How big should subwoofer port be?
16 square inches of port area per cubic foot of box volume, make the port 18-20 inches deep. The port is tuned to the box volume, not the subs. This generally tunes the box to the upper 30Hz area, with the vehicle transfer function extending the frequency another 10-12Hz or so.
How do you measure a port for a subwoofer?
The port area is in square inches, meaning it takes height times width to calculate total area. A port 4 inches high by 4 inches wide would calculate as 4 x 4= 16 in2.
How do you calculate port displacement?
To determine the displaced volume of the port, we simply multiply the cross-sectional area by the internal length of the port (which we have already determined as 12” in this example.) Displaced Volume = 9.61625 X 12 = 115.395 cu.in.
Are longer Ports better?
The lower the port is tuned, the longer it needs to be, and as we discussed, longer ports are harder for woofers to move. So, often times a compromise must be made to achieve a lower tune. If Lewis wants to make his build more brutal by making it windier we’re going to be primarily focused on smaller, shorter ports.
What happens if subwoofer port is too big?
Remember, there is such a thing as too big. As the size of the enclosure increases, the mechanical limits of the woofer will be easier to reach. If the port becomes too small, it may result in port noise, or allow the woofer to simply unload. Do not underestimate the sub / port arrangement.
How big should my port area be?
To keep port velocities right around 30 m/sec you can multiply the square root of the power density by . 605 and that will give you how many sq in per cubic foot of box volume you need. So in my example of a 500 watts per cube enclosure that means you need 13.5 sq in per cube.
How to calculate the port length of a subwoofer?
A port length is defined as the proper length of the vent of a subwoofer. How to calculate a port length? First, determine the vent diameter. Next, determine the total number of ports. Next, determine the volume of the box housing. Next, determine the tubing frequency. Finally, calculate the port length using the formula above.
How to calculate the interior volume of a subwoofer?
To calculate interior volume, first convert all fractions to decimals (½ = .5) before entering the width, height, depth, or diameter, and thickness into any of our speaker box calculators below. For additional subwoofer wiring options, please see our Subwoofer Wiring Wizard.
How to calculate the length of a round port?
To calculate the port length of a round port, enter the diameter of the port (D), the box volume (Vb) in cubic feet, and the desired tuning frequency (Fb). Here is the formula we use: ( (14630000* (D/2)* (D/2))/ ( (Fb*Fb*Vb*1728)- (1463* (D/2)))) Please compare your answers with other programs that include other allowances such as tapered ports.
How to calculate the port length of a vent?
The following is the port length formula: L = [ (2.356*10^4* D^2*N)/ (V*F^2) ] * (k*D) Where L is the port length D is the vent diameter