Version: V 2.0 2023-07-03

1

Table ofContents
1 Overview
1.1 Measurement Microphones
1.2 Outdoor Measurement Microphones
1.3 Microphone Preamplifiers
1.4 Scope of Delivery

6
8
9
10

2 Description
2.1 Integrated PreAmplifier
2.2 Electronic Data Sheet
2.3 Connecting to XL2 or XL3
2.3.1 Microphone plugs directly into the XL2 or XL3
2.3.2 Microphone Connection via the ASD Cable
2.3.3 Microphone Connection via a professional Audio Cable

14
14
15
15
15
16

3 Outdoor Microphones
3.1 Assembling
3.1.1 Install ASD Cable
3.1.2 Insert Measurement Microphone
3.1.3 Attach the Microphone to the Upper Body Tube
3.1.4 Assemble the Weather Protection Body
3.1.5 Mount the Top Section

20
20
21
22
23
24

2

3.2 Calibration
3.3 Disassembling the Top Section
3.4 Handle Wind Screen with Care

25
28
29

4 Accessories
4.1 WP30-90/-150 Weather Protection
4.2 WP61 Weather Protection for M4261
4.3 Pole Mount Adapter
4.4 WP30-90 / WP61 Windscreen Replacement
4.5 WP30-150 Windscreen Replacement
4.6 ½" Windscreen 90 mm
4.7 Class 1 Sound Calibrator
4.8 Class 2 Sound Calibrator
4.9 Manufacturer Calibration Certificate
4.10 Lightweight Tripod
4.11 ASD Cable

31
32
33
33
34
34
35
35
36
37
38

5 Further Information
5.1 My NTi Audio
5.2 Calibration Certificate
5.3 Service and Repairs
5.4 Capsule Replacement Instructions

3

39
40
41
41

5.5 Warranty Conditions
5.5.1 International warranty
5.5.2 Limitations
5.5.3 Statutory Rights
5.6 CE Declaration of Conformity
5.7 Information for Disposal and Recycling
5.7.1 Regulations for the EU and other European countries with corresponding laws
5.7.2 Other countries outside the EU

44
44
44
44
45
46
46
46

6 Technical Data Measurement Microphones
6.1 Certified Class 1 Measuring Microphones
6.2 Measuring Microphones

47
50

7 Technical Data Microphone Preamplifiers
7.1 Outdoor Measurement Microphones
7.2 Typical Frequency Response of Measurement Microphones
7.3 Free Field - Pressure Correction Factors
7.4 Free-field and Diffuse-field Sensitivity of M2230 and M2340
7.5 Spectral Correction for horizontal Sound Incidents using the Outdoor Microphone
7.6 Technical Data PreAmplifier

58
61
62
65
66
68

8 Safety instructions4

5

1 Overview

1 Overview
1.1 Measurement Microphones
M2211

M2215

M2230

M2340

General purpose measurement microphoneclass 1 frequency
response, metal diaphragm

Measurement microphone for high soundlevels (up to 153 dB),class 1 frequency
response, metal diaphragm

Certified Class 1 measurement microphone inaccordance with IEC
61672, metal diaphragmClass 1 measurement
microphone in accordance with IEC 61672,
metal diaphragm, system self-test (CIC) with
XL2 or XL3

consists of MA220
PreAmplifier and 7052
capsuleconsists of MA220
PreAmplifier and 7056
capsuleconsists of MA220
PreAmplifier andMC230 or MC230A
capsuleconsists of MA230
PreAmplifier andMC230A capsule6

1 Overview

7

M2914

M4261

High-performance microphone
for acoustic measurements ofvery low sound pressure levels

Cost-effective class 2 measurement microphone for generalsound level testing and service ofaudio-acoustic installations

requires ICP Adapter ASD

with permanently-installed
capsule1 Overview

1.2 Outdoor Measurement Microphones
M2230-WP-90/-150

M2340-WP-90/-150

M4261-WP

Certified outdoor measurement
microphone, class 1 in accordance with IEC 61672

Certified outdoor measurement
microphone, class 1 in accordance with IEC 61672, systemself-test (CIC) with XL2 or XL3

Outdoor measurement microphone, class 2 in accordancewith IEC 61672

consists of M2230 Measurement
Microphone + WP30 Weather
Protection with 90 mm or 150
mm windscreen

consists of M2340 Measurement
Microphone + WP30 Weather
Protection with 90 mm or 150
mm windscreen

consists of M4261 Measurement
Microphone + WP61 Weather
Protection with 90 mm windscreen

8

1 Overview

1.3 Microphone Preamplifiers
MA220

MA230

Microphone preamplifier comMicrophone preamplifier compatible with 1/2” pre-polarized cappatible with 1/2” pre-polarized capsules, system self-test (CIC) withsules
XL2 or XL3

9

1 Overview

1.4 Scope of Delivery
M2211

Measurement Microphone consisting ofMicrophone PreAmplifier MA220
Microphone Capsule 7052
Dust cap
33 mm Windscreen
Microphone-holder with Adapter 5/8" – 3/8"
Operating Manual

M2215

Measurement Microphone consisting ofMicrophone PreAmplifier MA220
Microphone Capsule 7056
Dust cap
33 mm Windscreen
Microphone-holder with Adapter 5/8" – 3/8"
Operating Manual

