Bends in a round port

[ikpthegame 10+ year member]

Been a long time since I've had to do this but how do you find the length of a round port with bends? I forgot how the bends get calculated

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[1aespinoza Premium Member]

Been a long time since I've had to do this but how do you find the length of a round port with bends? I forgot how the bends get calculated

The way I would calculate is measure the outer and inner lengths. Add them and divide by 2.

 

[ThatChevyGuy 5,000+ posts]

Bent ports will give your port noise like the bends. I have never seen this personally, at least in auto applications...what is the reason

 

[2RZ-FE 10+ year member]

measure down the center

 

[SlugButter]

You’ll get port noise bending round ports, negating the advantage of using round ports. Round ports are more efficient and have less internal surface area than a slot port, until you put a bend in it. Now you have a turbulence point. The only way to avoid this is to get 16 SQ. Inches of port area per sq. foot of box space, which now means multiple bends and a lot of box space taken up by port. I love round ports and use them all the time, but they need to be straight with no bends and they need to be flared. My 2 cents.

 

[ikpthegame 10+ year member]

Just needed a port about 25" long for a 6" port, but I could drop down to a 4" port then it's only 10.5" long

 

[SlugButter]

Just needed a port about 25" long for a 6" port, but I could drop down to a 4" port then it's only 10.5" long

Is it a single 12? 4 inch ports work fine for 12s. I had this box in my SUV for a while with a few different subs ranging from 500 watts to 1500 watts and they all did fine with the 4 inch flared port.

 

[audiobaun 5,000+ posts]

Is it a single 12? 4 inch ports work fine for 12s. I had this box in my SUV for a while with a few different subs ranging from 500 watts to 1500 watts and they all did fine with the 4 inch flared port.
View attachment 50600

That is a SWEET AZZED Enclosure!!! Beaut!

 

[Doxquzme Premium Member]

Assuming you are using a 90 degree bend, just measure the length from the middle of the tubes opening to the point of intersection and then to the other end of the bend.

 

[Doxquzme Premium Member]

Been a long time since I've had to do this but how do you find the length of a round port with bends? I forgot how the bends get calculated

Assuming you are using a 90 degree bend, just measure the length from the middle of the tubes opening to the point of intersection and then to the other end of the bend.