Soft dB · Class 1

MEZZO Precision Microphone

Class 1 precision microphone with built-in DSP that turns a Windows tablet or laptop into a sound level meter and real-time analyser (SLM, RTA and FFT).

MEZZO from Soft dB (Canada) is a Class 1 precision measurement microphone with a DSP built into the unit, which processes the signal in real time. It connects to a Windows tablet or laptop by USB, so the computer's large screen, storage and processing power are used for display, recording and analysis. Together with the MEZZO software, the system complies with IEC 61672 (2013) Class 1. The Noise Analyzer module (sound level meter, real-time analyser and FFT) is included, and further modules can be added for long-term noise monitoring, building acoustics and waveform recording with post-processing.

Key features

IEC 61672 (2013) Class 1 with MEZZO software
Built-in DSP for real-time processing
Works with any Windows tablet or laptop over USB
Noise Analyzer (SLM, RTA and FFT) included
1/1, 1/3 and 1/24 octave real-time filters and FFT
Optional Noise Monitor, Building Acoustics and Waveform Recorder modules
USB powered, no batteries needed

Downloads

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Noise Analyzer (included): SLM, RTA and FFT

Everything needed for everyday sound level measurement and spectrum analysis: 1/1, 1/3 and 1/24 octave real-time filters and FFT, with a large, clear screen that is easy to read. The interface is designed for touchscreens, with automatic on-screen keypads, and uses class 0 digital filters with 64-bit processing for high precision.

Noise Monitor (optional)

For remote noise monitoring stations: four interval periods (1 s to 24 h), audio recording (MP3 or WAV) and camera snapshots on trigger or periodically, weather station and solar power monitoring, email or SMS alerts on noise exceedance or power loss, and FTP data transfer.

Building Acoustics (optional)

For architectural acoustics: room noise (NC, RNC, RC, NR), reverberation time (T10–T30, ISO 3382-2), airborne sound insulation (ISO 717-1, ASTM ASTC/NIC) and impact sound (ISO 717-2, ASTM FIIC). All measurements and reports are kept in one project file, with on-site reports so no measurement is forgotten.

Waveform Recorder (optional)

Records sound and vibration signals for advanced analysis, with post-processing tools including time history, FFT spectrum, fractional octave spectrum, statistics, FRF and waterfall.

Specifications

MICROPHONE UNIT
Microphone	BSWA MPA221 (Class 1, 1/2 inch, 50 mV/Pa) or BSWA MPA225 (Class 2, 40 mV/Pa)
Connector	SMB
Signal conditioning	IEPE
Peak maximum level	Low range 112 dBpk, High range 126 dBpk
Noise level	Low range 22 dBA / 20 dBC / 25 dBZ; High range 32 dBA / 30 dBC / 35 dBZ
Under-range limit	Low range 32 dBA; High range 39 dBA
Input range	Low 0.42 Vpk, High 2.1 Vpk
Maximum sampling rate	48 kHz
Communication	USB 2.0 (Mini-B)
Power	USB powered, max 0.35 W
Dimensions	230 × 32 × 23 mm
NOISE ANALYZER MODULE (INCLUDED)
Displays	live and overall
Spectra	1/1 octave 16 Hz–16 kHz, 1/3 octave 12.5 Hz–20 kHz, 1/24 octave 11.4 Hz–22.1 kHz, FFT DC–24 kHz (Leq)
Time weightings	Slow, Fast or Impulse
Frequency weightings	A, C and Z
Metrics	Lmin, Lmax, LN%, Leq, Lpeak (spectrum and global)
Instant rate	50 ms
Standards	IEC 61672-1 (2013), IEC 61260 (2014), ANSI S1.4 (2014), ANSI S1.11 (2014)
Computer	Windows, 1.2 GHz CPU, 2 GB RAM minimum
KIT CONTENTS
Included	MEZZO unit, IEPE microphone, Soft dB calibration certificate, USB cable, windscreen, hard carrying case