10

1 Overview
M2230

Measurement Microphone consisting ofMicrophone PreAmplifier MA220
Microphone Capsule MC230 or MC230A
Dust cap
50 mm Windscreen
Microphone-holder MH01with Adapter 5/8" – 3/8"
Operating Manual
Individual Frequency Response Chart

M2340

Measurement Microphone consisting ofMicrophone PreAmplifier MA230
Microphone Capsule MC230A
Dust cap
90 mm Windscreen
Microphone-holder with Adapter 5/8" – 3/8"
Operating Manual
Individual Frequency Response Chart

11

1 Overview

M4261

Measurement Microphone
33 mm Windscreen
Microphone-holder with Adapter 5/8" – 3/8"
Operating Manual

WP30-90Bird spike BS01
90 mm Windscreen
Protection cage
Upper body tube with Allen key mount
Lower body tube
Footer plate with tripod mounting thread (incl. 3 Allen screws)
Allen key

12

1 Overview
WP30-150

Bird spike BS02
150 mm Windscreen
Protection cage
Upper body tube with Allen key mount
Lower body tube
Footer plate with tripod mounting thread (incl. 3 Allen screws)
Allen key

WP61

Bird spike BS01
90 mm Windscreen
Protection cage
Upper body tube with Allen key mount
Lower body tube
Footer plate with tripod mounting thread (incl. 3 Allen screws)
Allen key13

2 Description

2 Description
The plug-on measurement microphones combined with the XL2 or XL3 Analyzer form a comprehensive
sound level meter and acoustic analyzer.

2.1 Integrated PreAmplifier
The microphone bodies contain a PreAmplifier and require 48 VDC Phantom power supply for operation.
They combine high dynamic range and wide frequency range with low noise. The measurement microphones can also be connected with an ASD Cable to the XL2 or XL3 Analyzer for measurements at
remote locations or for reduction of acoustic reflections.

2.2 Electronic Data Sheet
The microphones include an electronic data sheet. The AutomatedSensor Detection (ASD) of the
XL2 or XL3 Analyzer automaticallyreads this data, i.e. the microphonemodel and calibration data. This
promotes faster setup and ensuresaccurate measurements.

14

2 Description

2.3 Connecting to XL2 or XL3
2.3.1 Microphone plugs directly into the XL2 or XL3
The XL2 and XL3 automatically read the electronic data sheet of the connected microphone as follows:
Connect the measurement microphone to the XL2/XL3.
Switch on the XL2/XL3.
The XL2 and XL3 read the electronic data sheet of the connected microphone during a brief
initialization process prior to the first measurement.

2.3.2 Microphone Connection via the ASD Cable
The NTi Audio measurement microphones can be connected with an ASD Cable to the XL2 or XL3 Analyzer for measurements at remote locations or for reducing acoustic reflections. The electronic data sheet
is transmitted via the XLR connector’s housing. Do not touch this during the brief initialization period toensure the complete data sheet is recognized by the XL2 or XL3. The automated sensor detection does
not disturb any measurements. You may join 5- or 10-meter ASD Cables together in series. The ASD technology supports accurate data communication up to a combined cable length of 20 meters (= 65 feet),which is also the maximum cable length for CIC operation.

15

2 Description
2.3.3 Microphone Connection via a professional Audio Cable
For distances longer than 20 meter (= 65 feet) use a high quality, low capacitance standard professional
audio cable (NOTE: CIC operation not possible with this configuration!).
The microphone sensitivity has to be entered manually into the XL2 or XL3 Analyzer – Or, alternatively, connect the microphone first directly to the XL2 or XL3, whereby the analyzer reads the sensitivity and remembers this value. Afterwards, connect the audio cable between the analyzer and the microphone.

16

3 Outdoor Microphones

3 Outdoor Microphones
The Outdoor Measurement Microphones offer a weather-protected measurement solution for the XL2 or
XL3 Sound Level Meter allowing acquisition of environmental noise data in outdoor applications. The corrosion-free polymer housing, wind screen, water-repellent membrane and bird spike provide excellent protection from rain, wind, dust and perching birds.
Outdoor Measurement Microphone Types
M2230-WP-90/-150: M2230 Measurement Microphone + WP30 Weather Protection
M2340-WP-90/-150: M2340 + WP30 Weather Protection
M4261-WP: M4261 + WP61 Weather Protection
Do not install the Outdoor Measurement Microphones in horizontal direction. Raindrops may damage the measurement microphone.
The snap mechanism works only at temperatures above –15°C / 5°F (as the O-Ring
stiffens). In colder conditions we suggest you warm up the housing first, e.g. with yourhands.

17

3 Outdoor Microphones18

3 Outdoor Microphones
The Outdoor Measurement Microphones M2230-WP and M2340-WP fulfill the Class 1 requirements
according to IEC 61672 and ANSI S1.4 for vertical sound incidence. For compliance with horizontal soundincidence a spectral correction is employed in the associated XL2 or XL3 Sound Level Meter.
Alternatively the Measurement Microphone M2211 or M2215 can be fitted into the Weather Protection
WP30. These microphones have to be pushed further into the upper body. The top part of the capsule has
to be 17 mm above the upper body housing of the WP30. This is required because the M2211 and M2215
capsule is 3 mm shorter than the default M2230 microphone capsule.
The Outdoor Measurement Microphone M4261-WP fulfills the Class 2 requirements according toIEC 61672 and ANSI S1.4. It consists of an M4261 Microphone and the WP61 Weather Protection. For
compliance with horizontal sound incidence a spectral correction is employed in the associated XL2 or XL3
Sound Level Meter.
Always activate the applicable frequency correction filter in the XL2 or XL3. The filter
ensures that the measurements accuracy meets the class 1 requirements of IEC 61672 andANSI S1.4.

