NTi Audio

Data Analysis for XL2 Analyzer


The XL2 stores all data and audio onto the SD card for direct transfer to the computer. Audio data is stored as .wav files. Data reports and log files are stored in plain text format, which can be opened with any text editor (Notepad, Wordpad, etc). The data is tab-delimited, so dropping the .txt file into a spreadsheet application will conveniently show the results in columns.

Furthermore a series of free MS Excel application templates provide a convenient way to view the measurement results of specific tasks and create simple reports.

For the most comprehensive analysis of logged noise monitoring data, use the XL2 Data Explorer software.

Application Direct Data Access
Excel Templates

XL2 Data Explorer Software
Sound Level Meter

  • General sound level measurements
  • Long-term noise monitoring
    (Excel template suitable for up to approx. 20,000 log lines)
  • Audio data playback
    (Data Explorer offers playback aligned to graphs)
  • Analyze marked time periods
- -
  • Mark graphs to exclude time periods
  • Live sound level legal compliance
    (Germany, Austria, Switzerland, Belgium, etc)
- -
  • Post-calculation of day/night-level and percentiles
Real Time Analyzer

  • Spectral noise monitoring
  • Analyze marked time periods
- -
  • Mark graphs to exclude time periods
- -
FFT, RT60, Noise Curves,
1/12 Octave Analysis

Speech Intelligibility STIPA

  use any text editor Download here free templates
Download software demo here

XL2 Data Explorer

XL2 Data Explorer is a PC-based software application with a powerful data processor for easy and fast analysis of sound level measurement 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.

XL2 Data Explorer

  • Data visualization
  • Fast zoom and pan
  • Audio playback synchronized to graph
  • Markers with on-the-fly calculation
  • Visualization of recorded events
  • Customized reporting

Introduction to XL2 Data Explorer


Chart View

The chart view shows the logged levels, markers, audio player, spectrogram and frequency spectrum.

XL2 Data Explorer

Select Multiple Levels

A drop down menu allows you to select the individual levels. All selected noise levels are displayed in the chart.

XL2 Data Explorer

Zoom and Pan

Extremely fast zoom and pan response over the entire data log period, even for very large data sets.

XL2 Data Explorer


Mark areas of interest in the graph with a text description. Choose "Include Markers" for calculations of contributions by specific noise sources, enabling simple source ranking. Eliminate unwanted noise sources from your final result using "Exclude Markers". The marked areas are summed and appear in your report.

XL2 Data Explorer

Level Statistics

XL2 Data Explorer offers a detailed statistical analysis of the logged sound level measurement data. The percentiles can be calculated for wide band levels as well as 1/1 and 1/3 octave band levels. Data Explorer calculates the level statistics of the complete measurement or marked time periods as part of the post-measurement analysis. Excluded periods are considered.

XL2 Data Explorer Level Statistics 100Hz


The XL2 Data Explorer calculates the levels Lden, Ldn, Lday, Levening, Lnight with individual weightings (penalties).

XL2 Data Explorer

Result View

The tabular representation shows all results in a structured and intuitive way, detailing the original recorded results, summaries of the areas marked for exclusion and inclusion, and the final result. The results can be exported to EXCEL.

XL2 Data Explorer Audio


Audio recordings are time-aligned to the graphs. Listen to the recordings for a more objective analysis of the noise sources with manual or automatic gain control.

XL2 Data Explorer Audio


Complete your professional reports with customized titles and comments. The XL2 Data Explorer automatically adds relevant header data such as the measurement date, calibration information, instrument setup etc., and compiles a tailored report. Simply add your own company logo.

XL2 Data Explorer

Get the Data Explorer Software

Data Explorer Option

The Data Explorer Option enables the import of measurement data into the XL2 Data Explorer software. This option needs to be installed in the XL2 Sound Level Meter. XL2 customers may then also import data which has been recorded prior the installation of the Data Explorer Option.


XL2 customers may download a demo version of  the Data Explorer PC software for evaluation at the support page. It includes various demo projects.


The XL2 Data Explorer 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 XP, Vista, 7, 8 Pro and requires a video board with a shader-model 3.0 or higher (DirectX 9.0 c).

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

Get more Information

I am interested: Contact NTI Americas

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.

Demo report: (click to enlarge)

Sound Level Meter Report Demo 1 Sound Level Meter Report Demo 2


Please visit the  XL2 support page  to download the required templates.


Sound Level Meter
Real Time Analyzer
Audio Analyzer
FFT Spectrum Analyzer
STIPA Analyzer

Contact NTi Audio

NTI Americas Inc.
Tigard, Oregon
Thomas E. Mintner
+1 503 684 7050

Customer Comments

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