Bass-reflex speaker enclosure vent calculator Bass-reflex speaker enclosure vent calculator

Quick start

Estimate a round bass-reflex port with clear end corrections.

  1. Enter net box volume and tuning
  2. Set the port geometry and driver excursion
  3. Compare tube lengths and estimated air speed

Bass-reflex speaker enclosure vent calculator

Calculate round vent tube length, combined vent area and estimated air velocity from internal enclosure volume, tuning frequency and speaker cone movement.

Calculator settings

Check the enclosure designEnter net box air volume, excluding the driver and ports. End corrections approximate straight round tubes. Air speed is a kinematic estimate from the entered excursion, not a measured acoustic simulation. Compare with your driver design; flares, bends and wall thickness need separate checks.

Result

Port Length
38 cm
Total Port Area
78.5 cm²
Estimated Air Speed
17.3 m/s
Enclosure tuning frequency
34 Hz
Speaker driver displacement volume
0.64 l
Air volume inside the ports
2.98 l

Compare end corrections

End geometry
Both ends unflanged
Approximate tube length
39.2 cm
End geometry
One flanged end
Approximate tube length
38 cm
End geometry
Both ends flanged
Approximate tube length
36.8 cm

Bass-reflex speaker enclosure vent calculator online

Calculate round vent tube length, combined vent area and estimated air velocity from internal enclosure volume, tuning frequency and speaker cone movement.

The result is an engineering or planning estimate. Verify critical dimensions, prices, limits and safety requirements before making a final decision.

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