Sealed Box Calculator

Design sealed (acoustic suspension) speaker enclosures. Calculate optimal box volume based on driver parameters.

Equivalent compliance volume
Total Q factor
Free-air resonance
0.5 (Tight) 0.707 (Butterworth) 1.2 (Boomy)

Sealed Box Specifications

28.4 liters

Box Volume:
28.4 L
System Fc:
42 Hz
F3 (-3dB):
38 Hz
Response Type:
Butterworth
Box Dimensions (assuming cube)
Internal:
30.5 × 30.5 × 30.5 cm
External (3/4" walls):
34.3 × 34.3 × 34.3 cm
Material Volume:
~12 liters

Qtc Reference

Qtc Value Response Character Best For
0.5 Overdamped Very tight, fast decay Analytical listening
0.577 Bessel Best transient response Music accuracy
0.707 Butterworth Maximally flat All-around best
0.9 Slight peak Warmer, fuller bass Home theater
1.0+ Underdamped Boomy, resonant Car audio (some)
Speaker Tools