Free Subwoofer Port Air Velocity Calculator
Calculate peak resonant air velocity (m/s and Mach number) inside bass reflex ports to eliminate chuffing and turbulent wind noise.
🔊 Subwoofer & Port Parameters
📊 Velocity & Chuffing Analysis
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Frequently Asked Questions
What is the maximum acceptable port air velocity for a home theater subwoofer?
For high-end home theater subwoofers where quiet low-frequency passages (18–25 Hz) occur, target port air velocity under 17 m/s for straight vents, or under 24 m/s for precision dual-flared aeroports.
Does flaring a subwoofer port change its tuning frequency?
Yes. Flared ends possess acoustic end-correction factors that make the port behave slightly shorter than a straight pipe of the same physical length, raising the tuning frequency by roughly 5% to 8%.
What is Vd in speaker design?
Vd is the maximum volume displacement of the speaker cone, calculated by multiplying effective radiating cone surface area (Sd) by one-way linear excursion (Xmax): Vd = Sd × Xmax.
Is a slot port quieter than a round aeroport?
A slot port typically has more surface friction area than a round port, but its large cross-sectional area easily keeps velocity low. Round ports with generous 1-inch radius flares remain the quietest per square inch of port area.