Installed Sound Solutions

Installed Sound & Evac Test Solution

Clarity of sound and intelligibility of speech are the most important factors for successful installation of audio-acoustic systems in large commercial spaces, multi-purpose public rooms, teleconference systems, auditoriums, airports, train stations and stadiums.

NTi Audio provides contractors and audio engineers with a comprehensive set of diagnostic and measurements tools. They are perfectly tailored for installing, commissioning and troubleshooting sound and audio systems in cinemas, studios, broadcast and fixed installations so that the conference PA system produces acceptable levels of intelligibility of speech, the background music is audible and at a pleasant level and, most critically, announcement and emergency messages are loud and clear wherever you may be located in the building.


  • Commissioning, verification, periodic performance checks and troubleshooting of electro-acoustic installations including 70/100V systems
  • Confirm compliance with system specifications and regulations such as IEC 60849, EN 54-24
  • Measure speech intelligibility STIPA in accordance with the IEC 60268-16 standard


  • Handheld and compact design for field applications
  • Stores all test results to SD Card for documentation
  • Improved efficiency with dedicated measurements utilizing user-defined start-up profiles and appending test results to previous data records
  • Calibrated audio and acoustic measurement system

XL2 with M4260 Measurement Microphone
XL2 Audio and
Acoustic Analyzer

Minirator MR-PRO
Minirator MR-PRO

Speech Intelligibility

The XL2 measures the intelligibility of speech in an installed environment and generates a measurement report. The measurement set provides you with detailed analysis of sound pressure level, frequency response, reverberation time, ambient noise and distortion, all of which influence speech intelligibility.

“What’s that hum? Why is there no sound?”

The Minirator signal generator and XL2 Analyzer are valuable instruments for fast troubleshooting of the audio signal path throughout the installation.
The MR-PRO verifies phantom power supply of microphones, checks XLR cables and measures the load impedance of 70/100 Volt speakers.

Polarity, Delay, Reverberation Time

Use the MR-PRO with the XL2 for an in-depth verification of the polarity - frequency relation for speaker cabinets or other multi-way systems. Configure your delay speakers and analyze the reverberation time RT60 to improve the sound quality and speech intelligibility.

Noise Curves and System Spectral Response

Generate pink noise with the MR-PRO and optimize the frequency response of your system with the XL2 Analyzer. Measure the spectral distribution of the ambient noise with the optional Noise Curve function to verify if the noise rating requirements are met.

Speech Intelligibility STIPA Measurement

Talkbox on Stand
NTi Audio TalkBox
With the TalkBox you can perform a complete end-to-end evaluation of the speech intelligibility STIPA from the talker’s microphone to the listener’s ears. The TalkBox is an acoustic signal generator for speech intelligibility measurements in evacuation and announcement systems.

Test, One, Two

You will often hear installation engineers repeating the phrase "test, one, two" while setting up microphones. They are not practicing counting; they are checking the frequency response of the microphone. The "uhn" sound of the word "one" produces a low vocal frequency, while the "t" sound in "two" produces a high vocal frequency. (Counting "three, four" adds no more value except perhaps to demonstrate that we installation engineers can, in fact, count past two.)
The NTi Audio TalkBox simplifies and improves the setup of microphones by generating a reference human speech signal or other standard audio test signals, so that all frequencies (not just the frequencies produced by "one, two") can be efficiently adjusted by a single person.
The TalkBox generates all test signals for professional conference room commissioning. Simply position the TalkBox at each speaking position.

Impedance Testing of 70/100V Systems

The Minirator MR-PRO measures the impedance and power rating of distributed speaker systems. Deviations from the expected result identify problems such as bad connections, incorrect tap connections or short circuits. Use the optional 70V/100V Protection Adapter for safe operation.

The impedance test supports the verification of distributed loudspeaker installations and shows detailed information of the connected load. The test result shows if the connected speaker system is in good order as well as the required amplifier power ratio. The power is automatically calculated by the measured impedance for 25 V, 35 V, 50 V, 70.7 V, 100 V, 140 V, 200 V systems.

      Minirator MR-PRO Impedance Detail       Minirator MR-PRO Power
                    Impedance and Phase                                    Apparent Power and Phase

Order Information

Exel Installed Sound Set

Exel Kit for Installed Sound

  • XL2 Audio and Acoustic Analyzer
  • STIPA Option for XL2
  • M4260 Measurement Microphone
  • Minirator MR-PRO Signal Generator
  • ASD Cable for XL2
  • Cable Test Plug (MR-PRO)
  • MR-PRO 70/100V Protection
  • 2x Mains Power Adapter
  • Exel System Case

Optional as required:

NTi Audio TalkBox

Acoustic Generator (STIPA Reference)

Spectral Limits Option

for Noise Curve Measurements

Get more Information

Buy at the web shop or contact NTI Americas .

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 Solutions for



Contact NTi Audio

NTi Audio Contact Americas  
Brian MacMillan
+1 503 684 7050

Customer Comments

Best Instruments for Audio
"In my opinion NTi Audio makes the best measurement instruments for audio industry. They are very comfortable to use and have high accuracy. I purchased XL2+M4260 set to apply them for my lab works, acoustics research and audio installation."
Alexander Kudriavtsev,
Starlingbox, Russia

For a better Sound

“If we could get more of the integrators in the region to use your kit, the world would be a better place! Well... at least it would sound better!”
Dave McMahon, dmc audio, UAE