SB41 plug-and-play smart sound level meter for IoT integration and automated noise monitoring

SB41 plug-and-play smart sound level meter for IoT integration and automated noise monitoring

At Bedrock, we continuously innovate to equip acousticians, audio professionals, architects, and engineers with next-generation tools for precise acoustic testing and certification. We’re proud to introduce the Bedrock SB41 (Class 1) and SB42 (Class 2) SoundBox—advanced USB-controlled acoustic analyzers built to redefine flexibility and automation in noise measurement.

Smart Design, Seamless Integration

The SB41 plug-and-play smart sound level meter for IoT integration and automated noise monitoring enables precision measurements in modern, automated environments. Unlike traditional handheld devices, the SB41 series acts as a high-performance front-end, controlled remotely via our intuitive API or Remote Display application.

This smart design allows you to embed a fully compliant Class 1 (SB41) or Class 2 (SB42) instrument directly into your PC, Raspberry Pi, or any computer-based monitoring system. It’s a powerful, IEC-61672 compliant solution tailored for remote access, data logging, and long-term environmental deployment.

Key Benefits of the SB41 Series

• Compact & Cost-Effective
  Lightweight and affordable without compromising Class 1 accuracy, making high-precision acoustic analysis more accessible.

• Ideal for Unattended Monitoring
  Perfect for consultants and integrators needing reliable, automated noise monitoring in smart-city networks, environmental studies, or embedded industrial systems.

• Flexible API & Control Options
  Use the full-featured Bedrock API for seamless integration or control the device manually via our Windows-compatible Remote Display application. Supports USB audio streaming as a high-end input device.

• Internal Flash Storage
  Includes 16 GB of internal memory, allowing autonomous data buffering even when USB communication is temporarily lost.

Precision Engineering You Can Trust

Proudly engineered and manufactured in the Netherlands—by the inventors of STIPA—the SB41 and SB42 offer:

• Electronics linear range >110 dB 

• Measuring range:

• • SB41 (Class 1): 30–128 dB (up to 145 dB with attenuator)

  • SB42 (Class 2): 30–122 dB (up to 145 dB with attenuator)

• Standards compliance:

  • ANSI S1.4

  • IEC-61672-1:2014 (Class 1/Class 2)

Whether you’re building an IoT noise monitoring system, embedding a smart meter into your own hardware, or conducting long-term environmental sound assessments, the SB41 delivers unmatched flexibility, precision, and value.

FUNCTIONALITY

The Bedrock SB41 offers the following features:

• STIPA and Full STI
• Speech Level Meter (cf. 602168-16)
• SPL meter
• Real-Time Analyzer (RTA) with 1/1, 1/3, 1/6 and 1/12 octave resolution
• Reverberation time (RT60)
• Statistical acoustics
• LEQ logging
• RTA logging / spectrograms (1/1, 1/3 octave resolution)
• Environment/safety logging and monitoring
• Noise Curves (NR/NC)
• Building acoustics, airborne and impact noise: SRI/STC, Dn’T/R’, L’nT, L’nw/L’nTw
• FFT analysis
• Oscilloscope
• AC Volt meter
• Loudspeaker polarity
• Calibrated audio recording.

More functionality to be added through free firmware updates.

FUNCTIONALITY

• 16 GB of internal storage, at least 15.8 GB available for storing measurement data
• Programmable and remotely controllable via USB
• Downloading of measurement data and firmware updating through USB
• Easy calibration procedure
• Comes standard with Type 1 / Class 1 (SB41) or Type 2 / Class 2 (SB42) measuring microphone; works with any 48 V XLR measuring microphone.

TECHNICAL SPECIFICATIONS FOR SB41

• Linear range of electronics (combined ranges) >110 dB
• Linear measuring range with included microphone: 30 to 128 dB.
• Type 1 / Class 1 Sound Level Measurements compliant with ANSI S1.4 and IEC- 61762-1:2014.
• Frequency weightings: A,C, Z; Time averaging and integration: Fast, Slow; Equivalent Continuous (EQ); Max Hold; Peak.
• RTA filter specs exceed class 1 requirements (IEC-61260- 1:2014)
• STI module fully compliant with IEC-60268-16 rev 4 (2011) and rev 5 (2020)

TECHNICAL SPECIFICATIONS FOR SB42

• Linear range of electronics (combined ranges) >110 dB
• Linear measuring range with included microphone: 30 to 122 dB.
• STI module fully compliant with IEC-60268-16 rev 4 (2011) and rev 5 (2020)
• Type 2 / Class 2 SPL measurements compliant with ANSI S1.4 and IEC- 61762-1:2014.
• RTA filter specs exceed class 1 requirements (IEC-61260:2014)