NTi Audio
Building Acoustics Solutions

Building Acoustics Test Solution

The XL2 Analyzer provides the handheld solution for airborne and structure-borne sound insulation measurements, speech intelligibility and room acoustics. Noise levels and reverberation time are measured in accordance with ISO 16283 and ISO 140.

The XL2 offers detailed evaluation of the acoustic room response with spectral measurements with up to 1/12 octave resolution and a high resolution Zoom-FFT. The wav-file recording support the measurement of the impulse response for offline calculations.


  • Air-borne and structure-borne sound insulation measurement between rooms or indoor-outdoor areas
  • Confirm compliance in accordance with ISO 16283 and ISO 140
  • Impact noise measurements
  • Qualification of speech intelligibility STIPA
  • Architectural and room acoustic measurements


  • Handheld and compact design for field applications
  • High resolution wav-file recording in 24 Bit / 48 kHz format to internal SD Card
  • Improved efficiency with dedicated measurements profiles
  • Calibrated acoustic measurement system for traceable measurements
  • No cable required between sending and receiving room due to separate devices

XL2 Measurement Functions

XL2 with M4260 Measurement Microphone

XL2 Audio and
Acoustic Analyzer

Sound Pressure Level SPL

The XL2 measures the sound insulation between rooms or indoor-outdoor areas. The impact sound insulation, e.g. footsteps, is measured by using a tapping machine. The level difference between two rooms might be corrected with the influence of the background noise in the receiving room.

Real Time Analyzer RTA

The real time analyzer measures the actual acoustic spectrum for sound insulation verification depending on the frequency. The sound insulation is measured at different room positions in 1/1 or 1/3 octave band resolution. The averaged result provides a single number insulation index.

RT60 Reverberation Time

The level difference between two rooms needs to be corrected with any influence of the reverberation time in the receiving room. The reverberation time measurement in 1/1 or optional 1/3 octave resolution offers automated triggering for repeated tests using an impulse signal or gated pink noise as signal source.

Speech Intelligibility STIPA (optional)

The XL2 measures the speech intelligibility of public announcement systems according to IEC 60268-16.

XL2 Sound Insulation Option

The Sound Insulation Option enables the import of measurement data into the XL2 Sound Insulation Reporter software.

XL2 Sound Insulation Reporter is a PC-based software application that provides all the standard reports for Airborne and Impact sound insulation measurements. Designed for acoustic consultants, this comprehensive tool uses data gathered by the XL2 Sound Level Meter, and quickly returns graphical analysis of all measurement positions.

XL2 Sound Insulation Reporter Results

Features of the Sound Insulation Reporter software:
  • Airborne Sound Insulation
  • Impact Sound Insulation
  • Facade Sound Insulation
  • Visualization of all measurement
  • Customized Reporting
  • Conforms with standards ISO16283, ISO140, ISO717, Document E, ASTM E336, ASTM E413, ASTM E1007, ASTM E989

NTi Audio #:
  • XL2 Sound Insulation Option: 600 000 432
    (permanently installed option in XL2)
  • Sound Insulation Reporter 365: 600 000 433
    (annual subscription service)
Product Data
User Manual

Type Approval Option

The Type Approval Option, when installed on your XL2, upgrades the instrument to the XL2-TA, the sound level meter for certified measurements. The XL2-TA, together with the M2230 microphone and Shroud jacket, forms a type-approved sound level meter offering class 1 performance in accordance with IEC 61672:2014, IEC 61260:2014, ANSI S1.4:2014 and ANSI S1.11:2014 standard.

Type approved sound level meter configuration:
  • XL2-TA Sound Level Meter (XL2 with Type Approval Option installed)
    • Firmware V3.11
    • Optional: Extended Acoustic Pack Option
    • Optional: XL2 Input Keypad
  • M2230 Measurement Microphone
  • Shroud MXA01

XL2-TA Type Approval Certificate

Minirator MR-PRO Functions


Signal Generator

The Minirator MR-PRO generates wide-band or band-limited pink noise for sound insulation, absorption, privacy and articulation index measurements.

The following test signals support your applications:
  • 32 Hz - 16 kHz in individual octave bands
  • 20 Hz - 20 kHz in individual third-octave bands

Further customized wav-files and the STI-PA test signal are available.

Acoustic Test Signal Generator

Talkbox on Stand
NTi Audio TalkBox
The TalkBox is an acoustic signal generator for speech intelligibility measurements in evacuation and announcement systems.

It simulates a human talker (60 dBA @ 1 meter according to IEC 60268-16) for measurement applications, such as in classrooms.

