NTI Audio M2230 Operating Manual

All information is subject to change without notice. © All rights reserved. ® Minirator is a registered trademark of NTi Audio. ™ XL2, XL2-TA, EXEL, M2230, M2211, M2215, M4261, MA220 M2230-WP, M4261-WP, WP30 and WP61 are trademarks of NTi Audio. Made in Switzerland Contact NTi Audio at Headquarters +423 239 6060 [email protected] Americas +1 503 684 7050 [email protected] China +86 512 6802 0075 [email protected] Czech +420 2209 99992 [email protected] Germany +49 201 6470 1900 [email protected] Japan +81 3 3634 6110 [email protected] South Korea +82 2 6404 4978 [email protected] United Kingdom +44 1438 870632 [email protected] www.nti-audio.com NTi Audio AG Im alten Riet 102, 9494 Schaan Liechtenstein, Europe is an ISO 9001:2015 certified company.

Overview ............................................................................4 Measurement Microphones .........................................4 Outdoor Measurement Microphones ............................5 Scope of Delivery ..........................................................6 Description ..........................................................................8 Integrated Preamplifier ..................................................8 Electronic Data Sheet ...................................................8 Connecting to XL2 .........................................................9 Outdoor Microphones ......................................................10 Assembling ..................................................................12 Calibration ....................................................................14 Disassembling the Top Section ....................................16 Capsule Replacement Instruction ................................16 Accessories ........................................................................18 Further Information ..........................................................22 My NTi Audio ...............................................................22 Notes ...........................................................................23 Calibration Certificate ...................................................23 Service and Repairs .....................................................23 Warranty Conditions ....................................................24 Declaration of Conformity ............................................24 Technical Data Measurement Microphones ...................26 Technical Data PreAmplifier .............................................35

measurement microphone in accordance with IEC 61672, metal diaphragm General purpose measurement microphone class 1 frequency response, metal diaphragm Measurement microphone for high sound levels (up to 153 dB), class 1 frequency response, metal diaphragm Cost-effective class 2 measurement mi- crophone for general sound level testing, commissioning and service of audio- acoustic installations Microphone preamplifier compatible with 1/2” pre-polarized capsules

M2230-WP Outdoor Microphone M4261-WP Outdoor Microphone Outdoor measurement microphone, class 1 in accordance with IEC 61672 Outdoor measurement microphone, class 2 in accordance with IEC 61672 consists of M2230 Measurement Microphone + WP30 Weather Protection consists of M4261 Measurement Microphone + WP61 Weather Protection

M2230 • Measurement Microphone consisting of - MA220 Microphone PreAmplifier - Microphone Capsule MC230 or MC230A • Dust Cap • 50 mm Windscreen • Microphone-holder MH01 with Adapter 5/8“ - 3/8“ • Operating Manual • Individual Frequency Response Chart M2211 • Measurement Microphone consisting of - Microphone PreAmplifier MA220 - Microphone Capsule 7052 • Dust Cap • 33 mm Windscreen • Microphone-holder with Adapter 5/8“ - 3/8“ • Operating Manual M2215 • M2215 Measurement Microphone consisting of - Microphone PreAmplifier MA220 - Microphone Capsule 7056 • Dust Cap • 33 mm Windscreen • Microphone-holder with Adapter 5/8“ - 3/8“ • Operating Manual M4261 • Measurement Microphone • 33 mm Windscreen • Microphone-holder with Adapter 5/8“ - 3/8“ • Operating Manual MA220 • PreAmplifier • Dust Cap • Microphone-holder with Adapter 5/8“ - 3/8“ • Operating Manual

- Bird spike - 90mm Wind screen - 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 • WP61 Weather Protection for M4261 - Bird spike - 90mm Wind screen - Protection cage - Upper body tube with allen key mount - Lower body tube - Footer plate with tripod mounting thread (incl. 3 allen screws) - Allen key

XL2 Analyzer form a comprehensive sound level meter and acoustic analyzer. The microphones are 48 VDC phantom-pow- ered and include an electronic data sheet. 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 Audio and Acoustic Analyzer for mea- surements at remote locations or for reduction of acoustic re- flections. Electronic Data Sheet The microphones include an electronic data sheet. The Auto- mated Sensor Detection (ASD) of the XL2 Analyzer automati- cally reads this data, i.e. the microphone model and calibration data. This promotes faster setup and ensures accurate mea- surements. Connection diagram of measurement microphones with electronic data sheet Screen connection used for ASD technology XLR M Pin 2 + Pin 3 - Pin 1 Shield Pin 1 Pin 2 Pin 3 XLR M 1 2 3 1 2 3 2 3 1 Microphone ASD Microphone Capsule

