A room-acoustics drawing instrument

Resonant Room

Move the source and listener. Draw the room larger. Paint the walls. Then hear what changed.

Drag the selected object · keyboard S/L/C then arrows · Shift for fine steps

4.80 × 3.80 × 2.55 mroom

1.39 spredicted RT60 at 500 Hz

72.3 Hzstrongest audible axial mode

12.5 msearliest first reflection

Select a mode to see where the room pushes and cancels at the listening position.

Room and exact positions

Width (m)Depth (m)Height (m)

Source XSource YSource heightListener XListener YEar height

Treatment segments

Accessible wall editor

Keep this acoustic plan

Plan name

Load plan

The room is bare. Paint the physical wall edge or use the segment editor.

Technical evidence — modes, first arrivals, materials, and limits

Mode	Hz	Q	listener

arrival	metres	ms	gain

This is a planning model for rectangular rooms. It uses axial modes, first-order image sources, tabulated absorption, and a Sabine-style mid-band decay estimate. It does not model tangential or oblique modes, scattering geometry, construction transmission, loudspeaker directivity, or measured impulse responses.

Audio waits for a click. The visual model works without sound.