Order Information

Exel AVI-Installation Set

Exel Building Acoustic Kit

  • XL2 Audio and Acoustic Analyzer
  • Extended Acoustic Pack for XL2
  • Sound Insulation Option for XL2
  • M2230 Measurement Microphone
  • Minirator MR-PRO
  • ASD Cable for XL2
  • 2x Mains Power Adapter
  • Exel System Case

Optional as required:

Dodec Speaker Set

omnidirectional test signal source

Type Approval Option for XL2

for type approved measurements and certification

Precision Calibrator

for user calibrations

Get more Information

Buy at the web shop or contact NTI Americas .

Get the Sound Insulation Reporter Software

Sound Insulation Option

In order to import data from your XL2 Sound Level Meter to the Sound Insulation Reporter PC-Software, the Sound Insulation Option needs to be purchased and installed on each XL2 Analyzer that will use it. Data which has been recorded prior the installation of the Sound Insulation Option may then also be imported. The Sound Insulation Reporter software can then be installed on an unlimited number of computers in order to analyze this imported data.

Sound Insulation Reporter 365

An annual subscription service is offered as an alternative to the Sound Insulation Option. The purchase of a Sound Insulation Reporter 365 subscription allows the unlimited import of measurement data from one XL2 Sound Level Meter into the Sound Insulation PC-Software for a period of one year.


Contact NTi Audio for the Sound Insulation Reporter PC software with demo data here.


The Sound Insulation Reporter software can be installed on multiple computers. This provides consultants with the freedom to distribute their measurement projects among team members and clients.

Technical Requirements

The software is compatible with Windows Vista, 7, 8.x, 10.

Other free reporting tools are offered for download at the XL2 support page.

Reference Customers

2Oscars Kinotechnik • A&T Trade • ABB Alstom• Apple Sound Ltd. • Audix Systems • Bosch • Bose • BP • CCTV • Cirque du Soleil-Mandalay Bay • Cisco • City of Edmonton • deciBEL • Deutsche Bahn • Disneyland Scientific Systems • Doppler Acoustics • DreamWorks Animation • EnBW Kernkraft GmbH • Ericsson AB • European Commission - DG JRC • Ford Audio Video • G+M Audio • Gade & Mortensen  • Akustik A/S • Gansu Tianxing Rare Earth Functional Materials Co. Ltd • Google • Gulf Security Equipment Co. • HafenCity Universität Hamburg • Hamann Media Tec GmbH & Co KG • Honeywell • HP Sound Equipment SRL • IEC • Innotronic of Scandinavia ApS • Inspire Tech Ltd • ISO-Audio • Izotop Service Sp. z o.o. • Juka Lab • Kinoton Korea, Inc. • KKL Leibstadt • König Audio-Video-Technik GmbH • Messe Frankfurt Venue GmbH • New York City Transit • Overtron Light & Sound • PKE Electronics AG • Qatar Olympic Committee • Quantum Technologies, Inc. • Reuter Associates LLC • Sandia National Laboratory • Siemens • Skywalker Properties Ltd. • SNCF - French national railway company • Soundzipper • Sydney Trains • Technicolor • TOA Corporation UK Ltd • Trondheim Lyd Lysverket AS • TüV Nord Systems GmbH & Co.KG • TüV Süd Industrie Service GmbH • Tyco Fire & Security Spa • Verizon • Walt Disney World • WSP Group

more ...


Test Solution

Contact NTi Audio

NTi Audio Contact Americas  
Brian MacMillan
+1 503 684 7050

Customer Comments

I Love It
“The XL2 is currently the world’s most versatile hand-held acoustic and audio analyser. I can do so much with it, and just love it! And in many ways, the associated Data Explorer software is much more versatile and easier to use than other leading industry equivalents.”
Glenn Leembruggen,
Acoustic Directions
, Australia

Very Simple to Use
"I must say that the instrument and the software are brilliant, and very simple to use, even for an old fogey like me."
Owen Clingan, UK

Better price with more versatility
"I am happy that you keep on developing new applications and uses for the XL2, it is quite a convenient and powerful tool. In my opinion it is a serious competition for the traditional sound level meters at a better price and with more versatility. The Type Approval is an important step forward in the acceptation of the system; even in situations where type approval is not really needed, it helps avoiding discussions on the validity of the measurements."
Ben Kok, www.benkok.com, Netherlands

XL2 Data Explorer Software
"With regards to analyzing the recorded noise data: The idea of hovering over the marker text or locking the set of them is absolutely brilliant for assessing the tonality of a marked section. I could not have thought of a better system. And the percentile calculator letting you choose any marker, filter band or level parameter is just perfect."
Jason Dixon, www.instrulabs.com.au, Australia