Audio Intensity
Sealed Box Calculator
Sealed Enclosure Designer
Enter your driver's Thiele-Small parameters to compute Qtc, Fc, and predict frequency response.
Driver Parameters
Thiele-Small specifications from your driver's datasheet.
Hz
Load example driver:
Calculated Results
Real-time sealed enclosure analysis.
Qtc
-
fc
-
Hz
Box Ratio
-
Vas / Vb
-3 dB point
-
Hz
Frequency Response
Relative SPL vs. frequency - normalized to passband level.
Optimal Vb Targets
Suggested box volumes for each alignment target. Click any row to load it.
| Alignment | Qtc | Vb | fc | -3 dB | Character |
|---|---|---|---|---|---|
| Enter parameters and calculate to see suggestions. | |||||
Formula Reference
Box Ratio (a)
a = Vas / Vb
System Q (Qtc)
Qtc = Qts x sqrt(a + 1)
System Resonance (fc)
fc = fs x sqrt(a + 1)
-3 dB Frequency
Solved numerically from H(f) = 1/sqrt(2)