Visaton Bass Reflex Tube BR 25.50
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This port has a tube length of 25 cm, an opening area of 50 cm² and a cabinet cut-out of 97 mm. Use these dimensions with the intended enclosure volume and tuning; port size alone does not determine the bass response.
Typical applications
- Vented DIY loudspeaker cabinets
- Replacement of a port with matching dimensions and tuning
Full specifications
| Tube length | 25 cm |
|---|---|
| Cut-out diameter | 97 mm |
| Opening area | 50 cm² |
| Form | Bent, flared at both ends |
| Application | Bass-reflex enclosure |
| Manufacturer reference | 5216 |
Dimensions and drawings

Mounting drawing · Open original image
Installation and cabinet guidance
Follow the cabinet plan or calculate the tuning for the chosen driver and net enclosure volume. Allow clear space around both port ends.
Check the original drawing and panel fit before cutting. A change in effective port length or area changes the enclosure tuning.
