View Full Version : Port Distance From Side and Bottom

08-03-2005, 11:34 PM
Hey, i did try :search: before typing this but didnt find anything. For a tube port, how much distance do i need from the side and the bottom, it is a 4" port and 10.25" long.

Mr. Opportunist
08-03-2005, 11:37 PM
put it wherever it fits....

08-03-2005, 11:39 PM
So it doesnt have to be any certain distance from the side wall and bottom wall? Or can it be flush against it?

08-03-2005, 11:46 PM
So it doesnt have to be any certain distance from the side wall and bottom wall? Or can it be flush against it?

If it was flush against it that would nearly completely defeat the purpose of the port. It depends on the size of it, but I would say 2-4 inches.

Mr. Opportunist
08-03-2005, 11:49 PM
i think he means flush with the front, if so thats fine.

08-04-2005, 12:16 AM
Ok, so 2-4 inches from side and bottom, sounds good. One more thing, what do i use inside the box to brace the port? Just a piece of wood with a curve cut into it like this?

08-04-2005, 12:18 AM
Dude, start over. Describe your box in it's entirety, and then ask us a question. You'd be golden.

08-04-2005, 12:21 AM
lol i dont have it planned out yet, i just wanna know how to brace the port now, unless i just glue the port into the hole and just leave it there.

SSS 18734
08-04-2005, 12:24 AM
you dont have to brace the port. just make sure the hole you cut for it is a very snug fit, then just top it off with gorilla glue.

08-04-2005, 02:27 AM
Ok thanks. I have a few more things to ask you guys.
1. When i cut the hole's should i use a jigsaw? Or should i use the plunge router/circle jig combo? I know the plunge router/circle jig is more accurate but alot more expensive, will just carefully cutting with a jigsaw work out fine?
2. Should i glue the boards together before putting the screws in or just screw them together then seal it inside?
3. What kind of caulk should i use to seal the inside? Window caulk? And what brand is a good brand to use?

Car Trekker
08-04-2005, 09:27 AM
1 1/2 times the port diameter is reccomended for clearance.

08-04-2005, 11:35 AM
1. Jigsaw will work fine if you work slowly and draw a perfect circle to begin with.
2. Common practice is to put the pieces on piece by piece. First, predrill two holes on the two ends of the wood that you are putting together. Immediately drop screws into these two holes (No glue). Then predrill as many holes as you would like between these two screws. Then remove these two screws, and then put them back in so you have like 1/2" between the two pieces that you are putting together. Put lots of glue inbetween the two pieces of wood, and then screw every screw down.
3. 100% silicone caulk from brand GE at your local hardware store.
$5/tube, for Tub and Tile.

08-04-2005, 07:47 PM
Thx, and to get the cutting on the jigsaw started, do i just drill a big hole or what?

Moe Lester
08-04-2005, 08:27 PM
4" behind it MINIMUM, other than that you should be good. Id also keep it 2" away from any wall

08-04-2005, 08:52 PM
Thx, and to get the cutting on the jigsaw started, do i just drill a big hole or what?
Drilling a hole would be good. But...

Some jigsaws you can gay into making the bit fall right into place. Start by holding the jigsaw so the teeth face down, and put the feet of the jigsaw in the center of the circle. then turn the jigsaw on and rotate the jigsaw so the teeth begin cutting into the wood.


08-05-2005, 04:28 AM
Oh, i almost forgot, what size screws do i use? And how far from the sides do i put the subwoofer? 2 inches for that also?

08-06-2005, 05:31 AM
Ok, another question, sorry for all the questions but this is new to me and i cant find these answers... When i account for the size of the enclosure, which i want to be 2.2 feet cubed, is that 2.2 the green area in this picture?
Or this picture?

Ohh, and how far from the sides do i need the subwoofer? And can i make this port upfiring with the sub in front? Because with the dimensions of my car, i cant fit both the port and the sub on the front panel.

08-06-2005, 05:36 AM
Number 1

08-06-2005, 05:41 AM
Oh and i dont think it matters how close ur sub is to a wall as long as there is space for the vent on the back.

08-06-2005, 06:20 AM
Can i put the port top firing and have the sub in front though? And how do i figure out the volume the sub displaces?

08-06-2005, 10:37 AM
rice would be the best way to get that volume....but I'm sure someone might be able to tell you if you tell us what sub....

08-06-2005, 06:03 PM
Power Acoustik FUBR-12. Uhh, if i use rice, wouldnt that get into places it shouldnt be?

08-08-2005, 05:52 AM
Bump. If i use rice, won't the rice get in places it shouldnt be or will it be fine if i just blow it out with an air compressor. And also, can i put a port top firing and have the sub front firing?