19

3 Outdoor Microphones

3.1 Assembling
This chapter describes how to install the Measurement Microphone into the Weather Protection kit.
3.1.1 Install ASD Cable
Feed the female XLR of the ASD Cable
through the bottom of the lower bodytube.
Attach the footer plate to the lower bodytube using the three Allen screws, feeding the cable through the side slot of thefooter plate.

20

3 Outdoor Microphones
3.1.2 Insert Measurement Microphone
Connect the measurement microphone
to the female XLR of the ASD Cable.
Insert the measurement microphone
into the upper body tube so that the bottom end of the microphone is in line withthe bottom end of the upper body tube.
Align the fixing screw hole of the upper
body tube with the lower screw of themeasurement microphone (remove thefixing screw to see the lower screw
head through the fixing screw hole).

21

3 Outdoor Microphones
3.1.3 Attach the Microphone to the Upper
Body Tube
Attaching the fixing screw of the upper body tube
onto the lower screw of the measurement microphone ensures that the microphone housing is
not scratched.
Insert and gently tighten the fixing screw
while jiggling the microphone. You will feelthe fixing screw center in the head of thelower screw of the microphone. Do not
over tighten the fixing screw.
Again verify that the bottom end of theinserted M2230/M2340 microphone is inline with the bottom end of the upper body
tube.

22

3 Outdoor Microphones
3.1.4 Assemble the Weather Protection
Body
Retract the ASD cable through the lower bodytube and screw the lower body tube to the upper
tube, ensuring that the cable does not twist during this operation.

23

3 Outdoor Microphones
3.1.5 Mount the Top Section
The top section of the weather protection kit consists of the wind screen, the enclosed protection
cage with water-repellent membrane and the bird
spike. Gently slide the top section over the microphone tip and on to the upper body tube. You will
feel a slight increase in resistance approximately
3 mm before the top section’s final position.
Slightly increase the pressure until the top section
snaps into the final position with an audible click.

24

3 Outdoor Microphones

3.2 Calibration
The design of the Outdoor Measurement Microphone supports easy calibration of the microphone. To calibrate, follow the procedure below:
The top section of the Outdoor Microphone is snapped on to the body tube.
Remove the top section of the Outdoor
Microphone by gently pulling the bird
spike upwards. At the same time gently
push up on the cage inside the windscreen with two fingers of your otherhand. You will feel when the snap mechanism is released. Gently remove the top
section.

25

3 Outdoor Microphones
Calibrate the microphone as described in
the XL2 or XL3 user manual using the NTi
Audio Precision Calibrator.
Snap the top section back into position on
the body tube.

26

3 Outdoor Microphones
The outdoor windscreen is recommended to be replaced annually.
The "WP30-90 / WP61 Windscreen Replacement" includes two 90 mm spare windscreens, NTi Audio # 600 040 061.
The "WP30-150 Windscreen Replacement" includes two 150 mm spare windscreens,
NTi Audio # 600 040 095.
The water-repellent membrane in the top section is mounted with two O-rings. Inspect
the O-rings (13 x 1 mm) and the membrane annually for proper seating and good condition. Do not touch the water-repellent membrane.

27

3 Outdoor Microphones

3.3 Disassembling the Top Section
The top section is snapped onto the bodytube. Remove the top section by gently
pulling the bird spike upwards. At thesame time gently push up on the cage
inside the wind screen with two fingers ofyour other hand. You will feel when thesnap mechanism is released.
Gently remove the top section and turnthe top section upside down and hold it by
the bird spike.
Gently unscrew the cage from the hole of
the wind screen. Do not touch the waterrepellent membrane!
Assemble in reverse order.

28

3 Outdoor Microphones

3.4 Handle Wind Screen with
Care
The wind screen is fixed between
the bird spike and the microphonecage.
Do not apply any force onto
the wind screen in order toprevent damage!
Do not touch the waterrepellent membrane!

29

4 Accessories

4 Accessories

30

4 Accessories

4.1 WP30-90/-150 Weather Protection
Protect your measurement microphones M2230 and M2340 fromenvironmental impacts with this professional outdoor weather protection kit. Ideal for precise acquisition of environmental noise datain outdoor applications.
Class 1 compliant with IEC 61672 and ANSI S1.4 for verticaland horizontal sound incidence
Protection from rain and dust (IP54), wind and perching birds
Built from corrosion-free materials
Removable top section for easy microphone calibration
Standard 3/8” tripod mount
Weight: 270 g (9.5 oz.)
Optional Pole Mount Adapter
Optional sturdy outdoor carrying case available
WP30-90: NTi Audio # 600 040 060
WP30-150: NTi Audio # 600 040 090

31

4 Accessories

4.2 WP61 Weather Protection for M4261
Protect your M4261 microphone from environmental impacts withthis professional outdoor weather protection kit.
Class 2 compliant with IEC 61672 and ANSI S1.4 for verticaland horizontal sound incidence
Protection from rain and dust (IP54), wind and perching birds
Built from corrosion-free materials
Removable top section for easy microphone calibration
Standard 3/8” tripod mount
Weight: 270 g (9.5 oz.)
Optional Pole Mount Adapter
Optional sturdy outdoor carrying case available
NTi Audio # 600 040 080

