Box building program

[BrianChia 10+ year member]

Tuning frequency is dependent on the following 3 factors:
1. Enclosure volume.

2. Port length

3. Port cross-sectional area

1. Enclosure volume is dependent on how long your port and how wide your port is, because the more air the port takes up in the box, the less volume, and the greater the tuning.

2. Port length is dependent on enclosure volume and cross secitonal area because the longer the port, the lower the tuning, and the greater the cross-sectional area, the greater the tuning.

3. Port area is dependent on the parameters of the drivers, most notably Xmax and Sd, which when multiplied together give you Vd, which is how much air the speaker moves or displaces. The smaller the port area, the more port noise, the wider the port area, the less port noise, but the wider the port, the greater the tuning, and as well, less volume for the speaker which also raises the tuning.

If you didn't understand that, you have no reason to even begin to use a box building program, as it won't help you learn nearly as much as reading will (trust me on this, these programs have been around for quite some time).

Makes zero sense.

Enclosure volume is dependent on the driver not on the port.

 

[PV Audio 5,000+ posts]

Makes zero sense.
Enclosure volume is dependent on the driver not on the port.

We are assuming you have a range of Vbs, therefore you can choose a port tuning to fit.