Microphone plugs directly into the XL2 The XL2 automatically reads the electronic data sheet of the connected microphone as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2.  The XL2 reads the electronic data sheet of the connected microphone during a brief initialization process prior to the first measurement. Microphone Connection via the ASD Cable The NTi Audio measurement microphones can be connected with an ASD Cable to the XL2 Analyzer for measurements at remote locations or for reducing acoustic reflections. The elec- tronic data sheet is transmitted via the XLR connector’s hous- ing. Do not touch this during the brief initialization period to ensure the complete data sheet is recognized by the XL2. The automated sensor detection does not disturb any measure- ments. You may join 5 or 10 meter ASD Cables together in se- ries. The ASD technology supports accurate data communica- tion up to a combined cable length of 20 meters (= 65 feet). Microphone Connection via a professional Audio Cable For distances longer than 20 meter (= 65 feet) use a high qual- ity, low capacitance standard professional audio cable. The mi- crophone sensitivity has to be entered manually into the XL2 Analyzer. Alternatively connect the microphone first directly to the Ana- lyzer. The XL2 reads the sensitivity and remembers this value. Afterwards connect the audio cable.

weather-protected measurement solution for the XL2 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. • M2230-WP: M2230 Microphone + WP30 Weather Protec- tion • M4261-WP: M4261 Microphone + WP61 Weather Protec- tion • Do not install the Outdoor Microphones M2230-WP and M4261-WP in horizontal di- rection. Raindrops may damage the measure- ment microphone. • The snap mechanism works only at tempera- tures above -15°C / 5°F (as the O-Ring stiff- ens). In colder conditions we suggest you warm up the housing first, e.g. with your hands. Bird Spike 90 mm Wind Screen Upper Body Tube Lower Body Tube Footer Plate with tripod mounting thread Inside: Measurement Microphone Inside: Protection Cage with water-repellent membrane

Class 1 requirements according to IEC 61672 and ANSI S1.4 for vertical sound incidence. For compliance with horizontal sound incidence a spectral correction is employed in the associated XL2 Sound Level Meter. The M2230-WP consists of the M2230 Microphone and the WP30 Weather Protection. An existing M2230 microphone can thus be converted to an M2230-WP by enclosing the micro- phone in the WP30 Weather Protection. • Always activate the frequency correction filter in the XL2 when measuring a horizon- tal sound incidence (sound source from the side) with the M2230-WP. The filter ensures that the measurements accuracy meets the class 1 requirements of IEC 61672 and ANSI S1.4. • Deactivate the filter only if you are measur- ing a vertical sound incidence (sound source from above e.g. airplane noise). Alternatively the Measurement Microphone M2211 or M2215 can be fitted into the Weather Protection WP30. These micro- phones have to be pushed further into the upper body by 3 mm. The top part of the capsule has to be 13 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 to IEC 61672 and ANSI S1.4. It consists of an M4261 Microphone and the WP61 Weather Protection.

phone into the weather protection kit: Install ASD Cable • Feed the female XLR of the ASD Cable through the bottom of the lower body tube. • Attach the footer plate to the lower body tube using the three allen screws, feeding the cable through the side slot of the footer plate. 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 with the bottom end of the upper body tube. Align the fixing screw hole of the upper body tube with the lower screw of the measurement microphone (remove the fixing screw to see the lower screw head through the fixing screw hole). Fixing Screw Hole Lower screw of measurement microphone

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 feel the fixing screw center in the head of the lower screw of the microphone. Do not over tighten the fixing screw. • Again verify that the bottom end of the inserted M2230 mi- crophone is in line with the bottom end of the upper body tube. In Line Assemble the Weather Protection Body Retract the ASD cable through the lower body tube and screw the lower body tube to the upper tube, ensuring that the cable does not twist during this operation.

The top section of the weather protection kit consists of the wind screen, the enclosed protection cage with water-repel- lent 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 au- dible click.  You have successfully assembled the Outdoor Measure- ment Microphone. Calibration The design of the Outdoor Measurement Microphone sup- ports 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 Out- door Microphone by gently pulling the bird spike upwards. At the same time gently push up on the cage inside the wind screen with two fingers of your other hand. You will feel when the snap mechanism is released. Gently remove the top section. Push Pull

ual using the NTi Audio Precision Calibrator. • Snap the top section back into position on the body tube.  You have successfully calibrated the Outdoor Measure- ment Microphone. • The outdoor windscreen is recommended to be replaced annually. The “WP30/WP61 Windscreen Replacement” includes two spare windscreens, NTi Audio # 600 040 061. • The water-repellent membrane in the top sec- tion is mounted with two O-Rings. Inspect these O-Rings (13x1 mm) and the membrane annually for proper seating and good condi- tion. Do not touch the water-repellent mem- brane.