32

4 Accessories

4.3 Pole Mount Adapter
The outdoor measurement microphone may be installed on a poleusing this adapter. The microphone is connected to the sound level
meter by the ASD cable, which runs through the pole and theadapter to the microphone. The adapter is available in two different
sizes.
NTi Audio # 600 040 067, Pole Mount Adapter PM 1”, supports pole diameter 25 – 33 mm (1 – 1.3”)
NTi Audio # 600 040 068, Pole Mount Adapter PM 1 ¼”, supports pole diameter 32 – 44 mm (1.25 – 1.75”)

4.4 WP30-90 / WP61 Windscreen Replacement
The replacement package contains two 90 mm spare windscreensfor outdoor measurement microphones. The outdoor windscreen isrecommended to be replaced annually.
NTi Audio # 600 040 061

33

4 Accessories

4.5 WP30-150 Windscreen Replacement
The replacement package contains two 150 mm spare windscreensfor outdoor measurement microphones. The outdoor windscreen isrecommended to be replaced annually.
NTi Audio # 600 040 095

4.6 ½" Windscreen 90 mm
for M2230, M2340, M2211 and M2215 measurement microphone
NTi Audio # 600 040 109

34

4 Accessories

4.7 Class 1 Sound Calibrator
The battery-operated Class 1 Sound Calibrator is classified forthe calibration of class 1 measurement microphones, soundlevel meters and other acoustic measurement equipment. This
precision microphone calibrator delivers 94 or 114 dB at a frequency of 1 kHz.
NTi Audio # 600 000 388

The optional ¼” adapter ADP-1/4-P is required to fit ¼” measurement microphones.
NTi Audio # 600 000 391

4.8 Class 2 Sound Calibrator
The battery-operated Class 2 Sound Calibrator is classified forthe calibration of class 2 measurement microphones, soundlevel meters and other acoustic measurement equipment. This
microphone calibrator delivers 114 dB at a frequency of 1 kHz.
NTi Audio # 600 000 394

35

4 Accessories

4.9 Manufacturer Calibration Certificate
The calibration certificate lists the individual product data with
serial number. The calibration and adjustment procedures follow the documentation and traceability requirements of the EN
ISO / IEC 17025 standard. Annual re-calibration of the instrument is recommended ensuring accurate measurements.
NTi Audio # 600 000 018

36

4 Accessories

4.10 Lightweight Tripod
Retractable, lightweight tripod with 1/4” ball head and 3/8”
mounting thread. The flexible ball head mounts the XL2 or XL3
Analyzer at any angle. The tripod is suitable for all measurement microphones, outdoor measurement microphones
and the TalkBox.
NTi Audio # 600 000 397

37

4 Accessories

4.11 ASD Cable
The ASD Cable allows for extended connections of the NTi Audio measurement
microphones. It supports the transfer of theelectronic data sheet from the microphone to
the XL2 or XL3 Analyzer, as well as the CIC
feature.
5 m (16 ft): NTi Audio # 600 000 336
10 m (32 ft): NTi Audio #600 000 364
20 m (64 ft): NTi Audio # 600 000 365
The ASD technology for the electronic data
sheet transfer is applicable for cable length
until 20 m (64 ft).

38

5 Further Information

5 Further Information
5.1 My NTi Audio
Register your instruments at My NTi Audio andbenefit from the following possibilities:
Free updates for your instruments
Activation of optional product functions
Premium access to downloads
Receive application and product news
Faster worldwide support

How to Register
Open the web page “https://my.nti-audio.com”.
You are prompted to login or create yourMy NTi Audio account.
The web page “My NTi Audio Products”
opens.

Tracing support in case of loss or theft

Select the product type and enter the serial
number.

Calibration support

Confirm with “Register”.
Now your product is listed in the table “My
Products“.

395 Further Information
Use the microphone for the intended purpose only.
Protect the microphone from contamination by always using the supplied windscreen.
Never use the microphone in a damp or wet environment.
Do not jar or drop the microphone.
Do not remove the microphone protective grid.
Do not touch the microphone membrane.
Remove the black dust cap of the 1/2” measurement microphones prior to use.
In an outdoor environment, ensure that you install protection against lightning strikes.

5.2 Calibration Certificate
The NTi Audio measurement microphones have been carefully tested during production and corresponds
to the specifications listed in “Technical Data”. Calibration certificates for new products are optional.
NTi Audio recommends annual calibration of the products after the purchase. The calibration provides documented and traceable measurement accuracy and confirms that your NTi Audio product meets orexceeds the published specifications. The calibration and adjustment procedures follow the documentationand traceability requirements of the standard EN ISO / IEC 17025.
For calibrations follow the service guidelines at https://www.nti-audio.com/en/support/calibration-service.
40

5 Further Information

5.3 Service and Repairs
If your product is not functioning correctly or is damaged, please contact the local NTi Audio partner forassistance. If the product needs to be returned for service, kindly follow the service guidelines athttps://www.nti-audio.com/en/support/calibration-service.

5.4 Capsule Replacement Instructions
The microphones for the XL2 and XL3 Analyzer include an electronic data sheet. The Automated Sensor
Detection (ASD) of the XL2 and XL3 Analyzer automatically reads this data, i.e. the microphone model andcalibration data. This promotes faster setup and ensures accurate measurements. In case of a capsulereplacement, the electronic data sheet needs to be updated with the data of the new capsule.

