Acoustic Room Mode Analyzer
Find axial, tangential, and oblique standing-wave modes for a rectangular room, flag problematic low-frequency resonances, and check recommended room ratios.
Room Geometry
Room Mode Results
Fundamental Axial Modes
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Hz along Lx / Ly / Lz
Flagged in Problem Range
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modes below display cutoff
Modal Density Estimate
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modes / Hz at 200 Hz
Room Volume
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cubic units
| # | Mode Type | Indices (nx, ny, nz) | Frequency (Hz) | Status |
|---|
Recommended Room Ratios (Bolt Area & Common Standards)
Ratios are scaled so the smallest recommended dimension equals the current shortest side. Well-spread ratios avoid coincident (clustered) modes.
| Standard | Ratio (H : W : L) | Recommended Dims (current units) | Match |
|---|
Formula Breakdown
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Informative Guides & Helper Articles
Best Practices for Acoustic Room Mode Analysis
Best practices for measuring and treating room modes: mic placement, bass traps, monitor positioning, and dimensional planning.
Read Article →Common Errors in Acoustic Room Mode Analysis
Fix common room-mode mistakes: mode-type confusion, unit errors, miscounting modes, and misreading modal density as bass quality.
Read Article →Future Trends in Acoustic Room Treatment
Active bass absorption, AI-guided room tuning, and parametric digital correction: the future of acoustic room-mode management.
Read Article →Ultimate Guide to Acoustic Room Mode Analysis
Master standing waves, axial/tangential/oblique room modes, and low-frequency resonance control with the room-mode formula.
Read Article →Top Optimization Tips for Acoustic Room Modes
Optimize bass response: dimension ratios, speaker placement, tuned bass traps, and measurement-driven room tuning techniques.
Read Article →How to Use the Acoustic Room Mode Analyzer
Computes axial, tangential, and oblique room modes, flags problem frequencies, and checks Bolt-area room ratios.
- Enter room dimensions (L x W x H).
- Read the mode map: axial modes dominate; stacked modes below 300 Hz are the booms.
- Check the Bolt ratio for room proportion quality.
Room Modes: f = c/2L
Axial modes (strongest) resonate at f = c/2L - with c ~343 m/s, a 4.57 m room length modes at ~37.5 Hz and its multiples; width and height add series, and coincident series stack into boom-or-dead spots. Below ~300 Hz is modal territory where treatment is positioning, not foam: moving speakers and listener off mode extremes (the 38% rule for listener depth is the classic start) fixes what EQ cannot. Bolt ratios identify proportions that spread modes evenly - cubes are worst because every axis modes identically.
Acoustic Room Mode Analyzer FAQ
Why does my room boom at certain notes?
Standing waves: dimensions resonate at f=c/2L and multiples. Coincident modes from different axes stack.
What is a Bolt ratio?
A room-proportion check: dimensions that spread modes evenly. Avoid cubes and 1:2 integer ratios.
Can EQ fix room modes?
No - nulls cannot be boosted back. Move speakers/listener off extremes first, treat corners second.