm the ranger box god...trust me ;)

this

bunkerking09
11-26-2008, 08:57 PM
if you end up running aero ports internal be sure to keep them at least 4-5 inches away from all walls

Kenneth10483
11-26-2008, 09:57 PM
Do not do subs up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Thats funny with my friends mazda truck it was the other way around was louder subs up the forward 2 Mojo 15s in a 5.3 cubic foot box with 4 external ports facing the drivers side did a 156.8........... guess it depends on other things!

DonH
11-26-2008, 10:13 PM
Thats funny with my friends mazda truck it was the other way around was louder subs up the forward 2 Mojo 15s in a 5.3 cubic foot box with 4 external ports facing the drivers side did a 156.8........... guess it depends on other things!

i guess cuz my old box i ripped out with authority was subs up actually partially slanted SOUNDED UTTERLY HORRID! sux that was my first box i built to!

DonH
11-26-2008, 10:14 PM
:)

4 4" or 2 6" aero's would work nicely. You even have the room to run them external. If you want to go with a slot port, I'd do at least 70 sq in. My truck LOVES port area.

where can i get sum aero's cuz thoze things look nice. or could i make my own out of abs?

Lakota
11-26-2008, 10:46 PM
Thats funny with my friends mazda truck it was the other way around was louder subs up the forward 2 Mojo 15s in a 5.3 cubic foot box with 4 external ports facing the drivers side did a 156.8........... guess it depends on other things!

Most of the trucks I've seen are louder with subs forward. Then again, it can depend on meter placement and other factors. I typically meter at the headrest, and I'm louder with the subs forward. But, I do pretty much the same score in the kick whether the subs are forward or up.

Lakota
11-26-2008, 10:47 PM
where can i get sum aero's cuz thoze things look nice. or could i make my own out of abs?

You can make your own or buy them off of partsexpress.com

91Chevy
11-26-2008, 11:10 PM
Subs up is a full dB quieter than subs forward.

OH MY GOD PANIC, IT'S THE END OF THE FREAKING WORLD, AN ENTIRE DECIBEL LOWER!!!!:eek:

Lakota
11-26-2008, 11:19 PM
OH MY GOD PANIC, IT'S THE END OF THE FREAKING WORLD, AN ENTIRE DECIBEL LOWER!!!!:eek:

I did get a little excessive with the exclamation marks:) A dB is quite a big difference, especially when you get into the 150's. People would get a lot more sound out of their cars if they spent more time learning their car.

DonH
11-27-2008, 01:47 AM
k so if i do 4 aero 4" aeros how long would each have to be? and does the flare really help.

Lakota
11-27-2008, 11:40 AM
k so if i do 4 aero 4" aeros how long would each have to be? and does the flare really help.

There's a tuning calculator on psp-inc.com

The calculator will tell you the length that each aero must be. The more ports that you add, the longer they must be. If you don't like the way that the tuning sounds, you could always simply change the port length:) Yes, the flares do help.

DonH
11-27-2008, 01:45 PM
There's a tuning calculator on psp-inc.com

The calculator will tell you the length that each aero must be. The more ports that you add, the longer they must be. If you don't like the way that the tuning sounds, you could always simply change the port length:) Yes, the flares do help.

thx so i did the calculator put everything in for 4 4" aeros it gave me 42.50 overall length... so i divide that by 4 correct to give me 10.650" there for each flared port will be that length. so with the length of my box i can port them to the sides but not down will that affect n e thing?

DonH
11-27-2008, 03:00 PM
ok so i have decided to make my own aeros since its cheaper! had to pay sum bills i forgot about. i have 4 inch pvc laying around so i have the box tuned to 35 hz with four 4" ports measuring 9.14" each with total length of 36.57".

here is a pic of the box

http://img266.imageshack.us/img266/4926/finalwithaeroportsgp5.png (http://imageshack.us)
http://img266.imageshack.us/img266/finalwithaeroportsgp5.png/1/w640.png (http://g.imageshack.us/img266/finalwithaeroportsgp5.png/1/)

DonH
11-28-2008, 01:29 PM
does anyone disagree with making your own aeroports?

hatemonger
11-28-2008, 01:34 PM
does anyone disagree with making your own aeroports?

you can. flared aero's however, is how you get away with having to little port area. you can do around 1/2 the port area as a slot port, as a general rule.

DonH
11-28-2008, 04:44 PM
so if i wanted to make my own would 4 4" pvc ports work just as fine as 4 4" flared aeroports

DonH
11-28-2008, 08:43 PM
alright so im not going with the aeros. i just cut the pieces to my box and wow i have alot of extra wood! so im going vented so would 50 square inches of port do? with more port area does that mean less port noise?

Rashaddd
11-28-2008, 08:49 PM
alright so im not going with the aeros. i just cut the pieces to my box and wow i have alot of extra wood! so im going vented so would 50 square inches of port do? with more port area does that mean less port noise?

50 should be fine

DonH
11-28-2008, 09:14 PM
50 should be fine

ight sweet! should start the build tom. thx for the help oh and i jizzed up on the internal volume of me box! its actually 3.8 ft^3 i measured the internal dimensions at

w 40.5"
l 16.5"
h 10"

which is 3.8 ft^3 right! god i hope so. im just erasing having wood thickness right since its the measurements of the inside of the box. hope that works

Rashaddd
11-28-2008, 09:15 PM
the port will take up space too, and doesn't count when you talk about net volume (the volume that matters)

DonH
11-28-2008, 09:21 PM
ok so i want my box tuned to 33hz so i went to carstereo.com. i want two 5x5 ports. put everything in the calculator and got 25.93 so i divide that by two to get the length of each port right

DonH
11-29-2008, 03:02 AM
k for now since i cant stand having no bass ima just build the box sealed then in about a week gona throw in 4 aeros from parts express. thx for all the help yall and the post above is totally irrelevant! dont read. thx to all for all the advice!


edit: anyone say no the keeping this sealed? should i go smaller?

DonH
11-30-2008, 03:00 AM
is 2.8 cubes to big for a sealed enclosure