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Calcimator

Home Theater Acoustics Calculator

Calculate room modes, acoustic treatment, bass trap placement, and amplification for home theater design.

Inputs

Results

Lowest room mode (Hz)

28.3

Room volume (cu ft)2,520
Acoustic panels (sq ft)232
Bass traps needed5
Sub position from wall (ft)6.7
Amplifier power (watts)350
Surface Area1,172
How to Use This Calculator
  1. Enter Length (ft), Width (ft), and Height (ft).
  2. Set Speaker channels and Subwoofers.
  3. Review the Lowest room mode (Hz) result.
  4. Use Room volume (cu ft) and Acoustic panels (sq ft) to inform your decision.

How the result changes with Length (ft)

Length (ft)Lowest room mode (Hz)
1340.4
2126.9
3018.8
3715.3

What each input means

Length (ft)
Room length.
Width (ft)
Room width.
Height (ft)
Ceiling height.
Speaker channels
Number of speaker channels (5, 7, 9, etc.).
Subwoofers
Number of subwoofers.

What each result means

Room volume (cu ft)
Total room volume.
Lowest room mode (Hz)
First axial mode frequency.
Acoustic panels (sq ft)
Panel area for target RT60 of 0.4s.
Bass traps needed
Corner bass traps recommended.
Sub position from wall (ft)
Rule-of-thirds subwoofer placement.
Amplifier power (watts)
Total amplification for reference level.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Length (ft) = 20, Width (ft) = 14, Height (ft) = 9, Speaker channels = 7 = 5 input(s) provided
  2. Calculate Lowest room mode
    Lowest room mode = min(axialModeLength
    28.3 = 28.3
  3. Calculate Room volume
    Room volume = lengthFt * widthFt * heightFt
    2520 = 2520
  4. Calculate Acoustic panels
    Acoustic panels = round(requiredAbsorptionImperial / 0.8 * 0.6)
    232 = 232

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