Take your noise monitoring programme to the next level with Quantum Indoor and MyCirrus

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 occuring; 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. It provides a constant ear to the ground, 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.

Think outside the box with our comprehensive indoor noise monitoring solution

You can use a single Quantum Indoor monitor or link several units to create a cloud-connected network of noise monitors, allowing you to get the full picture of the impact noise is having on your site.

Using Quantum portal, you can see a live noise map using the Floor Plan view, perfect for seeing noise levels where they're occuring and providing context for your measurement data. Thr floor plan allows you to respond in real-time to noise events and identify potential areas of concern before they pose significant risks.

Each Quantum Indoor unit communicates with the MyCirrus cloud platform, sending noise data to it every second. This data is then displayed in the live feed on Quantum portal, allowing you to view it remotely around the clock, from any device, anywhere in the world.

If you're using set measurements, you can view your time history and octave band data, which is stored on MyCirrus, along with any audio data recorded during the measurement period.

You can set up several noise-based event triggers for audio capture and real-time alerts, based on your own set of conditions for acceptable noise emissions. Notifications can be set-up to be sent via automated email, SMS and push notifications through our dedicated smartphone application, allowing for noise issues to be controlled before a non-compliance condition arises.

Audio recordings are made when a noise event is triggered, so you can review and identify the noise source easily. Each recording can be played back from within the Quantum portal or downloaded to your PC/laptop for more in-depth analysis.

Quantum Indoor captures both 1:1 and 1:3 octave band data alongside all other noise measurement parameters, which is stored in and accessible through the Quantum portal. This information allows you to analyse your noise data in greater detail to better understand the nature of the noise and its potential implications.

You can use the frequency analysis screen in Quantum portal to view your the frequency data in exquisite detail. Explore each peak and trough in a fully navigable 3D model.

From within the Quantum portal, you can create detailed noise reports based on the data captured by your Quantum Indoor units. Several standard reports are available from the Quantum portal, with further user-definable options are planned for a future release. You can also export your data to our incredibly powerful licence-free reporting software, NoiseTools, for further in-depth analysis of your noise data. You are also able to customise your reports with your organsation's branding for a more tailored and professional look.

  • Class 2 indoor noise monitor to IEC 61672-1: 2013
  • Class 1 variant avaiable
  • Cloud connectivity to Cirrus Research’s unique MyCirrus cloud platform
  • View live measurements from multiple Quantum units simultaneously
  • Upload site maps and / or site plans to see all your connected devices
  • 1:1 and 1:3 octave band filters for detailed environmental analysis
  • Schedule your measurement times and set repeat measurement durations of 5, 15 and 30 minutes or 1 hour
  • Real-time SMS, email, webhook and push notification alerts based on user-defined noise level triggers
  • Upload and store historical noise data
  • Export historical data into Cirrus Research’s NoiseTools software for further analysis and reporting
  • Over-the-air updates
  • Connectivity via Ethernet
  • Power over Ethernet
  • Flexible cloud subscription levels for each individual unit on your Quantum network
  • Electronic calibration certificates available through MyCirrus

Available features will depend on the level of subscription you choose.

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

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


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 quality

Standard (16bit/16kHz)

High (24bit/48kHz)


127 x 360 x 66mm




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


4GB standard - 30 days of measurement data or 24 hours of standard audio


PoE IEEE 802.3af-2003 37V-57V

Power consumption

Approx. 5w

Operating conditions


-10°C to +50°C (operating)

-20°C to +60°C (storage)


Up to 95% RH non-condensing

Network connections


Dual-band WiFi (2.4GHz & 5GHz)


No fixed fees and no set up charges!

We offer subscription packages that are flexible to fit in with your noise monitoring programme and your preferred level of usage. With our flexible plans, you have the ability to change your subscription up or down on a monthly basis.

MyCirrus is suitable for all our Quantum noise monitoring devices, and can also be used with other instruments such as our Environmental Noise Measurement Kits.

Subscription tiers:

  • Standard subscription - supplied as standard for 1 year
  • Pro subscription - upgrade to include more features
  • Data retention only - secure storage for the data on our cloud storage system (only available after the first year)

Click here to access MyCirrus.

Product Datasheets

Product Ordering Codes

Below is a list of the ordering codes for the Quantum Indoor noise monitors and their associated accessories. Please quote the ordering code when requesting a quotation.

Description Code
Class 2 Quantum Indoor noise monitor (EMEA, APAC) CR:900
Class 1 Quantum Indoor noise monitor (with microphone preamplifier extension cable) CR:901
Quantum Indoor mounting clamp CM:900-1
Quantum Indoor tripod mounting bracket CM:901
Quantum Indoor microphone windshield UA:900
5m microphone preamplifier extension cable (CR:901 only) ZL:205
10m microphone preamplifier extension cable (CR:901 only) ZL:210

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