About this tool
The Room Modes section groups three tools for analyzing low-frequency problems. The mode calculator computes every standing wave from room dimensions — this is the starting data for any acoustic treatment. The Bonello chart evaluates how evenly resonances are distributed across one-third-octave bands and reveals where frequency clusters cause audible booming. The Bolt Area diagram checks room proportions against a proven zone of optimal side ratios.
Why it matters: modes are the primary cause of uneven bass in small and medium rooms. But a list of frequencies alone is not enough — you need to understand how they are distributed (Bonello) and whether problems are baked into the room geometry (Bolt). These three tools work together: you start with the mode calculation, verify the distribution, then check how close your proportions are to the optimal zone.
How to use this section: pick a tool from the cards above. If you are analyzing a room for the first time, start with the mode calculator, then move to the Bonello chart. If you are choosing or designing a room, check proportions against the Bolt Area first.
Next steps: after analyzing resonances, compute reverberation time with the Sabine and Eyring formulas and plan treatment in the Treatment Planner.
