Explore the acoustic properties of your room.
Room acoustic analysis is the first and most critical step in designing a studio, listening room, or home theater. Without accurate data on how sound behaves in a specific space, any treatment is a shot in the dark. Our calculators provide a complete acoustic picture right in your browser — from standing wave calculation to a comprehensive eight-metric report.
Every room has a set of resonant frequencies (modes) determined by its dimensions. Axial modes — between two parallel surfaces — have the greatest impact: peaks up to +10 dB and dips down to −20 dB in the low-frequency range below 300 Hz. Tangential and oblique modes further shape the picture. Uneven mode distribution leads to boomy, unclear bass and unreliable monitoring.
Reverberation time (RT60) measures how quickly sound decays: for a recording studio, the recommended range is 0.3–0.4 s; for a mixing room, 0.2–0.3 s; for a home theater, 0.4–0.6 s. Speaker-boundary interference (SBIR) and flutter echo between parallel walls add artifacts that must be identified before acoustic treatment begins.
The Bonello and Bolt criteria help evaluate room proportions at the planning stage: if dimensions can be adjusted, these tools show which length-width-height ratios yield the most uniform mode distribution. For existing rooms, analysis results become the foundation for absorber design and monitor placement.
Calculation tools
Diagnostics from room dimensions and monitor specifications.
Find first-reflection points on your walls, floor, and ceiling using the image-source method. Get treatment priorities for monitor and voice recording setups.
Analyze a WAV impulse response in the browser — your file never leaves the device. Compute EDC, EDT, T20/T30, RT60, C50, C80, D50 from REW or ARTA recordings.
Estimate how clearly speech sounds in your room. Plain-language rating with an optional STI / RASTI calculation for the design stage of podcast rooms, lecture halls and home studios.
Room acoustic profile: comprehensive diagnostics of dimensions, volume, surface area, and acoustic properties.
Calculate axial, tangential, and oblique room resonances from room dimensions. Identify standing waves and low-frequency problem areas.
Calculate reverberation time (RT60) using Sabine and Eyring formulas. Compare results with recommended values for your room type.
Calculate speaker-boundary interference response (SBIR). Predict frequency dips and peaks caused by nearby walls, floor, and ceiling.
Estimate the background noise level in your room. Rating against SanPiN 1.2.3685-21 or international NC criteria, broken down by source: HVAC, outdoor and internal noise.
Detect and analyze flutter echo between parallel surfaces. Calculate repetition rate and delay time.
Analyze room mode distribution across 1/3 octave bands using the Bonello criterion. Identify problematic frequency clustering.
Check if your room proportions fall within the Bolt preferred area for good acoustics. Evaluate dimensional ratios against optimal modal distribution.
Measurement tools
Microphone, live spectrum, and imported measurements.
Project tools
Treatment and placement planning based on diagnostics.
Optimize speaker placement in your room. Calculate ideal positions based on room dimensions and listening position.
Where to place a subwoofer in your room: layouts for single and dual subwoofers, diagrams, and step-by-step instructions to find your listening sweet spot.
Plan acoustic treatment for your room. Select materials, place absorbers and diffusers, and see the effect on RT60.
1. New room or renovation.Start with "Bolt Area" and "Bonello Criterion" to verify that room proportions allow acceptable mode distribution. If dimensions can be changed, adjust them before construction.
2. Existing room.Run "Spectrum Analyzer" to listen for problem frequencies live, then open "Room Profile" for a unified report with all key metrics — modal ranges, reverberation time, and SBIR zones.
3. Specific issue.If a particular note booms in the room, use "Room Modes." Hearing ringing between walls? Check "Flutter Echo." Bass is muddy near a wall? Open "SBIR."
4. After analysis, move to the Treatment section for absorber design and to Equipment for optimal monitor placement.