How do I determine port size on a speaker box?

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 big should the port be on a sub box?

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 does Port length affect sound?

Longer port = lower tuning. Shorter port = higher tuning. What tuning to use depends on several factors (speaker, box, what kind of response curve you’re going for, etc.) and it significantly changes the sound.

What is the best tuning freq for a ported box?

A range between 30 and 35 Hz is generally good for most general setups. If you want SPL, tune high. If you want SQ, tune low. If you want somewhere in-between the two, we have found a good tuning is right at 33Hz.

What size box do I need for a 10 inch sub?

A good rule of thumb is to add at least 2 to 3 inches to the size of the subwoofer. For example, a 10-inch sub should have a front panel at least 12 to 13 inches square. Size the depth of the box to create the volume you require for your box.

Do ported sub boxes hit harder?

Air flowing through the port adds to the boom. Another reason ported subs hit so hard and deep is that the air flowing in and out of the port creates an audio effect like that made by a whistle or blowing across the mouth of a bottle, and that tone adds to and strengthens the note the cone plays.

Can you add a port to a sealed box?

You can not convert a sealed to a ported. You would be best to sell the sealed and buy a ported, or add more sealed subs. You can plug the port on some ported subs to make it behave like a sealed.

How much airspace do I need for a 15 inch sub?

15 inch drivers: 5.0 to 9.0 cubic feet.

Are longer Ports better?

As we mentioned, ports with smaller cross-sectional areas will be easier to move and can be tuned lower without making the port too long. The other advantage of smaller ports is that they’re easier to achieve high air velocity with. Try blowing through a straw and see how much force you can generate.

How much airspace does a 10 inch subwoofer need?

According to the JL Audio website, the recommended volume space for a 12-inch subwoofer is 1.25 cubic feet. For a 10-inch woofer, the volume recommendation is 0.625 cubic feet, and the recommendation for an eight-inch speaker is 0.375 cubic feet.

Is there a port length calculator for speakers?

Since I’ve never seen two port calculators that would give the exact same port length for a given box volume and tuning frequency, the port calculations from this calculator will probably be slightly different than other calculators.

How to calculate the volume of a speaker enclosure?

If you want to use square ports, use a port who’s height multiplied by its width equals the ‘port area’ on the calculator. The port length will be the same as the round port. If you have or need an enclosure with all right angles (no slanted sides) set depth1 and depth2 to the same value (whatever the depth of your box is).

How to calculate the dimensions of a subwoofer box?

Imagine how much time you will need to calculate the length of a port by its area and the net volume of a box, then calculate the occupied volume by the port, add it to the net internal volume of a box, and only after that, calculate the dimensions of a box, taking into account the material thickness.

How to build a low frequency speaker box?

Build a ported box, sealed box for your low-frequency speaker. Make a subwoofer enclosure plan. Calculate a speaker box volume, port length and other parameters without getting confused in formulas.