41

5 Further Information
Step-by-step instruction
Install the new capsule on the microphone preamplifier.
Plug the measurement microphone directly into the XL2.
Install the latest firmware in the XL2,
available athttps://my.nti-audio.com/support/xl2.
Start the XL2 Projector PRO Software.
The computer requires online connection to the web.
Connect the XL2 with the USB cable to
the Projector PRO software, thus you
see the XL2 display live on the computer
monitor (if prompted select COM-Porton the XL2).
Press the computer keyboard keys “Ctrl+ Shift + F5” at the same time (alternatively “Ctrl + Alt + F5”)42

5 Further Information
Select Original NTi Audio Microphone or Custom microphone.
Case A): Original NTi Audio Microphone
Enter the serial number of the new capsule
Confirm by clicking Write to MA220.
Now XL2 reads the factory sensitivity of the new capsule from the NTi Audio server and stores the
new data into the electronic data sheet of the preamplifier. You will be prompted if all is in goodorder.
Case B): Custom microphone
Enter the microphone sensitivity
Confirm by clicking Write to MA220.
Now XL2 stores the microphone sensitivity as factory sensitivity in the electronic data sheet of theMA220 PreAmplifier.
Verify the setting in the “CALIBRATE” screen of the XL2 and perform a user calibration to verify if
the new capsule works in good order.

43

5 Further Information

5.5 Warranty Conditions
5.5.1 International warranty
NTi Audio guarantees the function of its products and the individual components for a period of one year
from the date of sale. During this period, defective products will either be repaired free of charge orreplaced.
5.5.2 Limitations
These guarantee provisions do not cover damage caused by accidents, transportation, incorrect use, carelessness, non-original accessories, the loss of parts, operation with non-specified input voltages, adapter
types or incorrectly inserted batteries. NTi Audio accepts no responsibility for subsequent damage of any
kind. The warranty will be voided by carrying out repairs or services by third parties who are not part of an
approved
NTi Audio Service Centre.
5.5.3 Statutory Rights
Consumers may have legal (statutory) rights under applicable national laws relating to the sale of consumer products. This warranty does not affect your statutory rights. You may assert any legal rights you
have at your sole discretion.

44

5 Further Information

5.6 CE Declaration of Conformity
We, the manufacturer NTi Audio AG, Im alten Riet 102, 9494 Schaan, Liechtenstein, do hereby declarethat the measurement microphones M2230, M2340, M2211, M2215, M2914, M4261, the preamplifiers
MA220, MA230 and accessories, comply with the following standards or other standard documents:
EMC: 2014/30/EU
Harmonized standards: EN 61326-1
Explosive atmospheres (ATEX): 2014/34/EU
Directive 2011/65/EC on the restriction of the use of certain hazardous substances in electrical andelectronic equipment (RoHS).
Directive 2012/34/EU on waste electrical and electronic equipment (WEEE).
This declaration will become invalid if modifications to the instrument are carried out without the written
approval of
NTi Audio.
Date: 07. July 2023

Position: CEO45

5 Further Information

5.7 Information for Disposal and Recycling
Dispose of the instrument in accordance with the legal environmental regulations in the
country.

5.7.1 Regulations for the EU and other European countries with corresponding laws
The instrument must not be disposed of in the household garbage. At the end of its service life, bring the
instrument to a collecting point for electrical recycling in accordance with the local legal regulations.
5.7.2 Other countries outside the EU
Contact the respective authorities for the valid environmental regulations in the country.

46

6 Technical Data Measurement Microphones

6 Technical Data Measurement Microphones
6.1 Certified Class 1 Measuring Microphones
M2340 Class 1 certified with selfexamination

M2230 class 1 certified

Scope of delivery

MA230 preamplifier + MC230A micro- MA220 preamplifier + MC230A microphone capsulephone capsule

Microphone type

Omnidirectional, condenser free-field microphone with continuous polarization

Classification according to IEC 61672 andANSI S1.4

Class 1 certified

Microphone capsule½" removable with thread 60UNS2 type WS2F according to IEC 61094-4

Preamplifier typeSelf-check

47

MA230

MA220

Yes

No

6 Technical Data Measurement Microphones
M2340 Class 1 certified with selfexamination

M2230 class 1 certified

Frequency response
tolerance typical±1 dB @ 5 Hz – 20 Hz±1 dB @ >20 Hz – 4 kHz±1.5 dB @ >4 kHz – 10 kHz±2 dB @ >10 kHz – 16 kHz±3 dB @ >16 kHz – 20 kHz

Individual frequency
response

Freely available as Excel file: register the microphone on my.nti-audio.com andcontact info@nti-audio.com

Frequency range
Intrinsic noise typical
Maximum soundpressure level @ distortion factor 3%, 1kHz
Sensitivity typical @1 kHz
Temperature coefficient

5 Hz – 20 kHz
17 dB(A)16 dB(A)138 dBSPL

137 dBSPL

27.5 dBV/Pa ±2 dB (42 mV/Pa)< –0.01 dB / °C

48

6 Technical Data Measurement Microphones
M2340 Class 1 certified with selfexamination

M2230 class 1 certified

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

Influence of air pressure
Influence of humidity(non-condensing)

