Bass Reflex Port Length Calculator
Round port length from box volume, tuning Fb, and port diameter (end correction included).
How the bass reflex port calculator works
From box volume Vb, tuning frequency Fb, port diameter, and end correction factor, the tool calculates acoustic port length and physical length including end correction-standard vented-box loudspeaker design.
Key terms
- Fb - box tuning frequency where port and compliance resonate.
- Vb - net internal enclosure volume in litres.
- End correction - extra effective length because port ends are not infinitely terminated.
Frequently asked questions
- What is Fb? The tuning frequency where the port and box compliance resonate, shaping low-bass response of a vented system.