PDA

View Full Version : ported box help



newb
12-22-2004, 10:37 AM
Im building a ported box for my 2 12w6v2's. I need help on using how many port tubes/pipes (however you want to call it) per sub and which diameter and length I should go with. I'm aiming more towards SQ with a little SPL.

Here are my options:

1. 3" Standard Port - 5" long
2. 4" Standard Port - 5" long
3. 3" Flared Port - 5" long
4. 4" Flared Port - 5" long
5. 3" Flared Port - 8" long
6. 4" Flared Port - 8" long

or recommend me other options I should go with. Thanks!

g30ffr3y
12-22-2004, 10:46 AM
Im building a ported box for my 2 12w6v2's. I need help on using how many port tubes/pipes (however you want to call it) per sub and which diameter and length I should go with. I'm aiming more towards SQ with a little SPL.

Here are my options:

1. 3" Standard Port - 5" long
2. 4" Standard Port - 5" long
3. 3" Flared Port - 5" long
4. 4" Flared Port - 5" long
5. 3" Flared Port - 8" long
6. 4" Flared Port - 8" long

or recommend me other options I should go with. Thanks!


the length and diameter of the round ports are determined
once you get the box volume all taken care of... i just built
a box with a round port... lots of folks on the forum will tell
you to make a vented box... which is a great option as it
allows for a bigger port and can eliminate the chance of port
noise... but my goal was to increase output and low end
"authority" while keeping a small enclosure... i succeeded
to my ears as now my single 12"SE sounds louder than
my previous dual 12" SE's sealed... *****in' i know!!!

having said that... a 4" port will help with port noise... but it
will have to be longer than a 3" port... depending on how
deep your box is i dont know if it will effect your decision...
i built a 2.1^3 box tuned to 32hz with a single 3" X 6.25"
circular port and i get little to no port noise... and certainly
nothing i can hear in the drivers seat of my car... there is also
the idea of multiple ports... say 3 3" diameter ports... while
this will pretty much eliminate port noise the ports will be
significantly longer thus forcing your box to be bigger for
a given internal volume after displacements...

ill stop there before i start rambling...

bcarpenterfhl
12-22-2004, 12:58 PM
imo you lose a lot of options and flexibility with rounded ports. i'd go with a slot.

DFW40
12-22-2004, 06:26 PM
Slots are great but can be a pain in the arse of you do not have precision cuts etc. It is easier to use pvc ports but it is harder to manage the length with them. I'd use pvc pipe if it were my first time.

g30ffr3y
12-22-2004, 06:36 PM
my first box was slot ported and since i did
all the cuts with a jigsaw and circular saw
i had quite a bit of "tweaking" to do to get
everything together...

my round port box was MUCH easier to build...

i took a risk with port noise... but everything came
out A-OK!!!

bcarpenterfhl
12-22-2004, 07:04 PM
i dont understand why people have such a hard time making straight cuts....its a no brainer with a table saw, and if you only have a circular saw you just clamp down a 2 by 4 as a quite and youll get good cuts.

newb
12-23-2004, 02:35 AM
Thanks. I will test things out and see how it goes as this is my first time. Any tips/advice before I start this project??

g30ffr3y
12-23-2004, 10:28 AM
i dont understand why people have such a hard time making straight cuts....its a no brainer with a table saw, and if you only have a circular saw you just clamp down a 2 by 4 as a quite and youll get good cuts.



i hope to get a table saw after christmas... my cuts are pretty darn
accurate for a skill saw... but even pretty accurate can turn into
way off when your trying to put together all the sides of a vented
box...