0.005 dB / kPa

Humidity< ±0.05 dB
5% to 90% RH, non-condensing

Long-term stability> 250 years / dB

Power supply
Power consumption

48 VDC phantom power
0.76 mA typical

2.3 mA typicalElectronic data sheet

NTi Audio ASD according to IEEE P1451.4 V1.0, Class 2, Template 27

Output impedance

100 Ω symmetrical

Output connector

balanced 3-pin XLR

Diameter

20.5 mm (0.8")

Length154 mm (6.1")

Weight

100 g, 3.53 oz

496 Technical Data Measurement Microphones
M2340 Class 1 certified with selfexamination
Protection class

M2230 class 1 certified

IP51

NTi Audio #600 040 230

600 040 050

6.2 Measuring Microphones
M2211 frequency
response class 1

M2215 for high soundlevels, frequency
response class 1

M4261 class 2

MA220 preamplifier + M2215
microphone capsule

M4261 with fixedmicrophone capsule

IncludesMA220 preamplifier +M2211 microphone
capsuleMicrophone type

Omnidirectional, condenser free-field microphone with continuous polarization

Electret capsule

Frequency response class 1

Class 2

1/2" removable with thread 60UNS2 type WS2F according
to IEC 61094-4

1/4" fixed mounted

Classification according to IEC 61672 andANSI S1.4
Microphone capsule50

6 Technical Data Measurement Microphones
M2211 frequency
response class 1

MA220

Preamplifier typeSelf-check

Frequency response
tolerance typical

Individual frequency
response freely available as Excel file,no51

M4261 class 2-

no±1 dB @ 5 Hz – 20 Hz±1 dB @ >20 Hz – 4 kHz±1.5 dB @ >4 kHz – 10 kHz±2 dB @ >10 kHz – 16 kHz±3 dB @ >16 kHz – 20 kHz

no+1/-4.5 dB @ 5 Hz – 20
Hz
±1.5 dB @ >20 Hz – 4kHz±3 dB @ >4 kHz – 10 kHz±45 dB @ >10 kHz – 16
kHz ±5 dB @ >16 kHz –20 kHzFreely available as Excel file: register the microphone on my.nti-audio.com and contact info@nti-audio.com

Frequency range
Sensitivity typical @ 1
kHz

M2215 for high soundlevels, frequency
response class 1

5 Hz – 20 kHz

34 dBV/Pa ±3 dB (20mV/Pa)

42 dBV/Pa ±3 dB (8 mV/Pa)

36 dBV/Pa ±3 dB (16mV/Pa)

6 Technical Data Measurement Microphones
M2211 frequency
response class 1
Intrinsic noise typical 21 dB(A) @ 20 mV/Pa
Maximum soundpressure level @ distortion factor 3%, 1kHz
Temperature coefficient
Temperature range
Influence of air pressure
Influence of humidity(non-condensing)
Humidity
Long-term stability
Power supply

M2215 for high soundlevels, frequency
response class 1

M4261 class 2

25 dB(A) @ 8 mV/Pa

27 dB(A) @ 16 mV/Pa

153 dBSPL

142 dBSPL

144 dBSPL< ±0.015 dB / °C

< ±0.02 dB / °C

–10°C to +50°C (14°F to 122°F)

0°C to +40°C (32°F to
104°F)

0.02 dB / kPa

0.04 dB / kPa< ±0.05 dB< ±0.4 dB

5% to 90% RH, non-condensing> 250 years / dB-

48 VDC phantom power52

6 Technical Data Measurement Microphones
M2211 frequency
response class 1

2.3 mA typicalPower consumption
Electronic data sheet

M2215 for high soundlevels, frequency
response class 1

1.7 mA typicalNTi Audio ASD according to IEEE P1451.4 V1.0, Class 2, Template 27

Output impedance

100 Ω symmetrical

Output connector

balanced 3-pin XLR

Diameter

20.5 mm (0.8")

Length

150 mm (5.9")
100 g, 3.53 oz

WeightProtection classNTi Audio #M4261 class 2

83 g, 2.93 oz
IP 51

600 040 022

600 040 045

600 040 070

M2914 Low-Noise
Microphone typeCapsule / transducer

53

Omnidirectional, pre-polarized condenser, free field microphone

1/2” detachable with 60UNS2 thread, type WS2F according IEC 61094-4
matched with preamplifier6 Technical Data Measurement Microphones
M2914 Low-Noise
Preamplifier type

MA214

Flatness tolerance
bands typical±2 dB @ 10 Hz – 16 kHz±3 dB @ 5 Hz – 20 kHz

Sensitivity typical @1 kHz

320 mV/Pa

Residual noise floor
typicalMaximum SPL @THD 3%, 1 kHz, S_
typicalTemperature coefficient

6.5 dB(A)Peak 103 dB / RMS 100 dB< ±0.01 dB / °C

Temperature range–20°C to +60°C (–4°F to 140°F)

Pressure coefficient–0.00001 dB/Pa

Humidity
Power supply< 90% R.H., non-condensing
ICP

54

6 Technical Data Measurement Microphones
M2914 Low-Noise
Current consumption

4 – 20 mA typical

Output impedance< 100 ΩConnector

BNC

Diameter

12.7 mm (0.5"), protection grid 13.2 mm (0.52")

Length135 mm (5.3”)

Weight

250 g (8.8 oz)

Windscreen diameter

50 mm (2")

NTi Audio #600 040 240

55

7 Technical Data Microphone Preamplifiers

7 Technical Data Microphone Preamplifiers
MA230

MA220

Microphone preamp- Compatible with 1/2" microphone capsules type WS2F according to IEC61094lifier
4
Frequency range
Frequency response