• The top section is snapped on to the body tube. Remove the top section by gently pulling the bird spike upwards. At the same time gently push up on the cage inside the wind screen with two fingers of your other hand. You will feel when the snap mechanism is released. • Gently remove the top section and turn the top section up- side down and hold it by the bird spike. • Gently unscrew the cage from the hole of the wind screen. Do not touch the water-repellent membrane! • Assemble in reverse order. Capsule Replacement Instruction The microphones for the XL2 Analyzer include an electronic data sheet. The Automated Sensor Detection (ASD) of the XL2 Analyzer automatically reads this data, i.e. the microphone model and calibration data. This promotes faster setup and en- sures accurate measurements. In case of a capsule replace- ment needs the electronic data sheet to be updated with the data of the new capsule. 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 at https://my.nti-audio.com/support/xl2. • Start the XL2 Projector PRO Software. The computer re- quires 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-Port on the XL2) • Press the computer keyboard keys “Ctrl + Shift + F5” at the same time (alternatively “Ctrl + Alt + F5”)

phone. • Case: 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 good order. • Case: Custom microphone - Enter the microphone sensitivity - Confirm by clicking Write to MA220. - Now XL2 stores the microphone sensitivity as factory sen- sitivity in the electronic data sheet of the MA220 PreAm- plifier. • 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.

Protect your M2230 microphone from rain, wind, dust and perching birds with this professional outdoor weather protec- tion kit. Ideal for precise acquisition of environmental noise data in outdoor ap- plications. Features • Class 1 compliant with IEC 61672 and ANSI S1.4 for vertical and horizontal sound incidence • Protection from rain and dust (IP54), wind and perching birds • Built from corrosion-free materials • Removable top section for easy micro- phone calibration • Standard 3/8” tripod mount • Weight: 270 g (9.5 oz.) • Optional sturdy outdoor carrying case available NTi Audio # 600 040 060 WP61 Weather Protection for M4261 Protect your M4261 microphone from rain, wind, dust and perching birds with this professional outdoor weather protec- tion kit. Features • Class 2 compliant with IEC 61672 and ANSI S1.4 for vertical and horizontal sound incidence • Protection from rain and dust (IP54), wind and perching birds • Built from corrosion-free materials • Removable top section for easy micro- phone calibration • Standard 3/8” tripod mount • Weight: 270 g (9.5 oz.) • Optional sturdy outdoor carrying case available NTi Audio # 600 040 080

The battery-operated Class 1 Sound Calibrator is classified for the calibration of class 1 measurement microphones, sound level 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 1/4” adapter ADP-1/4-P is required to fit 1/4” measurement micro- phones. NTi Audio #: 600 000 391 Class 2 Sound Calibrator The battery-operated Class 2 Sound Calibrator is classified for the calibration of class 2 measurement microphones, sound level meters and other acoustic measurement equipment. This micro- phone calibrator delivers 114 dB at a fre- quency of 1 kHz. NTi Audio #: 600 000 394 Calibration Certificate Manufacturer Calibration Certificate The calibration certificate lists the individ- ual 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 in- strument is recommended ensuring ac- curate measurements. NTi Audio # 600 000 018 Lightweight Tripod Retractable, lightweight tripod with 1/4” ball head and 3/8” mounting thread. The flexible ball head mounts the XL2 Ana- lyzer at any angle. The tripod is suitable for all measurement microphones, the outdoor microphone M2230-WP and the TalkBox. NTi Audio #: 600 000 397 1/2” Windscreen 90mm for M2211, M2215 and M2230 measure- ment microphone NTi Audio #: 600 040 109

The replacement package contains two spare windscreens for the outdoor mea- surement microphone M2230-WP or WP30. The outdoor windscreen is recom- mended to be replaced annually. NTi Audio #: 600 040 061 ASD Cable The ASD Cable allows for extended con- nections of the NTi Audio measurement microphones. It supports the transfer of the electronic data sheet from the micro- phone to the XL2 Analyzer. NTi Audio #: • 5 meter (16 feet): 600 000 336 • 10 meter (32 feet): 600 000 364 • 20 meter (64 feet): 600 000 365 The ASD technology for the electronic data sheet transfer is applicable for cable length until 20 meter (64 feet). 1 1 2 2 3 3 Housing Housing ASD STARQUAD cable with low capacitive load do not connect Capacity between ASD line and shield total < 2.7nF

