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View Full Version : ? concerning dual ports for a single sub



theothermike
12-31-2006, 10:58 PM
well here the plan, i have a single 12" fi q, and ill be tuning around 28 - 30 hz. I have a big trunk car, and really want to take advantage of its width. so i was going for dimensions like 38.5 wide x 14.5 height x 15.5 - 16.5 width. now i really want to use this big width but i think it would look akward having a port on only one side and the sub far away. i was thinking of having my fi q centered and run 2 L ports to the front sides of the box

Something like you see with dual sub setups

Now here the ?
How would i go about figuring out how much width and length and area i would need of the port, i have single port plans of a 2.5 cu ft. box @ 30hz after displacements and stuff and i have a port area of 40, port length of 39 and port width of 3.25, how would i turn this into a dual L port design, im pretty sure you dont just divide by 2 :-).

would a maze port actually be better then an L port for going for a dual port on a single sub?

Help me out and guide me, if one of you guys wants to work on one, use the dimensions above

Mike-

PV Audio
12-31-2006, 11:26 PM
My only question is whether or not you want the dual port for anything besides aesthetics. Generally, if you paint the port properly and center the sub on the BAFFLE, then it looks quite nice.

Hintzyboy
12-31-2006, 11:31 PM
Can you increase the height at all? Maybe do a port that comes out the top or bottom of the front face in the middle.

Hintzyboy
12-31-2006, 11:32 PM
or port into the cabin so you don't see it from the trunk.

PV Audio
12-31-2006, 11:36 PM
Good suggestion.

(btw hintzy, I'm working on what you sent me).

Hintzyboy
12-31-2006, 11:36 PM
cool cool

theothermike
01-01-2007, 01:29 PM
only problem with port into cabin is my rear deck and my trunk lid closing bracket are sort of wierd and in the way. i have the bar that goes all the way across and moves up and down 1 inch. plus my height cant get any bigger for a port on the bottum. it is just for looks

Ill show pimp and see if it will be a big pain to do rear deck port but i dont think it'll happen.

Mike-

joetama
01-01-2007, 01:34 PM
I believe.... And I just woke up so I might be wrong that the port length is total vent area.

So, if to tune your box to 30 Hz if you had 40 SQ in of port and it was 12" long and you made that into two ports of 20SQ in they both would still be 12" long.....

I think.....

rpfuror
01-01-2007, 02:25 PM
Why not something like this. I have always like this design.
http://i135.photobucket.com/albums/q145/rpfuror/center_port.jpg

acold7dusta
01-01-2007, 02:31 PM
never seen that before^ pretty neat though

theothermike
01-01-2007, 02:39 PM
very neat indeed.

Mike-

can anyone confirm what B&W said

PowerNaudio
01-01-2007, 04:31 PM
Why not something like this. I have always like this design.
http://i135.photobucket.com/albums/q145/rpfuror/center_port.jpg

im running an enclosure similar to that in my car right now. lol

mine
http://img1.putfile.com/thumb/10/29417400369.jpg (http://www.putfile.com/pic.php?img=3776730)




and yes if you have a single port that is for example H:12" x W:4" L:20" you can convert that to a dual port by making it H:12" x W:2" x L:20" X 2 ports. it will maintain the same tuning.

theothermike
01-01-2007, 05:37 PM
well, thats the answer i needed. TY

Mike-

joetama
01-01-2007, 05:38 PM
W00t! I thought that was right....

But, wasn't sure, Wine gives you a bad feeling the next morning or well afternoon....

theothermike
01-01-2007, 05:47 PM
i cant seem to get a good single port design to work with to then convert it to a dual port. i guess i just have to do a single L port :-(.

Should you place the driver in the middle between the port and end wall or more toward the opposite end of the port?

Mike-

GemaRastem
01-01-2007, 06:08 PM
W00t! I thought that was right....

But, wasn't sure, Wine gives you a bad feeling the next morning or well afternoon....

I'll second that, I was dizzy and I swear the walls were moving.

joetama
01-01-2007, 06:30 PM
I'll second that, I was dizzy and I swear the walls were moving.

It doesn't give you a very good buzz either.... I had the crappy feeling of the buzz but not the good feeling... I was very unhappy.....

ngsm13
01-01-2007, 06:33 PM
Indeed.

nG

joetama
01-01-2007, 06:35 PM
Indeed.

nG


Now Jeger on the other hand.... Makes you fall at a party and not even remember it.... But you know you did fall because of the big bruise on your hip.... *Speaking from experience*

ngsm13
01-01-2007, 06:38 PM
I believe this is true.

Very true.

nG

joetama
01-01-2007, 06:58 PM
I believe this is true.

Very true.

nG


Bollocks to Jeger then...... But, it was still a good time....

wcarson8911
01-01-2007, 06:58 PM
i have a box similar to what you are talking about and i think it looks nice. It's 38 wide x 14 tall x 14.5 deep. here's a pic.

http://i61.photobucket.com/albums/h51/wcarson89/PB230042.jpg

ngsm13
01-01-2007, 07:02 PM
Oh, and it's Jaeger :fyi:

nG

joetama
01-01-2007, 07:05 PM
Oh, and it's Jaeger :fyi:

nG

My bad...

Noah = Spelling Nazi???


:eyebrow::naughty::uhoh:

theothermike
01-01-2007, 08:54 PM
how q sound at 30? is 2.2 to small in your opinion, would u like to have lets say 2.5?

Mike

also it doesn't look bad either

PowerNaudio
01-01-2007, 09:17 PM
38.5 wide x 14.5 height x 16.5 width - .75" of mdf you have a good: 4.175cuft to play with. so if you go with a 2.5cuft enclosure tune to 32Hz with 2 ports each port being 13" x 1.5" x 37.23" that will give you 39sqin of port area per port. more then enough to keep port noise down. and thats an even smaller enclosure 3.727cuft. so you still have room for sub displacement and lots of bracing to make the enclosure super solid.

matt_martin87
01-01-2007, 10:05 PM
how q sound at 30? is 2.2 to small in your opinion, would u like to have lets say 2.5?

Mike

also it doesn't look bad either

I have a Q at 30 hz in a 2.5cube box and I absolutely love the low end. I'm guessing it could be louder, but I would rather have it quieter up in the higher frequencies and dominate the lows.

iamamp3pimp
01-02-2007, 03:25 AM
well here the plan, i have a single 12" fi q, and ill be tuning around 28 - 30 hz. I have a big trunk car, and really want to take advantage of its width. so i was going for dimensions like 38.5 wide x 14.5 height x 15.5 - 16.5 width. now i really want to use this big width but i think it would look akward having a port on only one side and the sub far away. i was thinking of having my fi q centered and run 2 L ports to the front sides of the box

Something like you see with dual sub setups

Now here the ?
How would i go about figuring out how much width and length and area i would need of the port, i have single port plans of a 2.5 cu ft. box @ 30hz after displacements and stuff and i have a port area of 40, port length of 39 and port width of 3.25, how would i turn this into a dual L port design, im pretty sure you dont just divide by 2 :-).

would a maze port actually be better then an L port for going for a dual port on a single sub?

Help me out and guide me, if one of you guys wants to work on one, use the dimensions above

Mike-


tuning this isnt a problem for me duder.

I've done them before, and actually prefer them for single sub setups

theothermike
01-02-2007, 11:49 AM
well i wanted to get my plans, so you didnt have to use ur time :-), seeing how ur already doing alot, it one thing out of the way.

But if u insist and its your speciality pimp, sending pm right now.

Mike-