Find the frequencies your room exaggerates

Bass that booms in one corner and vanishes in another isn't your speakers — it's standing waves. Your room's dimensions tell you where they sit.

Tools used in this guide

The job

Every rectangular room resonates at frequencies set by its dimensions — half a wavelength fits the length, so f = speed of sound ÷ 2 × dimension, and harmonics stack above. Below ~300Hz these 'modes' are separate, audible humps, not diffuse reverb.

Three numbers in

Enter length, width, height in metres. You get the axial mode table (length/width/height fundamentals and harmonics), coincidence warnings where two dimensions share a frequency (double-strength boom), and the Schroeder frequency — above it, modes blur into normal reverberation.

Coincidences are the dangerous ones: a 5m × 2.5m room shares modes at ~34Hz multiples.
Cube-ish rooms are worst — equal dimensions stack every mode on the same frequencies.

Then what

Knowing the frequencies explains measurement and listening position. A mode at 60Hz means the listening seat halfway down the room length sits in its null — move the seat, or treat that frequency specifically.