AcousticsCheck

AcousticsCheck is a professional room acoustics measurement tool developed by B&L Lund, AB Sweden — built for acousticians, building engineers and facility managers who need fast, reliable measurements in the field. THREE MEASUREMENT METHODS • ESS (Exponential Swept Sine) – Play an exponential sweep through an external loudspeaker and let the server compute the impulse response via deconvolution. Returns T20, clarity (C50/C80) and STI per octave band (125 Hz–4 kHz). • Interrupted Noise – Classic ISO 3382 method. Pink noise is played and cut abruptly. The app records the decay and computes T20 via Schroeder backward integration. • Impact – Clap your hands or use a starter pistol. The app captures the impulse response and analyses it on the server. PROFESSIONAL MEASUREMENT ACCURACY All measurements are analysed on B&L's server using the same algorithms as professional acoustic software. You receive band-resolved T20 with uncertainty estimates, signal-to-noise ratio per band, and R² values for the decay line fit. Measurements with high background noise are flagged automatically. MICROPHONE CALIBRATION Connect a calibrated measurement microphone (USB or analogue via an adapter) and upload your calibration file. The app applies the frequency correction automatically to every measurement so results are traceable to NIST/PTB standards. SPEAKER PROFILING Unsure about the frequency response of your measurement setup? Hold the phone 5–10 cm from the driver and let the app build a loudspeaker correction profile automatically. The profile is stored locally and applied in real time during ESS analysis. MEASUREMENT HISTORY AND COMPARISON All measurements are saved locally with date, room details and results. You can label rooms, add volumes and compare against Swedish and Nordic standards (SS 25268, BBR, Boverket). Recordings can be played back directly in the app. QUOTE REQUEST Select rooms that need treatment and send a combined request to B&L Lund AB. Attach measurement data, room information and photos directly from the app. Previous requests are saved and can be supplemented with follow-up measurements after treatment has been carried out. REQUIREMENTS FOR ESS MEASUREMENT • Wired external loudspeaker (Bluetooth introduces too much latency) • Calibrated measurement microphone recommended • Internet connection for server analysis Requires Android 8.0 or later.