AUDIO & ACOUSTIC MEASUREMENT SOLUTIONSXL2 HANDHELD
Made in Switzerland

AUDIO AND ACOUSTIC ANALYZER

SOUND LEVEL METERS P E C T R U M A N A LY Z E R
S T I P A A N A LY Z E R
A U D I O A N A LY Z E R
V I B R AT I O N M E T E R

www.nti-audio.com

XL2 – Effortless. Powerful. Uncompromising.

Many Functions – Ready for any Challenge
As a measurement expert, you will encounter different and sometimes demanding challenges.
The XL2 supports you with many functions and in a wide range of applications. Even in its
standard configuration, this precision device offers a wide range of analysis options. It contains
all the functions for sound level measurement including a spectral display, level and audio recording, and limit value visualization. For setup and troubleshooting of sound installations, alevel and frequency measurement with harmonic distortion analysis is available. Also, speakers
and cables can be measured for correct polarity and delay times.
Advanced applications such as speech intelligibility, vibration analysis, reverberation, soundinsulation, etc. can be licensed on the same device if required. Thus, the device grows withyour needs and minimizes the cost of future investments.

Switch on. Measure. Analyze.
Three seconds after switching on, the meter is ready to measure. The intuitive navigation suits
professionals as well as beginners. Simply choose a predefined profile and adjust the measuring
parameters as you need. The XL2 provides an extensive range of measuring functions.

2One Device – Many Applications
The XL2 is a powerful Sound Level Meter, a professional Acoustic
Analyzer, a precise Audio Analyzer, and a substantial Vibration Meterin one unit. Simple operation and plenty of functions distinguishes
this quality Swiss product.

Precise Results. Simple Operation.

The Applications
Room & Building Acoustics

Evacuation / Installed Sound· Reverberation RT60
· Airborne Sound Insulation· Impact Sound Insulation· Noise Curves· Alarm Limits STIPA· Speech Intelligibility· Impedance Measurement(MR-PRO)

Noise Measurement

Live Sound· Unattended Noise Monitoring· Tonal and Impulsive Noise· Rating Level· Noise at Work

· Sound Level Monitoring· Audio Measurements (THD)· Measurement Reports

Vibration Measurement

Quality Control· Acceleration· Velocity· Displacement· Spectral Representation· Spectral Analysis· Pass/Fail Testing· Remote Control

XL2 Sound Level Meter, Audio and Acoustic Analyzer

3

Live Sound
Made by Professionals for Professionals

Live Sound – Level Monitoring
As long as the sound is good and the show entertaining, live sound events can be enjoyed.
However, the sound level must always be below the legal limits in order to avoid possible hearing
damage to the audience and to not disturb the neighbors. The standard XL2 Sound Level Meter
offers this functionality.

Keeping Below the Legal Limits
The pre-defined profiles in the XL2 Sound Level Meter make it easy to comply with the legal
limits. Switch on the device, press start - done! The XL2 measures and stores the required
levels and informs the user via a tri-color LED or external lights whether the current soundlevel is within the allowable range. At the same time, if necessary, the device records the entire
event in a compressed WAV file.

Professional Reports
Load the measurement data into the NTi Audio
Measurement Report Tool, add your logo andprint. Compare the displayed levels with theaudio recording for a deeper analysis of theevent (for example, loud applause that triggered
a level violation).

Projector PRO Software for Visualisation of Levels and Limits

4

Voice Evacuation Systems

Speech Intelligibility STIPA in Evacuation Systems
The XL2, with the STIPA Option, measures the speech intelligibility of the system, taking into
account the background noise. Reporting tools that read the XL2 data directly, are available
to produce documentation that serves as a basis for the acceptance of such announcement
systems.

Reverberation as a key to Good Speech Intelligibility
Large venues, such as railway stations, can have a naturally long reverberation time, which
can have a negative effect on speech intelligibility. Measuring reverberation time with the XL2
is effortless and provides a solid basis for the optimal design of a voice evacuation system. An
XL2 RT60 measurement is automatically triggered by either an impulse or gated noise soundsource.

Impedance Measurement shows Wiring Defects and Reserve Capacity
In distributed audio systems (100V systems), an impedance measurement with the MR-PRO Audio
Generator helps to quickly and easily determine if all loudspeakers are in working order and correctly wired. If the installed system needs to be expanded, the impedance or power measurementby the MR-PRO helps to determine the reserve capacity available on the line of speakers.