1.3 Hz – 49.5 kHz

4 Hz – 100 kHz±0.1 dB, 10 Hz - 20 kHz±0.2 dB

Phase linearity< 1° @ 20 Hz - 20 kHz

Intrinsic noise typical

2.4 μV(A) @ Cin 15 pF ≙ 9.1 dBA @ 42mV/Pa

1.6 μV(A) @ Cin 18 pF ≙ 5.6 dBA @42 mV/Pa

Maximum output
voltage

22 Vpp ≙ 7.78 Vrms ≙ 139.3 dBSPL @42 mV/Pa

21 Vpp ≙ 7.4 Vrms ≙ 138.9 dBSPL @42 mV/Pa

Contains calibration data
Electronic data sheet

Original NTi Audio sensitivity = 4.9 V/Pa
Save and read data with M-Series Microphones Analyzer
NTi Audio ASD according to IEEE P1451.4 V1.0, class 2, template 27

Self-check

Yes

No

56

7 Technical Data Microphone Preamplifiers
MA230
Humidity

5% to 90% RH, non-condensing

Power supply
Power consumption

MA220

48 VDC phantom power
0.76 mA typical

2.3 mA typicalElectronic data sheet

NTi Audio ASD according to IEEE P1451.4 V1.0, class 2, template 27

Output impedance

100 Ω symmetrical

Output connector

balanced 3-pin XLR

Diameter

20.5 mm (0.8")

Length154 mm (6.1")

Weight

100 g, 3.53 oz

Protection classNTi Audio #

57

IP51
600 040 200

600 040 050

7 Technical Data Microphone Preamplifiers

7.1 Outdoor Measurement Microphones
M2230-WP-90(M2230+WP30)

M2230-WP-150(M2230+WP30)

M4261-WP(M4261+WP61)

Classification
with XL2 or XL3
according toIEC 61672,
ANSI S1.4

Class 1

Class 1

Class 2

Certifications

LNE, PTB

–

–

–

–

–

36 mm (1.4")

36 mm (1.4")

36 mm (1.4")

378 mm (14.9")378 mm (14.9")378 mm (14.9")

430 g (15.17 oz)

430 g (15.17 oz)

430 g (15.17 oz)

IP54 in vertical position

IP54 in vertical position

IP54 in vertical position

System Selftest (CIC)
DiameterDimensions
Length Dimensions
WeightEnvironmental
Protection

58

7 Technical Data Microphone Preamplifiers

NTi Audio #M2230-WP-90(M2230+WP30)

M2230-WP-150(M2230+WP30)

M4261-WP(M4261+WP61)

600 040 050

600 040 050

600 040 070+ 600 040 060+ 600 040 090+ 600 040 080

M2340-WP-90 (M2340+WP30)

M2340-WP-150 (M2340+WP30)

Classification
with XL2 or XL3
according toIEC 61672,
ANSI S1.4

Class 1

Class 1

Certifications

LNE, PTB

LNE

System Selftest (CIC)
DiameterDimensions
Length Dimensions
Weight59

with XL2 or XL3
36 mm (1.4")
378 mm (14.9")378 mm (14.9")

430 g (15.2 oz)

450 g (15.9 oz)

7 Technical Data Microphone Preamplifiers
M2340-WP-90 (M2340+WP30)
Environmental
Protection
NTi Audio #M2340-WP-150 (M2340+WP30)

IP54 in vertical position
600 040 230 + 600 040 060

600 040 230 + 600 040 090

60

7 Technical Data Microphone Preamplifiers

7.2 Typical Frequency Response of Measurement Microphones

61

7 Technical Data Microphone Preamplifiers

7.3 Free Field - Pressure Correction Factors
If a measurement microphone is located in a free-field environment, then the microphone capsule acts likea reflector at high frequencies, as the sound pressure increases in front of the membrane. M2211, M2215,
M2230, M2340 and M4261 are free-field equalized measurement microphones, they compensate for theincreased pressure internally. The calibration of the measurement microphones M2230 and M2340 with
the B&K 4226 requires the accessory Adapter Ring MXR01, NTi Audio # 600 040 105. Please note, nevertouch the diaphragm of the measurement microphone capsule.
The calibrator no longer offers free-field conditions. Therefore, the free-field equalization of the microphone must be compensated. This needs to be considered prior to the calibration. The correction value​needs to be added to the pressure response of the microphone.
Example:During the calibration, the XL2 or XL3 measures the sound level in the calibrator. If the B&K 4226 calibrator is used and is set to 16 kHz, then the XL2 or XL3 + M2230 reads just 86.7 dBA.
The free-field sound level is calculated by summing the XL2 or XL3 measurement value and the correction value (86.7 dB + 7.3 dB = 94.0 dB).

