Options for XL2 Analyzer

Extend your XL2 with more features to meet your needs. On this page you will find a list of all the available Options.

Also, here is a handy overview to compare what each Option can give you.

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

Extended Acoustic Pack Option

The Extended Acoustic Pack, when installed on your XL2, supports the daily tasks of acoustic consultants. It offers additional features for sound level logging and acoustic measurements, such as recording linear wav-files, percentile statistics, sound exposure level, 100 ms logging, event monitoring, reverberation time RT60 in 1/3 octave resolution, Zoom-FFT with 0.4 Hz resolution and many more.

  • SLMeter/RTA function
    • Recording of wav-files (24 bit, 48 kHz), a new wav-file is started after each hour (max. wav-file size 512 MB)
    • Percentiles for wide band and spectrum with flexible setting from 0.1% to 99.9%
    • Sound Exposure Level LAE
    • 100 ms logging
    • RTA logging of Lmin and Lmax
    • Event-triggered audio and data recording
    • Time weighting: Impulse (LxI, LxIeq with x= A, C, Z)
    • True peak level in 1/1 and 1/3 octave resolution
    • Clock-impulse maximum level (TaktMax) and values as specified in DIN 45645-1
    • Impulsiveness detection in accordance with BS4142:2014 and NordTest ACOU 112
  • FFT function
    • High-resolution Zoom-FFT with selectable frequency ranges and resolution up to 0.4 Hz in the range of 5 Hz to 20 kHz
    • Recording of linear wav-files (24 bit, 48 kHz)
  • RT60 function
    • Reverberation time RT60 in 1/3 octave resolution
  • 1/12 octave Spectral Analyzer
    • Recording of linear wav-files (24 bit, 48 kHz)

NTi Audio #: 600 000 339

XL2 Sound Level Meter

Speech Intelligibility STIPA Option

The XL2 Analyzer, with the STIPA Option installed, measures the speech intelligibility according to the latest revision of standard IEC 60268-16:2011 (edition 4) and older editions. It offers ambient noise correction and automated averaging for repeated measurements. The XL2 displays the speech transmission index (STI) and the common intelligibility scale (CIS), accompanied by the individual levels and modulation indices of the seven octave bands.

The measurement results are acquired from the dedicated STIPA test signal source:

  • NTi Audio TalkBox
    Acoustic signal generator, required for audio systems with voice microphones, thus measuring the complete signal chain.
  • Minirator MR-PRO
    Test signal generator, required for audio systems with line inputs
  • STIPA Test CD

NTi Audio #: 600 000 338

XL2 STIPA Analyzer

STI Reporting Tool

STIPA Reporting Tool

The STI Reporting Tool creates measurement reports according to the IEC 60268-16 and VDE0833 standards. The tool calculates the effect of the actual ambient noise caused by the public onto the measured speech intelligibility. Thus it provides you the expected speech intelligibility in STI or CIS during real-life emergency announcements.

The STI Reporting Tool is free to download at the XL2 Support website.

System Requirements:

  • PC running Windows XP, 7, 8 and 10
  • Excel 2010, 2013 or 2016 (32 bit or 64 bit)

Cinema Meter Option

An XL2 Analyzer, with the Cinema Meter Option installed, forms the dedicated solution for efficient calibration and repetitive verification of cinema loudspeaker systems in accordance with SMPTE ST 202:2010 and SMPTE RP 200:2012. An interactive assistant guides the user through the calibration and verification process. The M2211 Measurement Microphone with class 1 frequency response is recommended for accurate measurements in cinemas, as the specified tolerance bands are very tight.


  • Generate measurement templates including the X-curve fitting best to the chosen cinema size.
  • Calibration assistant for reference data recording of each channel as well as headroom tests
  • Averaging measurement results of different microphone positions
  • Verification assistant for periodic cinema measurements and comparison against the reference data

NTi Audio #: 600 000 379

User Manual

XL2 Cinema Meter

Spectral Limits Option

The Spectral Limits Option extends the XL2 function range in both, the sound and vibration mode. It adds noise curves, trace capturing, relative curve display and comprehensive tolerance handling for the FFT Analysis and high resolution spectral analysis up to 1/12th octave. The vibration mode is enabled upon installing the the vibration option.


  • FFT and 1/12 octave Analyzer
    • Capturing of multiple readings into the internal memory
    • Comparing measurement results against captures with relative or absolute curve display
    • Comprehensive tolerance handling with tolerance masks based on captures for passed/failed measurements
    • Export and import of tolerance and capture files
  • 1/12 octave Spectral Analyzer
    • High resolution RTA function 1/12 Oct + Tol
    • Selectable 1/1, 1/3, 1/6 and 1/12 octave resolution
    • Frequency band listening at rear speaker
    • Sound Mode: 11.5 Hz to 21.8 kHz
    • Vibration mode: 0.73 Hz to 1.36 kHz
  • FFT Analyzer
    • High-resolution Zoom-FFT with selectable frequency ranges and resolution up to 0.4 Hz in the range of
    • Sound mode: 5 Hz to 20 kHz
    • Vibration mode: 1 Hz to 20 kHz
  • Sound Level Meter
    • True peak level in 1/1 and 1/3 octave resolution
  • Noise Curves
    • In accordance with ANSI S12.2-2008, -1995 and ISO 1996

NTi Audio #: 600 000 376

XL2 Sound Level Meter

Vibration Option

The Vibration Option turns the XL2 Analyzer into a professional vibration meter with broadband measurements and spectral analysis in 1/3 or octave resolution. The XL2 Vibration Meter determines vibration acceleration, velocity and displacement with standard-compliant weighting filters in the frequency range from 0.8 Hz to 2.5 kHz. Detailed recording of measurement data and audio files allow for comprehensive evaluation and reporting. In addition, the XL2 Vibration Meter comes standard with an FFT analysis and an oscilloscope function. Selectable FFT frequency ranges from 1 Hz to 1.69 kHz allow a detailed examination of the measured vibrations.

