SoundMaster SLM 4+

The accurate sound level meter

Lazaros Vrysis

    • 5,99 €

iPhone Screenshots


• Overview
- SoundMaster aims at delivering the most robust sound level measurement readings on the App Store
- Audio data is captured directly from input buffers, ensuring a robust and responsive measurement output
- Features state-of-the-art algorithmic implementations, ensuring high-accuracy readings
- UI is polished to perfection, delivering professional-grade user experience
- Comes pre-calibrated using reference equipment

• Main Features
- Professional sound level measurement capabilities
- Advanced calibration and equalization support
- Extended measurements management

• Under the hood
- 44.1kHz/32bit raw audio recording
- 20Hz to 20kHz frequency response
- 90dB dynamic range, from 25dB to 115dB SPL[A]
- ±1.4dB accuracy @25dB-115dB SPL[A]
- Low latency and processing-loss spectral analyzer
- Audio I/O latencies monitoring and compensation

• Noise Measurements
- Digital VU and numeric visualizations
- Broadband RMS, Peak, Max, Min, Leq and measurement duration data handling
- Impulsive, Fast and Slow response modes
- A, B, C, D, Z weighting filters

• Advanced Calibration
- Calibrated and equalized for all iPhone models
- Calibrated for the MicW i436, as an external input source
- Calibration data is OTA (Over the Air) updated
- Additional user calibration and equalization banks for both embedded microphone and external input source
- Custom octave-based gain adjustment support

• Session Management
- Frame-based time-series of measurement data handling
- Overall statistics calculation for noise measurements
- Photo capture capability
- Time and geolocation awareness support
- Title, location and comments metadata support
- Audio recording (CAF format), measurement data (CSV format) and metadata export capabilities

• Additional Capabilities
- Option for keeping the device awake during recording
- Option for auto-stopping measurements after a pre-configured duration
- Background recording capability
- Upside down orientation support

What’s New

Version 1.3.2

Resolved an issue with dark mode.

App Privacy

The developer, Lazaros Vrysis, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary based on, for example, the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

More By This Developer

Army Knife
SoundMaster ISA
SoundMaster RTA
Photo & Video
SoundMaster RVA

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