Port length (1 Viewer)

[RandyMathis]

Finally got some more time to get back to planning a sonosub with the Atlas 15.

I am looking at internal dimensions of 22" diameter x 50" long (311.462 Liters or 11 cubic feet).

Am I correct that I would need two 22" long x 6" diameter ports to tune this thing at 16hz?

I can't wait until it warms up so that I can go outside and start cutting MDF.

 

[Patrick Sun]

Do you need two 6" wide ports? Is port noise really loud with just one 6" wide port?

 

[Dustin B]

A single 6" port will need to be just over 22" long. Dual 6" ports will need to each be almost 49" long.

 

[RandyMathis]

Thank You

 

[Yury]

I'm absolutely agree with Patrick Sun. I got the same serios problem about port noise.

but you can calculate port length:
L=(2354*D^2/VF^2)-0.85D
L - port length (mm)
D -port diam (mm)
V - box capacity (litres)
F - tuning frequency (Hz)