Remote Noise Monitoring

Cloud-based noise monitoring for any indoor application

Quantum Indoor is a powerful noise monitoring solution with built-in cloud connectivity, perfectly suited for unattended indoor noise monitoring across a range of applications. Quantum Indoor can be used for: long-term occupational noise monitoring; identifying the source and type of noise that is occurring; and highlighting where noise control measures are required.

Quantum Indoor is the perfect complementary solution to any existing noise monitoring regime as it offers all the freedom and benefits that come with remote outdoor noise monitors, but specifically designed for an indoor application. Constantly capturing and storing noise data on the MyCirrus cloud platform for you to access whenever you need it. You can also set up comprehensive event-based triggers to capture audio recordings and send alerts to users, allowing you to react to and control noise events in real-time.

Quantum Indoor is available with flexible subscription plans, allowing you to increase the amount of data you can store as well as enhancing the functionality of your Quantum noise monitoring network.

  • Measures everything you need for comprehensive indoor noise measurements
  • Sends all that data it captures directly to Cirrus Research's own cloud platform, allowing you to view live noise measurement information wherever you are, whenever you need it
  • View and analyse historic data and create detailed reports, directly from the MyCirrus cloud platform
  • Class 2 to IEC 61672-1: 2013, with a Class 1 version available
  • Real-time notifications via text message and email, or through the dedicated MyCirrus smartphone mobile applications
  • Small and discreet design makes it perfect for installation in any indoor setting


Applicable standards
  • IEC 61672-1: 2013 (Class 1 - CR:901)
  • IEC 61672-1: 2013 (Class 2 - CR:900)
  • IEC 61260: 1995 (1:1 and 1:3 octave band filters)
  • ANSI S1.4 - 1983 (R2006)
  • ANSI S1.43 - 1997 (R2007)
  • ANSI S1.11 - 2004 (1:1 and 1:3 octave band filters)
  • EN 61000-6-3: 2007+A1: 2011
  • EN 61000-6-1: 2007
Microphone MK:224 pre-polarised
Measurement range 20 to 140dB RMS in a single range
Noise floor
  • <19dB(A) Class 1
  • <22dB(A) Class 2
Frequency weightings
  • RMS & Peak: A, C & Z measured in parallel
  • 1:1 octave bands: 31.5Hz to 16kHz
  • 1:3 octave bands: 6.3Hz to 20kHz
Time weightings
  • Simulatenous Fast, Slow and Impulse
  • Time history data rates
  • 10ms, 100ms, ½ sec, 1 sec
Live data refresh rate 1 sec
Live data view
  • Noise at work (LAF, LAeq & LCPeak)
  • Environmental (LAF & LAeq)
  • Custom (LAeq, LCeq, LZeq, LAFMax, LASMax, LCPeak & LZPeak
Measurement control User-definable scheduled measurements & user-selectable 5min, 15min, 30min, 1hr repeat timers
Stored values
  • LAeq, LCeq, LZeq, C-A, LAE, LEX8, LAFMax, LASMax, LCPeak, LAF1, LAF5, LAF10, LAF50, LAF95, LAF99, LAeqT1 & LAeqT2
  • 1:1 octave bands: 31.5Hz to 16kHz
  • 1:3 octave bands: 6.3Hz to 20kHz
  • Time history of 1:1 & 1:3 octave bands
  • Audio
Audio quality
  • Standard (16bit/16kHz)
  • High (24bit/48kHz)
Dimensions 127 x 360 x 66mm
Weight 1.2kg
Integrators User-selectable dual integrators: OSHA HC, OSHA PEL, MSHA HC, MSHA PEL, ACGIH, Custom A & Custom B
Moving average User-selectable: 5 min, 15min, 30min, 60min
  • DIN rail (standard)
  • Wall mount
  • Pole mount
  • Tripod mount
Memory 4GB standard - 30 days of measurement data or 24 hours of standard audio
Power PoE IEEE 802.3af-2003 37V-57V
Power consumption Approx. 5w
Operating conditions
  • Temperature
    -10°C to +50°C (operating)
    -20°C to +60°C (storage)
  • Humidity
    Up to 95% RH non-condensing
Network connections
  • Ethernet
  • Dual-band WiFi (2.4GHz & 5GHz)
  • Bluetooth




  • Factories
  • Warehouses
  • Music venues
  • Theatres
  • Stadiums
  • Hospitals
  • Educational establishments
  • Offices and call centres

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