Interactive Acoustic Calculator
Version 1.0

Model room response before you move a speaker.

Set room dimensions, listener position, speaker placement, and wall reflections to preview how the room may respond before you commit to a setup. Switch between frequency and time views, save comparison curves, and export the graph when you want to share or review a result.

Joseph Sahyoun
Joseph Sahyoun Author
CEO of Earthquake Sound Bachelor of Science - Electrical and Electronics Engineering Master of Science, Nuclear Engineering
Step 1

Room Setup

Enter room dimensions to begin with basic geometry before working with advanced acoustic controls.

ft
ft
ft
Length17.22 ft Width15.75 ft Height9.84 ft Front 1.0 Back 1.0 Left 1.0 Right 1.0 Ceiling 1.0 Floor 1.0 S1 S2 L
Room boundary and wall shading
Speakers
Listening position

Volume

2,669cu ft

Speaker Distance

10.08ft

Status

Ready
Step 2

Speaker And Listener Placement

Listening Position

Lx
Ly
Lz

Speaker 1 Right

S1X
S1Y
S1Z

Speaker 2 Left

S2X
S2Y
S2Z
Advanced Acoustic Controls Hidden by default

Wall Reflection / Sabine Factor

A wall at 1.0 means fully reflective with no insulation. A wall at 0.0 means no reflection at all, which is theoretical but useful as a reference. If a wall is partly open, such as a room opening into a kitchen, a value like 0.5 can represent that half-open boundary.

Applies a published absorption class to all six surfaces, then you can fine-tune each wall below.

Custom surface mix. Use a published preset, then adjust individual walls below if the room is not symmetrical.

Primary Walls

Front and back walls are the most important surfaces to control in the audio system.

Primary wall reflection control.
Rear-wall reflections are also primary.

Secondary Walls

Left and right walls are the second most important surfaces for controlling reflections.

Side-wall reflection control.
Adjust independently from the left wall.

Tertiary Walls

Ceiling and floor are still important, but after primary and secondary walls.

Use for overhead damping treatments.
Try 0.7 for carpet-like absorption.
Recommended workflow: start with all walls at 1.0, then lower only the wall you want to treat. Use values like 0.7 for softer finishes and 0.5 for a partly open wall.

Frequency Controls

Lower frequencies define the left edge of the response graph.
Keep this moderate for point-source accuracy.
Higher values increase curve resolution.
Allows extra detail around peaks and dips.
Higher values increase simulation depth.
Used for the time response decay behavior.

Model Options

Keeps dipole behavior visible in the page for advanced users who need it.
Excel notes suggest staying near or below -100 dB for stronger steady-state accuracy.
Results

Frequency Response

Reflected Images

1,561

Image Calculations

315,322

Delta

0.00

Attenuation

-43.09 dB
3020100-10-20-30-40-50-60 10501005001k5k10k 10 0 -10 -20 -30 -40 20 100 200 500 1k 2k 5k 10k Frequency (Hz) SPL (dB)
Frequency curve now follows the Excel workbook response model on the workbook-style +30 dB to -60 dB scale with 201 plotted points, 1561 reflected images, and 315322 image calculations. Minimum plotted frequency resolution remains above 50 points. The grid divisions now match the workbook log-frequency view, and the visible curve shows 11 major modes and 11 anti-modes.
Save reference curves, export charts, and compare multiple setups from one place.