Voice Paging Level
Establishing an appropriate level for evacuation announcements through the sound system with
our instruments is straight forward, in accordance with standards, and delivers professional
documentation. At the same time, the complete frequency response is measured.

5

Room and Building Acoustics

The standard XL2 contains all the necessary functions for measuring room and building
acoustics, including reverberation time in octave bands. An intelligent auto-naming process helps with the assignment of each result as a sending/receiving room or ambientlevel measurement.

Measuring Airborne and Impact Noise
The measured results can then be loaded into the optional Sound Insulation Reporteror Room Acoustics Reporter software packages. Sound Insulation Reporter creates
the averaging curves and determines the standard insulation values D,​​ Dn, DnT und R’
in a matter of seconds. At the push of a button, you will then be able to create readymade reports – with your logo.

Reverberation Time Optimization
Room Acoustics Reporter similarly supports theassessment of a room. It offers simulation options forcalculating the target reverberation time by inserting
various insulation materials that can be selected froma comprehensive catalog.

Sound Insulation Reporter Software

6

Noise Measurement / Remote Monitoring

The XL2 Sound Level Meter provides all the functions needed to measureand monitor noise. Its removable SD card offers plenty of space to record
levels, spectra and audio files. The data can also be read out during an
ongoing measurement via its USB interface.
With the weatherproof case and the type-approved WP30 microphone
protection, self-sufficient remote measurement stations can be created.
The NetBox gives communication capabilities to the XL2 via LAN or mobile
data and allows access to the device via a web browser.

With NoiseScout in the Cloud
For professional, cloud-based remote monitoring of construction sites, airports, etc., the NoiseScout cloud portal is available. Monitor any numberof measurement stations and visualize their data. The system generates
email warnings, including audio snippets, when level limits are exceeded.
All measured values and​​audio files are available for download by the user.

Outdoor Case with XL2Rating Level from Data Explorer
For post-processing, the measurement data can be loaded from thecloud or from the measuring device into the Data Explorer PC software
for comprehensive analysis. Periods containing tonal or impulsive noise
are automatically marked and the Rating Level Lr calculated.

Data Explorer Software7Vibration Meter

With the Vibration Option and an attached accelerometer, the XL2 is well
suited for vibration analysis or as an efficient and cost-effective solution forindustrial vibration quality control.
The device measures acceleration for frequencies down to 0.7 Hz and calculates velocity and displacement. The results can be displayed in metric or
imperial units, or as a dB value with adjustable reference level. With various
filters and time weightings, a gliding RMS level for easy reading, and peakreadings, the Vibration Meter is ideal for a wide range of applications.

Spectral Results and Logging

Broadband Vibration Measurement

All vibration results can be displayed as a 1 / n-octave spectrum or linearlyas FFT. The frequency range can be set to suit the application.
Results are logged in plain text format. In addition, if required, the vibration signal can be saved as a compressed WAV file. All measurement data,
together with an optional voice memo, is stored on the SD card; providing
capacity for long-term measurements.

Spectral FFT Representation for Vibration Analysis

8Manufacturing Quality Control

Whether you need to measure structure-borne noise with an accelerometer orsound with a microphone, the XL2 can be easily integrated into your production line.

Pass/Fail Testing
The optional Spectral Limits function is particularly suitable for performing
pass/fail measurements. First, a number of spectral measurements are averaged
from a series of known good samples. Spectral fail limits are then calculated using a tolerance rule. Using these, the XL2 can then autonomously measure thespectrum of all products and visualize the result.
Spectral Limits with Tolerances

For the frequency analysis, a high-resolution zoom FFT or a spectrum with aresolution of up to 1/12 octave is available.

Automation
With its digital inputs and outputs, the XL2 can communicate directly witha controller. The measurement can be started via an external signal and themeasurement result displayed as a PASS/FAIL signal.
Using the Remote Measurement Option, the entire control and the reading of
the measurement results can be realized via the USB interface.

