Speaker Port Calculator

Calculate port length and diameter for vented speaker enclosures.

Enclosure Parameters

Box Volume (Net)

Liters (L)

Target Tuning Freq (Fb)

Hertz (Hz)

Port Diameter

Inner diameter (cm)

Number of Ports

End Correction (k)

PORT

Results

Required Length22.13 cm8.71 inches

Tuning40 Hz

Overview

Port calculation tunes enclosure to specific frequency. Port length and diameter affect tuning. Essential for bass reflex speaker design.

💡

Pro Tips

Port tuning: 30-40 Hz typical for subwoofers.
Larger diameter = less port noise.
Multiple ports split airflow.
Port velocity causes chuffing if too high.

Fun Facts

"Port velocity should stay under 17 m/s."
"Flared ports reduce turbulence."
"Slot ports common in car audio."
"Bandpass: ported on both sides of driver."

Formula: Port Length = (23562.5 × Diameter²) / (Volume × Frequency²) - 0.732 × Diameter

Used with this

Similar tools that might be useful

Actscore Calculator

Asciiconverter

Acceptance Rate