How the slot port calculator works
Port area is width × height. The same Helmholtz relation as a round port gives effective acoustic length; end correction uses an equivalent diameter 2√(WH/π).
Key terms
- Slot port - rectangular opening used when round ports are too long or impractical.
- Equivalent diameter - round port with the same area as the slot, for end correction.
- Fb - box tuning frequency where port and compliance resonate.
Frequently asked questions
- When use a slot port? When a round port would be too long for the cabinet or when the baffle layout fits a slot better.
- How wide should the slot be? Keep port air velocity reasonable at peak excursion; increase area or use multiple ports if velocity is high.