Stack Light

9

Functions
Sound Level Meter

Spectral Analyzer

FFT Analyzer

The XL2 with measurement microphone is a pre-Real-time analysis RTA is an ideal tool for opti-

The real-time FFT is the ideal tool for detecting

cise Sound Level Meter. All measurement results

mizing sound systems. In addition to the broad-comb filters and resonant frequencies. The XL2

are available simultaneously, e.g. Leq, Lmin,band levels, the XL2 simultaneously measures

measures the actual level and the time-averaged

Lmax, and LCpeak, with the frequency weighting

the real-time spectrum in 1/3 or 1/1 octave band

Leq level in three frequency ranges.

A, C, Z and the time weighting Fast, Slow andresolution.

optional Impulse.

10

Polarity, Delay, Oscilloscope

Audio Analyzer

Reverberation Time RT60

Other measurement functions determine theWith a balanced XLR and unbalanced RCA input,

Measure the reverberation time in a room withspeaker polarity, help with the setup of delay

the XL2 is a high-performance audio analyzer.

automatic triggering from an impulse or gatedlines or represent the signal in an auto-ranging

It simultaneously measures balance, RMS level,pink noise sound source.

oscilloscope.

frequency, and harmonic distortion (THD + N).

Options
Speech Intelligibility STIPA

Extended Acoustic Pack

Spectral Limits

The XL2 measures STI and CIS values for speech

The Extended Acoustic Pack Option provides

The Spectral Limits Option extends spectral

intelligibility of evacuation and announcement

advanced acoustic measurement possibilities.

analysis with 1/6 and 1/12 octave resolution,systems in accordance with the IEC 60268-16

The option enables the recording of linear wav

zoom FFT, reference curve recording, relativeand DIN VDE 0833-4 standards. A correction offiles, percentile statistics, sound exposure levels,

display, extensive tolerance management forthe determined speech intelligibility by the ad-spectral logging in 100 ms intervals, RT60 in 1/3

pass/fail testing, and Noise Curves.

dition of the spectrum of the ambient noise isoctave resolution, event monitoring, and much

possible.

more.

Vibration Option

Cinema Meter Option

Remote Measurement Option

The Cinema Meter Option enables calibration andMeasurement data can be captured directly on acontrol of cinema speaker systems in accordance

PC in real time via the USB interface to the XL2,

with the SMPTE ST 202: 2010 and RP 200: 2012

e.g. with MS Excel or LabView.

standards.

Sound Insulation Option

Data Explorer Option

PC software to analyze, visualize, and gener-

PC software for quick, professional analysis ofate standards-compliant reports for airborne,sound level data. Data Explorer supports acous-

impact, and facade sound insulation measure-ticians and experts in evaluating measurement

ments.

data.

Sound Power Option

TA Option (Type Approval)

The Vibration Option turns the XL2 into a flexible

PC software for detailed data analysis and auto-

Upgrades the XL2 to the XL2-TA, which, together

vibration meter, with FFT analysis and data log-

matic generation of comprehensive sound powerwith the M2230 measurement microphone, forms

ging, for frequencies down to 0.7 Hz.

measurement reports in accordance with thea type-approved sound level meter in accordance

ISO 3741, 3744, 3746, and ANSI-ASA standards.

with the IEC 61672 and IEC 61260 standards.

11

M2230 / M2211 / M2215

Measurement Microphones

M4261

All microphones are 48 V phantom powered and include a chip with anelectronic data sheet. After connecting the microphone, the XL2 reads
this data sheet and recognizes the microphone model and the calibration
data. This promotes faster setup and ensures accurate measurements.

MODEL

DESCRIPTION

M2230

Class 1 measurement microphone with metal diaphragm for measurements in accordance with the IEC 61672
standard (type-approved with XL2-TA)
Class 1 Outdoor measurement microphone, consists of M2230 Microphone and WP30 Weather Protection (type-approved)
General purpose measurement microphone with metal diaphragm and Class 1 frequency response
Measurement microphone with metal diaphragm for high acoustic levels (up to 153 dB) and Class 1 frequency response
Cost-effective Class 2 measurement microphone for general sound level testing, commissioning and serviceof audio-acoustic installations

M2230-WP30
M2211
M2215
M4261

M223 0 / CL ASS 1
Certified
Microphone Type

M2211 / CL ASS 1
Frequence Response

Omni-directional, pre-polarized condenser, free field microphone

Capsule / Transducer
PreAmplifier
Flatness Acc. IEC61672-1

1/2” detachable with 60UNS2 thread
MA220 (included)
Class 1Frequency Range
Residual Noise Floor typical

