## How do you calculate ports?

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. In our example box, we have an inside height of 14.5 inches.

**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.

### How do you calculate the volume of a ported box?

You simply measure the height, width and depth (in inches), multiply them together and then divide that number by 1728. If the box has internal measurements of 6″ high*18″ wide*12″ deep then the volume of the box is 1296/1728=. 75 ft^3. The diagram below shows how you would measure the dimensions of the box.

**How is port length measured?**

The physical length of the port is measured down the dead center of the port from end to end.

#### How do you calculate port velocity?

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.

**What is port area?**

Definition: An area spatial object which is used to represent the physical limits of all the facilities which constitute the terrestrial zone of a sea or inland port. PortArea.

## What is the formula to calculate volume?

Whereas the basic formula for the area of a rectangular shape is length × width, the basic formula for volume is length × width × height. How you refer to the different dimensions does not change the calculation: you may, for example, use ‘depth’ instead of ‘height’.

**Does box volume include port volume?**

Your gross volume will include your driver and port displacements. So if you want to build a ported enclosure for a 12″ sub, and you’re wanting it to be 2.5ft^3 tuned to 30hz, that’s your net, and you’ll need to add to that 2.5cf however much the sub and the vent will displace.

### Is a bigger port better?

Larger ports provide more bass response, while smaller ports are better at producing higher frequency sounds.

**How big should my port area be?**