62

7 Technical Data Microphone Preamplifiers

The following corrections apply with the B&K 4226 calibrator.
Nominal Frequency [Hz]63

M2230, M2340
M2230, M2340
with MXR01[dB]
Adapter [dB]

M2211 [dB]

M2215 [dB]

Measurement
Uncertainty U
[dB]

31.5

–0.3

0.0

–0.2

0.0

0.3

63

0.0

0.0

0.0

0.0

0.3

125

–0.2

0.0

–0.1

–0.1

0.3

250

–0.2

0.0

–0.1

–0.1

0.3

500

–0.2

0.0

–0.1

–0.1

0.3

1000

0.0

0.0

0.0

0.0

0.3

2000

0.1

0.3

0.1

0.0

0.3

4000

0.7

0.7

0.7

0.4

0.3

8000

2.7

2.6

4.5

4.7

0.4

12500

7.2

6.0

5.8

6.1

0.7

16000

7.3

7.3

7.9

7.9

0.8

7 Technical Data Microphone Preamplifiers

Correction values for other calibrators for M2230 and M2340.
Type

Correction value

Calibration Frequency

Calibration Level

NTi Audio CAL200

–0.1

1 kHz

114.0 dB

B&K 4231

–0.2

1 kHz

114.0 dB

Norsonic Nor-1251

–0.2

1 kHz

114.0 dB64

7 Technical Data Microphone Preamplifiers

7.4 Free-field and Diffuse-field Sensitivity of M2230 and M2340

65

7 Technical Data Microphone Preamplifiers

7.5 Spectral Correction for horizontal Sound Incidents using the Outdoor
Microphone
The outdoor microphone M2230-WP fulfills
Class 1 requirements of IEC 61672 and ANSI
S1.4 for vertical sound incidence. For compliance with horizontal sound incidence a spectral correction is employed in the associatedXL2 Sound Level Meter.

.

66

7 Technical Data Microphone PreamplifiersNominal Frequency [Hz]67

WP30 Weather Protection [dB]

WP61 Weather Protection [dB]

1/3rd Octave

1/1 Octave

1/3rd Octave

1/1 Octave

< 800

0.0

0.0

0.0

0.0

800

0.0

1000

0.0

1250

0.1

0.0

1600

0.2

0.2

2000

0.3

2500

0.7

0.8

3150

1.3

1.4

4000

2.0

5000

2.7

2.5

6300

2.9

2.3

8000

3.3

10000

3.9

0.0
0.0

0.4

2.0

3.4

0.0

0.3

2.1

2.4
2.8

0.0

0.4

2.0

2.5

7 Technical Data Microphone PreamplifiersNominal Frequency [Hz]WP30 Weather Protection [dB]

WP61 Weather Protection [dB]

1/3rd Octave

1/3rd Octave

12500

4.6

16000

6.4

20000

6.8

1/1 Octave

1/1 Octave

3.0
5.9

3.0

3.1
3.1

7.6 Technical Data PreAmplifier
MA220 PreAmplifier
Microphone
PreAmplifier
Frequency Range[–3 dB]
Residual Noise
Floor typicalFrequency
Response Flatness

MA230 PreAmplifier with self-test(CIC)

Compatible with 1/2" microphone capsules type WS2F in accordance with
IEC61094-4
4 Hz – 100 kHz

1.3 Hz – 50kHz

1.9 μV(A) @ C_in = 15 pF ≙ 5.6 dBA @ 2.4 μV(A) @ C_in = 15 pF ≙ 9.1 dBA @42 mV/Pa
42 mV/Pa±0.2 dB±0.1 dB, 10 Hz – 20 kHz

68

7 Technical Data Microphone Preamplifiers
MA230 PreAmplifier with self-test(CIC)

MA220 PreAmplifier
Phase Linearity< 1° @ 20 Hz – 20 kHz

Maximum Output
Voltage @ THD
3%, 1 kHz

21 Vpp ≙ 0.4 Vrms ≙ 138.9 dBSPL @42 mV/PaElectronic data
Sheet

Containing user calibration data; default factory sensitivity = 4.9 V/Pa
Read/write by XL2 Audio and Acoustic Analyzer
NTi Audio ASD in accordance with IEEE P1451.4 V1.0, Class 2, Template 27

Impedance
Power Supply
Attenuation
Connector
Thread for Capsule
Weight22 Vpp ≙ 7.8 Vrms ≙ 139.3 dBSPL @42 mV/Pa

Input: 20 GΩ // 0.26 pF, Output: 100 Ω balanced
48 VDC Phantom power, 2.3 mA typical 48 VDC Phantom power, 0.8 mA typical< 0.17 dB (R_Phantom 2 x 6.8 kΩ)< 0.07 dB (R_Phantom 2 x 6.8 kΩ)Balanced 3-pole XLR
60 UNS2
90 g (3.17 oz)

Dimensions

Length 142.5 mm (5.6”), diameter 20.5 mm (0.8”)

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

69

7 Technical Data Microphone Preamplifiers
MA220 PreAmplifier
Humidity
NTi Audio #MA230 PreAmplifier with self-test(CIC)

5 – 90% RH, non-condensing
600 040 040

600 040 200

The product specifications may vary based on the mounted microphone capsule type.

70

8 Safety instructions

8 Safety instructions
In the following, you will find important information on the safe operation of the device. Read and follow these safety
notes and instructions. Keep the instructions for future reference. Ensure that it is available to all persons using thedevice.

DANGER! Threats for children
Make sure that plastic covers, packaging, etc. are disposed of properly and are notwithin the reach of babies and small children. Danger of suffocation! Ensure thatchildren do not detach any small parts from the device (e.g. control knobs or similar). They could swallow the parts and choke on them! Do not allow children to use
electrical equipment unsupervised.
NOTE! Operating conditions
Unless equipped with a Weather Protection kit, the device is designed for indoor
use. To avoid damage, never expose the device to liquids or high humidity. Avoid
prolonged direct sunlight, heavy dirt and strong vibrations.

71