Bedrock SB41/SB42 SoundBox
IoT Sound Level Meter & Noise Data Logger
A USB-controlled IoT sound level meter and noise data logger built on the same measurement platform as the handheld instruments. The SB41 is IEC 61672 Class 1 and the SB42 is Class 2. Both are operated over USB (Python API, Remote Display app, or USB audio streaming), measure SPL, LEQ/Ln statistics, octave bands, FFT, STIPA/STI and RT60, and log to 16 GB of internal flash.
About this product
The SoundBox is the SB41 and SB42 in a USB-controlled enclosure: the full measurement platform of the handheld instruments, built to run permanently and record to 16 GB of internal flash.
The Bedrock SB41 and SB42 SoundBox are professional IoT sound level meters and noise data loggers designed for system integrators, smart city deployments, and continuous environmental monitoring. Control remotely via API, deploy unattended, and stream real-time noise data to your monitoring platform.
IoT Sound Level Meter for Connected Noise Monitoring
Build professional noise monitoring networks with IEC-61672 Class 1 (SB41) or Class 2 (SB42) compliant sound level measurement. The SoundBox connects to any USB host—Raspberry Pi, industrial PLC, edge computer, or cloud gateway—streaming SPL, LEQ, octave band, and statistical noise data in real-time.
Continuous Noise Data Logger with 16GB Storage
Deploy unattended for long-term environmental noise monitoring. The internal 16 GB flash stores or buffers measurement data, including while the device is temporarily disconnected from its USB host; saved data is downloaded over USB when the host reconnects. Perfect for construction site monitoring, airport noise surveys, traffic noise assessment, and smart city sound mapping projects.
Complete Sound Measurement Platform
All measurement modules included from day one: SPL meter, LEQ/Ln statistical analysis, Real-Time Analyzer (1/1, 1/3, 1/6, 1/12 octave), full STIPA/STI speech intelligibility, RT60 reverberation time, building acoustics (SRI/STC), FFT analysis, and calibrated audio recording. No unlock fees. No subscription costs. The module set is the same as the i9's, so an integrator can prototype on a handheld and deploy on the SoundBox without discovering a difference.
Flexible API for System Integration
Our Remote Protocol Tool (API in Python) provides full programmatic control for automated test systems, IoT platforms, and custom monitoring applications. Use the Remote Display app for Windows-based operation, or USB audio streaming mode for high-quality acoustic input to your DAW or analysis software. Full API documentation is available on request — tell us what you are building and we will send it.
Designed in the Netherlands by Acoustic Measurement Experts
Every SoundBox is engineered by the team that invented the Speech Transmission Index. We build the professional noise monitoring tools we use ourselves—complete, fully-featured, no hidden costs.
Key Features
- IoT sound level meter with API control
- Continuous noise data logger (16 GB storage)
- Raspberry Pi and edge device compatible
- Real-time SPL/LEQ data streaming
- Class 1 (SB41) or Class 2 (SB42) IEC compliance
- Full STIPA/STI speech intelligibility included
- Unattended long-term noise monitoring
- All modules included—no unlock fees
Specifications
| SB41 Compliance | IEC 61672-1:2013 Class 1, ANSI S1.4-2014 Type 1 |
| SB42 Compliance | IEC 61672-1:2013 Class 2, ANSI S1.4-2014 Type 2 |
| STI Compliance | IEC 60268-16:2020 (rev 5), IEC 60268-16:2011 (rev 4) |
| RTA Filters | Exceed Class 1 requirements (IEC 61260-1:2014) |
| Microphone (SB41) | 1/2" prepolarized Type 1/Class 1, works with any 48V XLR mic |
| Microphone (SB42) | 1/2" Type 2/Class 2, works with any 48V XLR mic |
| Linear Range | >110 dB (electronics) |
| Measuring Range (SB41) | 30 - 128 dB with included microphone |
| Measuring Range (SB42) | 30 - 122 dB with included microphone |
| Frequency Weighting | A, C, Z |
| Time Weighting | Fast, Slow, Impulse, Equivalent Continuous, Max Hold, Peak |
| Internal Storage | 16 GB (15.8 GB available for data) |
| Connectivity | USB (data, power, remote control) |
| Power and Operation | USB-powered; no display and no internal battery — designed for permanent and semi-permanent installation under external power |
| Control Options | API (USB), Remote Display app (Windows), USB audio streaming |
| Modules | SPL, RTA, STIPA, Full STI, RT60, Statistical, LEQ logging, Building Acoustics, FFT, Oscilloscope, AC Voltmeter, THD+N |
Applications
Explore detailed guides for each application area
Smart city IoT noise monitoring
Continuous environmental noise data collection
Construction site noise monitoring
Airport and traffic noise assessment
Industrial noise compliance data logging
Automated acoustic testing and QC systems
Unattended long-term noise monitoring
What's Included
Complete kit includes: Rugged hardcase, windscreen, universal power adapter (international plugs), USB cable, calibration certificate, lanyard, a plethora of Excel calculation and reporting sheets, plus Bedrock Studio software. ISO17025 accredited calibration available as an option.
From measurement to report — Bedrock Elite Analyzer
Turn your SB41/SB42 SoundBox measurements into standards-anchored results and branded reports, on your Windows desktop.
- No serial needed to start — run every module in demo mode.
- Branded, standards-referenced PDF reports.
- No add-ons, no per-module fees.
Complete Your Setup with the BAC3 Class 1 Calibrator
For the SB41, which is Class 1 to IEC 61672-1, we recommend pairing with a Class 1 acoustic calibrator. The SB42 is Class 2; a Class 2 calibrator is sufficient.Regular field calibration ensures your measurements remain traceable and compliant with IEC standards.
- Class 1 to IEC 60942
- 94 dB and 114 dB reference levels
- ISO17025 accredited calibration available
- Compatible with 1/2" and 1" microphones
Extend Your Reach with Outdoor Monitoring
The BOMK00 outdoor kit transforms your measurement capabilities for sustained, unattended noise monitoring. Perfect for environmental assessments, construction site monitoring, and regulatory compliance surveys.
Week-Long Battery
Up to 7 days off-grid operation
Weatherproof Design
Rain, dust, and impact resistant
Remote Access
Bluetooth and WiFi connectivity
Solar Compatible
Extended deployment with solar panels
