Ported for 12" Rlp

[flakko 1]

check out my plans:

i decided to go round port cuz one, its soo much easier to calculate and make, and 2 its easier to fire it into my cabin (the port will be positioned right underneath my first aid kit space).

the reason why the sub cutout is so high, is cuz i wanna make a false floor for the amps, and this way my sub box wont tip over

~2.0 tuned to 31 will be okay rite?

i need opinions

[ANeonRider 3]

How large of diameter of port will you be using? I would aim for something in the 4.5" - 5" range or 2-3".

2 ft^3 tuned to 31Hz will sound very good.

[flakko 1]

How large of diameter of port will you be using? I would aim for something in the 4.5" - 5" range or 2-3".

2 ft^3 tuned to 31Hz will sound very good.

<{POST_SNAPBACK}>

i was thinkin 2.5" for diameter

is the wider the better?

[ANeonRider 3]

Most definately.... (well to an extent of course)

A single 2.5" port would have horrible port noise.

Here is a decent thread to read:

http://www.soundsolutionsaudio.com/forum/i...?showtopic=2978

[flakko 1]

Most definately....

A single 2.5" port would have horrible port noise.

Here is a decent thread to read:

http://www.soundsolutionsaudio.com/forum/i...?showtopic=2978

<{POST_SNAPBACK}>

oo good stuff!

now the calculator i did this on says its only 5" long iz that normal?

[ANeonRider 3]

Here is the lengths you need for these diameters:

4" - 14.694"

4.5" - 19.00"

5" - 23.874"

(2) 3" - 18.073"

(2) 3.5" - 27.475"

http://www.the12volt.com/caraudio/boxcalcs.asp

[flakko 1]

Here is the lengths you need for these diameters:

4" - 14.694"

4.5" - 19.00"

5" - 23.874"

(2) 3" - 18.073"

(2) 3.5" - 27.475"

http://www.the12volt.com/caraudio/boxcalcs.asp

<{POST_SNAPBACK}>

ooo cool!

okay 2 mo questions and then i basically understand! sorry

1. using something like this: http://www.partsexpress.com/pe/showdetl.cf...tnumber=268-352 is like sticking it into a sealed box making it ported rite?

2. what is the optimal distance (inside the box) does there need to be between the port opening and a surface?? cuz the box i have rite now is 15.5" and i think im gonna have to use 2 ports cuz i don have enough room. Can i use 2 ports next to each other so it will split the length in half making it 2 7" long ports?

THanks soo much!

[swc204 0]

do these sound just as good as a slot port? or is there bunches of port noise?

[flakko 1]

do these sound just as good as a slot port? or is there bunches of port noise?

<{POST_SNAPBACK}>

after doin a lil reading... no audible difference.

[ANeonRider 3]

Round ports sound the same as slot ports, they do the same job.

Round ports don't need quite as much port area. (Less surface area = less friction = more velocity)

Slot ports are easier to integrate, but Round ports displace less airspace.

Now for flakko's q's....

Just adding a port to a sealed box isn't going to work if the sealed box doesn't have enough airspace. Best to design the box for the application.

Optimal distance is as much as you can give... but bare minimum is the width of the port, so if you have a 3" port diameter, then the port needs to be 3" from the nearest surface down from the opening.

Adding a second port will make the length needed longer, you cannot simply make a port that needs to be 14" long into two different ports of 7" long. In fact, in a 3" port's case (in a 2ft^3 tuned to 31Hz enclosure), a single 3" port will need to be 7.717" whereas two 3" ports needs to be 18.073".

Also... these lengths I give you apply to ports using PVC-type tubing with no flares, etc. Having flares will change the port lengths, and so will using an aeroport-type port.

[flakko 1]

umm so i was doin a lil more reading and calculating and

2 cubes after displacement,

3" wide port. 8" long. tuned to 31hz

funny. everything is exact lol

i guess there will be no port noise eh?

[flakko 1]

Round ports sound the same as slot ports, they do the same job.

Round ports don't need quite as much port area. (Less surface area = less friction = more velocity)

Slot ports are easier to integrate, but Round ports displace less airspace.

Now for flakko's q's....

Just adding a port to a sealed box isn't going to work if the sealed box doesn't have enough airspace. Best to design the box for the application.

Optimal distance is as much as you can give... but bare minimum is the width of the port, so if you have a 3" port diameter, then the port needs to be 3" from the nearest surface down from the opening.

Adding a second port will make the length needed longer, you cannot simply make a port that needs to be 14" long into two different ports of 7" long. In fact, in a 3" port's case (in a 2ft^3 tuned to 31Hz enclosure), a single 3" port will need to be 7.717" whereas two 3" ports needs to be 18.073".

Also... these lengths I give you apply to ports using PVC-type tubing with no flares, etc. Having flares will change the port lengths, and so will using an aeroport-type port.

<{POST_SNAPBACK}>

o_O wow 2 18" ports... okay ill just stick with a single 3"

and btw aneonrider.... thanks very very much for your help. i think ive made up my mind.

wait wait!!

noooooo!

im gonna use flareed ports!

[ANeonRider 3]

umm so i was doin a lil more reading and calculating and

2 cubes after displacement,

3" wide port. 8" long. tuned to 31hz

funny. everything is exact lol

i guess there will be no port noise eh?

<{POST_SNAPBACK}>

Again, not enough port area in a 3" port. Will cause lots of noise still.

A round port has a diameter, not a width.

[ANeonRider 3]

Here is the lengths you need for these diameters:

4" - 14.694"

4.5" - 19.00"

5" - 23.874"

(2) 3" - 18.073"

(2) 3.5" - 27.475"

http://www.the12volt.com/caraudio/boxcalcs.asp

<{POST_SNAPBACK}>

^Recommended port diameters

[flakko 1]

crap..... this is tougher than expected...

so when using flared the ports are shorter or longer?

and i am correct on the 2 18" long ports rite?

[Supa_c 1]

Longer

[ANeonRider 3]

Yes, you are correct about the 2-18" ports. I would personally go with the single 4.5" port.

[Supa_c 1]

I did dual 3" on my friends SE ( Ryans)

No port noise at all.

I dont remember anyone making 4.5" PVC

[ANeonRider 3]

OR... nearest size to that.

And yes, aeroports need to be longer... ~ 1" longer.

[flakko 1]

ooo the above 2 posts cleared a lot of things up for me.

i was plannin to port the bass into the cabin...

oh well... on they side they go mabye i can get a thing of plastic to guide the air into the cabin...

oh and supa.. yea thats rite. i was just thinkin about that box while thinkin about mine.

[ANeonRider 3]

Why not port to the cabin? Not enough space for the port to fit? You do have the space between the box and the rear deck, and well as the height of the box to fit the port...

[Supa_c 1]

You can just put part of the port in the enclosure and part of it in the cabin.

[Supa_c 1]

Aeroports are a pain to fit anywhere.

The stupid flanges are so massive

[flakko 1]

Why not port to the cabin? Not enough space for the port to fit? You do have the space between the box and the rear deck, and well as the height of the box to fit the port...

<{POST_SNAPBACK}>

hmm so i can extend the port outside of the box, like a iono parascope with no harmful side effects. i mite do that...

[ANeonRider 3]

Of course you can

The port acts the same in the box or outside of it.