The Spectral Limits Option adds functions to the Vibration Meter including a zoom FFT up to 20 kHz and a 1/12 octave band analysis from 0.73 Hz to 1.36 kHz. Also, it adds the ability to record reference spectra and set tolerances for pass / fail quality control measurements. The Remote Measurement Option allows the real-time acquisition of measurement data directly into a computer application via the USB interface. A documented command set is available.

The Vibration Option requires the new XL2 firmware V4.02 or higher. Its presently not supported by the XL2-TA running the latest type approved firmware V3.11.

NTi Audio #: 600 000 436

Vibration Option

Remote Measurement Option

The Remote Measurement option allows the real-time acquisition of XL2 measurement data directly into a computer application via USB. The option adds functionality to these NTi Audio ready-made computer applications:

  • For Live concerts - two additional functions are enabled in the Projector PRO software; the "XL View" for large screen dB level display, and "Sound Level Predictor" that indicates the headroom for the next few minutes.
  • For Building Acoustics - adds a real-time acquisition facility to the Sound Insulation Reporter software. To enable the import of measurement data into the XL2 Sound Insulation Reporter software the connected XL2s also require an activated Sound Insulation Option.

Alternatively you can write your own application, e.g. with MS Excel or LabView. This allows you to program your unique measurement applications for sound level monitoring or automated measurements. A documented command set for data retrieval via USB is available. The following XL2 measurement functions are supported:

  • Sound level meter and spectrum analyzer SLMeter/RTA
  • Vibration Meter VibMeter/CPB
  • FFT analyzer
  • RT60 reverberation time
  • Audio analyzer RMS/THDN
  • High resolution spectral analyzer 1/12 Oct + Tol

NTi Audio #: 600 000 375

User Manual


XL2 Data Explorer Option

The Data Explorer Option, when installed on your XL2, allows you to import logged sound level measurement data from your XL2 into the Data Explorer software, a PC-based software application with a powerful data processor for easy and fast analysis of noise monitoring data.

Visualize, analyze and control millions of data points with this tool that is dedicated to acoustic consultants and noise measurement professionals. It provides a convenient way to view and manage your data and quickly create customized reports.

NTi Audio #:

  • XL2 Data Explorer Option: 600 000 430
    (permanently installed option in XL2)
  • Data Explorer 365: 600 000 431
    (annual subscription service)

Read more ...

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, Impact and Facade sound insulation measurements. Designed for acoustic consultants, this comprehensive tool uses data gathered by the XL2 Acoustic Analyzer, and quickly returns graphical analysis for all measurement positions.

XL2 Sound Insulation Reporter Results

NTi Audio #:

  • XL2 Sound Insulation Option: 600 000 432
    (permanently installed option in XL2)
  • Sound Insulation Reporter 365: 600 000 433
    (annual subscription service)

Read more ...

XL2 Sound Power Option

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

XL2 Sound Power Reporter is a PC-based software application that provides comprehensive reports for sound power measurements. Designed for industrial professionals, this comprehensive tool uses data gathered by the XL2 Sound Level Meter, and quickly returns graphical analysis of all measurement positions.

XL2 Sound Power Reporter Results

Features of the Sound Power Reporter software:

  • Visualization of all measurement
  • Customized Reporting
  • ISO 3741, ISO 3744, ISO 3746
  • ANSI-ASA S12.51, S12.54, S12.56

NTi Audio #:

  • XL2 Sound Power Option: 600 000 434
    (permanently installed option in XL2)
  • Sound Power Reporter 365: 600 000 435
    (annual subscription service)

Read more ...

XL2 Projector PRO (free download)

The Projector PRO software displays the XL2 screen in real-time via USB on the connected Windows or Mac computer. The software toolbar enables control of the XL2 with the mouse and keyboard. The background color turns from green to red according to the user-defined limits.

The “XL View” and the “Sound Level Predictor” display extend the XL2 Projector PRO for live sound monitoring applications.

  • The “XL View” window presents sound levels in large size on the connected computer screen. Users may select to view one, two or three sound pressure levels. Exceeding levels are presented with a pre-warning amber or alarming red color.

  • The “Sound Level Predictor” visualizes the level history of the current measurement interval and indicates the headroom for the actual measurement period or the next few minutes. Green bars confirm that the present level is well below limits. Red bars are a call to action to reduce the sound level at the mixing desk. This allows the FOH engineer to optimize dynamic passages of the band for maximum audience satisfaction while still remaining within the legal limits.

Additionally the Projector PRO software offers the ability to retrieve measurement data from the XL2 without interruption to the measurement process. The entire file system of the XL2 is available while the XL2 is measuring.

The “XL View” and the “Sound Level Predictor” require that the Remote Measurement Option be installed on the XL2.

System Requirements:

  • Windows 7, 8, 10 or higher
  • Mac OS 10.8 or higher

Download Projector PRO Software

Sound Level Reporting Tool (free download)

Get your full report ready within minutes of completing the measurement. Just open the Sound Reporting Tool with Microsoft Excel and load the data file from the XL2 Sound Level Meter. The tool extracts all available data such as measurement date, start time, etc. and generates sound level charts. The entire measurement period is graphed with the relevant sound levels and legal limits where appropriate, allowing you to visualize the sound levels at a glance.

Sample Live Sound Report

Sound Level Meter Report Demo 1

Sample Graph from the Report

Sound Level Meter Report Demo 2

Download free Reporting Tools

Get more Information