1/4” fixed–
Class 25 Hz – 20 kHz
16 dB (A)21 dB (A)25 dB (A)27 dB (A)24 dB (A) - 137 dB

29 dB (A) - 144 dB

33 dB (A) -153 dB

33 dB (A) - 146 dB

137 dBSPL

144 dBSPL

153 dBSPL

142 dBSPL

Sensitivity typ. @ 1 kHz-27.5 dBV/ Pa(42 mV/ Pa)–34 dBV/ Pa(20 mV/ Pa)–42
dBV/ Pa( 8 mV/ Pa)-36 ± 4 dBV/ Pa(16 mV/ Pa)

Temperature Coefficient <-0.01 dB/ °C

Linear Range with XL2Maximum SPL THD 3 %, 1 kHz

Temperature Range
Pressure Coefficient±2Electronic Data Sheet±3±3± 0.015 dB/ °C–10 °C to +50 °C / 14 °F to 122 °F-0.005 dB/kPa

Influence of Humidity
Humidity Range
Long Term Stability± 0.02 dB / °C
0 °C to 40 °C / 32 °F to 104 °F-0.02 dB/kPa< ± 0.05 dB (non-condensing)
5% to 90% RH, non-condensing> 250 years / dB

-0.04 dB/kPa< ± 0.4 dB
not defined

NTi Audio ASD in accordance with IEEE P1451.4 V1.0 / Class 2, Template 27

Power Supply
Connector

48 VDC phantom power, 3 mA typical
Balanced, 3-pole XLR

Dimensions

Length 150 mm ( 5.9” ), diameter 20.5 mm ( 0.8” )Weight

100 g, 3.53 oz

NTi Audio #12

M4261 / CL ASS 2

M2215 / CL ASS 1
Frequence Response(High SPL)

600 040 050

600 040 022

83 g, 2.93 oz
600 040 045

600 040 070

Ordering Information
PRODUCTNTi Audio #XL2 + M2230

600 000 355

XL2 + M2211

600 000 351

XL2 + M4261

600 000 341

XL2 Analyzer (no microphone)

600 000 330

XL2 Options

NTi Audio #Speech Intelligibility STIPA

600 000 338

Extended Acoustic Pack

600 000 339

Remote Measurement

600 000 375

Spectral Limits

600 000 376

Type Approval

600 000 377

Cinema Meter

600 000 379

Data Explorer

600 000 430

Sound Insulation Reporter

600 000 432

Room Acoustic Reporter

600 000 440

Vibration Option

600 000 436

AC CE S S ORI E S
Calibration
Certificate

Precision Calibrator# 600 000 388

Calibration Certificate# 600 000 018

ASD Cable 5, 10, 20 M
# 600 000 336/64/65

Limit Light# 600 000 600

89.4 dBA
85.3 dBLeq

Stack Light# 600 000 610

NetBox with Modem# 600 000 458

XL2 Projector Pro(free software)

XL2 Input Keypad# 600 000 384

Mains Power Adapter

Battery Charger# 600 000 332

XL2 System Case
# 600 000 334

Ever-ready Pouch# 600 000 335

International # 600 000 333

13Complete Solutions
Tailored Sets in a Case
For each application, we offer a specially tailored
set of measurement instruments in a rugged case.
It contains:

XL2 AUDIO AND ACOUSTIC ANALYZERREQUIRED OPTIONS AND ACCESSORIESMEASUREMENT MICROPHONE

Related Products

14

Signal Generators

Flexus FX100

TalkBoxAnalog Audio: Minirator MR-PRO
Digital Audio: Digirator DR2

Analog and Digital Audio Analyzer
for Quality Control and Service

Calibrated Acoustic Generator
(STIPA Reference & other signals)

XL2 Technical Specifications
SOUND LEVEL METER
Product
Configuration inaccordance withIEC 61672 /ANSI S1.4· XL2 with M2230 microphone
Class 1 certified with Shroud· XL2 with M2211 or M2215 microphone
Class 1 Frequency response· XL2 with M4261 microphone Class 2

