Verification note: Results are design aids, not stamped engineering or code approval. Always check the current project specification, adopted code, manufacturer data and latest edition of the cited standard before construction or procurement.

AUDIO

Room Acoustics Scorer

Room-ratio and axial-mode screening tool using identified published criteria.

This is a pre-design screening aid. It does not replace a full acoustics model or consultant review.

Room-proportion and axial-mode screening

Room length (m)

Room width (m)

Room height (m)

Speed of sound (m/s)

Enter values and calculate.

Axial modes: fₙ = n × c / (2d)
ITU-R BS.1116-3 room-proportion screen: 1.1(W/H) ≤ L/H ≤ 4.5(W/H) − 4, with L/H < 3 and W/H < 3.
For the ITU screen, H is the entered room height; the two horizontal dimensions are ordered so W ≤ L.
Bolt Area is historical room-proportion guidance and is not the same thing as an AVIXA standard.

WORKED EXAMPLE

Example — small training room

The room dimensions drive the axial mode distribution. Additional finishes and occupancy affect reverberation, so a simplified Sabine estimate is provided for concept use only.

Source details

ITU-R BS.1116-3 — in-force recommendation used for the room-proportion inequality.
R. H. Bolt, “Note on Normal Frequency Statistics for Rectangular Rooms” (1946) — historical Bolt Area origin.
AVIXA AV Math for Design — general AV design math training.