one 3" port?

[xluben 10+ year member]

i think two 4" ports will be a little much for 2cuft man..
exactly what i said about this box not being made for spl.

coming from the man with four 3" ports for two 15's //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

i have double that port area for two 12's.

try this:

http://www.carstereo.com/help/Articles.cfm?id=31

Driver Size (Inches): 12"Enter Quantity of Drivers: 1

Enter Xmax (mm): 13

Enter Tuning Frequency (Hertz): 32

Minimum Area: 22.79 in^2

which would be three 3" ports or two 4" ports

if you don't trust that, download winisd and learn how to use it.

also a common rule of thumb for spl applications is 16in^2 of port area per cubic foot of enclosure volume.

 

[Mr Bojangles 10+ year member]

coming from the man with four 3" ports for two 15's //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif
i have double that port area for two 12's.

http://www.carstereo.com/help/Articles.cfm?id=31

Driver Size (Inches): 12"

Enter Quantity of Drivers: 1

Enter Xmax (mm): 13

Enter Tuning Frequency (Hertz): 32

Minimum Area: 22.79 in^2

which would be three 3" ports or two 4" ports

if you don't trust that, download winisd and learn how to use it.

also a common rule of thumb for spl applications is 16in^2 of port area per cubic foot of enclosure volume.

Thought you were talkin about two 4" vented ports

 

[xluben 10+ year member]

Thought you were talkin about two 4" vented ports

what the hell are you talking about?

two (2), four (4) inch diameter, round ports, each 30" long.

in a 2 cubic foot (net) volume box, that is 32Hz tuning.

 

[jeremiah 10+ year member]

this is probably best/easiest for your situation:
http://www.subwoofertools.com/forum/ported-box.asp?Ew=40&Eh=13&Dia=6&Xmax=13&Vd=.045&NumW=1&Vb=2&Fb=32&Qts=&Vas=&Fs=&CE=0

more port area, slightly higher tuning, larger box volume.

(lower port air velocity, higher peak spl, flatter response)

how mane db's mor than the box I have

 

[Mr Bojangles 10+ year member]

if you do a long box like the one in the link you could probably handle the 30" length needed for a 32Hz tuning frequency( with two 4" ports).

thought u meant vented.

 

[xluben 10+ year member]

how mane db's mor than the box I have

you are both retarded, i'm going to bed

 

[Mr Bojangles 10+ year member]

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[jeremiah 10+ year member]

you are both retarded, i'm going to bed

me to //content.invisioncic.com/y282845/emoticons/zzzzz.gif.06fa1eabe00c8b872d7e814474c9b95c.gif//content.invisioncic.com/y282845/emoticons/drool.gif.b5e863e893038027711d4402f340dad0.gif

 

[helotaxi 5,000+ posts]

Vented = ported

However, audio terminology > you

/thread