ComplyingStandards

IEC 61672, IEC 60651, IEC 61260, IEC
60804, ANSI S1.4, ANSI S1.43, DIN 45657

Functions· SPL actual, Lmin, Lmax, L peak, Leq, gliding Leq· Optional: Percentile statistics, sound exposurelevel, takt maximal level· All measurement results simultaneously available· Correction value measurement wizard· Logging all data or subsets in selectableintervals· Recording of wav files and voice notes· Limit monitoring showing exceeding sound levels· Digital I/O interface for external peripherals control

Weighting· Frequency weighting: A, C, Z (simultaneous)· Time weighting: Fast, Slow, Peak, optional: Impulse

Details· Measurement bandwidth (-3dB): 4.4 Hz to 23.0 kHz· Level resolution: 0.1 dB· Internal noise: 1.3 µV A-weighted

Real-Time
Analyzer
RTA

I N P U T / O U T P U T I N T E R FA C E S
Audio Inputs· XLR balanced with input impedance 200 kOhm,
phantom power: +48 V switchable· RCA unbalanced,
Input impedance > 30 kOhm
· Built-in condenser microphone for polarity
testing, delay measurements and voice noterecording

Audio Outputs· Built-in speaker· 3.5 mm minijack, stereo headphone connector

USB
Interface· Mini USB connector for data transfer to PC,
remote measurement, XL2 Projector andbattery charging

Digital I /O

Connection interfaces to accessories· XL2 Input Keypad· Limit Light, Stack Light· Digital PCB I /O Adapter

Memory· SD Card included ( 8 GByte), removable,
storing measurement data in ASCII format,
screenshots, voice notes and wav files.
Expansion to max. 32 GB with # 600 000 386

Power
Supply· Rechargable Li-Po battery included(3.7 V / 2260 mAh)
· Dry cell batteries type AA, 4 x 1.5 V, (Alkaline)· Linear external power supply 9 VDC / 1 A(charges battery during operation)· USB power supply· Wide band
· 1/1 octave band: 8 Hz - 16 kHz· 1/3 octave band: 6.3 Hz - 20 kHz· Capturing for comparative measurements

A C O U S T I C A N A LY Z E R
FFT Analysis· Real-time FFT with actual level, L eq , L min , L max· Level resolution: 0.1 dB· Optional: Pass / Fail testingReverberation
Time RT60· 1/1 octave band results from63 Hz – 8 kHz ( T20, T30 )· Optional: 1/3 octave band results from50 Hz – 10 kHz

A U D I O A N A LY Z E R
Level RMS

· True RMS detection in V, dBu, dBV, and dBSPL· Range XLR / RCA input: 2 µV to 25 V
( –112 dBu to +30 dBu)
· Accuracy: ± 0.5 % @ 1 kHz· Flatness: ±0.1 dB @ 12 Hz to 21.3 kHz· Bandwidth ( –3 dB ): 5 Hz to 23.6 kHz

Frequency

Propogation delay between electrical reference
signal and acoustic signal using the internal
microphone· Range: 9 Hz to 21.3 kHz· Accuracy: < ± 0.003 %THD+N· Range: –100 dB to 0 dB (0.001 % to 100 %)· Residual THD+N @ XLR / RCA input: < 2 µV

Polarity· Checks polarity of speakers and line signals

Scope· Auto ranging, auto scaling

1/12 Octave
Analysis(optional)· Aktual level, L eq , L min , L max· Selectable 1/1, 1/3, 1/6, 1/12 octave resolution· Pass / Fail testing

Filter· Frequency weighting: A, C, Z
· Highpass 100 Hz, 400 Hz, 19 kHz· Bandpass 22.4 Hz – 22.4 kHz

SpeechIntelligibility
STIPA(optional)· Single value STI and CIS ( IEC 60268-16:
1998, 2003, 2011) internal ambient noisecorrection and automatic averaging of measurements in accordance withDIN VDE 0833-4· Modulation indices and individual band results

Delay Time

GENERAL
Clock

Real-time clock with lithium backup battery

Temperature–10 °C to +50 °C (14 °F to 122 °F )Humidity

5 % to 90 % RH, non-condensing

15

XL2
info@nti-audio.com

www.nti-audio.com

All information is subject to change without notice.
Data Explorer, Sound Insulation Reporter, Room Acoustics Reporter,
Projector PRO, TalkBox and Flexus FX100 are trademarks of NTi Audio AG.

06.22

XL2, M2230, M2211, M2215, M4261, Minirator MR-PRO, MR2, NoiseScout,