Register your instruments at My NTi Audio and benefit 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 • Tracing support in case of loss or theft • Calibration support How to Register • Open the web page “https://my.nti-audio.com”. • You are prompted to login or create your My NTi Audio account. • The web page “My NTi Audio Products” opens. • Select the product type and enter the serial number. • Confirm with “Register”. • Now your product is listed in the table “My Products“.  Congratulations, your NTi Audio product is registered

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. 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 prod- ucts are optional. NTi Audio recommends annual calibration of the products af- ter the purchase. The calibration provides documented and traceable measurement accuracy and confirms that your NTi Audio product meets or exceeds the published specifica- tions. The calibration and adjustment procedures follow the documentation and traceability requirements of the standard EN ISO / IEC 17025. For calibrations kindly follow the service guidelines at www.nti-audio.com/service. Service and Repairs If your product is not functioning correctly or is damaged, please contact the local NTi Audio partner for assistance. If the product needs to be returned for service, kindly follow the service guidelines at www.nti-audio.com/service.

dividual components for a period of one year from the date of sale. During this period, defective products will either be repaired free of charge or replaced. Limitations These guarantee provisions do not cover damage caused by ac- cidents, transportation, incorrect use, carelessness, non-origi- nal 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. 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. Declaration of Conformity CE / FCC Compliance Statement We, the manufacturer NTi Audio AG, Im alten Riet 102, 9494 Schaan, Liechtenstein, do hereby declare that the measure- ment microphones M2230, M2211, M2215, M4261, the pre- amplifier MA220 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 and electronic 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: 31. July 2019 Position: COO

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

M2230 M2211 M2215 High SPL M4261 Classification with XL2 accord- ing to IEC 61672, ANSI S1.4 Class 1 Certified Frequency Response Class 1 Class 2 Consisting of PreAmplfier MA220 + MC230 or MC230A Capsule PreAmplfier MA220 + Capsule 7052 PreAmplfier MA220 + Capsule 7056 M4261 microphone with per- manently installed capsule Microphone Type Omnidirectional, pre-polarized condenser, free field microphone Capsule / Transducer 1/2” detachable with 60UNS2 thread, type WS2F according IEC 61094-4 1/4” permanently installed PreAmplifier Type MA220 - Flatness tolerance bands 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 +1/-4.5 dB @ 5 Hz - 20 Hz ±1.5 dB @ >20 Hz - 4 kHz ±3 dB @ >4 kHz - 10 kHz ±4.5 dB @ >10 kHz - 16 kHz ±5 dB @ >16 kHz - 20 kHz Actual Frequency Response freely available as Excel-data, register microphone at My NTi Audio and contact [email protected] Frequency Range 5 Hz - 20 kHz Residual Noise Floor typical 16 dB(A) 21 dB(A) 25 dB(A) 27 dB(A) Maximum SPL @ THD 3%, 1 kHz, S_typical 137 dBSPL 144 dBSPL 153 dBSPL 142 dBSPL Sensitivity typical @ 1 kHz -27.5 dBV/Pa ±2 dB (42 mV/Pa) -34 dBV/Pa ±3 dB (20 mV/Pa) -42 dBV/Pa ±3 dB (8 mV/Pa) -36 dBV/Pa ±3 dB (16 mV/Pa)

< ±0.015 dB / °C < ±0.02 dB / °C Temperature Range -10°C to +50°C (14°F to 122°F) 0°C to +40°C (32°F to 104°F) Pressure Coefficient -0.005 dB / kPa -0.02 dB / kPa -0.04 dB / kPa Influence of Humidity (non-condensing) < ±0.05 dB < ±0.4 dB Humidity 5% to 90% RH, non-condensing Long-term Stability > 250 years / dB - Power Supply 48 VDC phantom power Current Consumption 2.3 mA typical 1.7 mA typical Electronic Data Sheet NTi Audio ASD in accordance with IEEE P1451.4 V1.0, Class 2, Template 27 Output Impedance 100 Ohm balanced Connector Balanced 3-pole XLR Diameter Dimensions 20.5 mm (0.8”) 20.5 mm (0.8”) Length Dimensions 154 mm (6.1”) 150 mm (5.9”) Weight 100 g, 3.53 oz 100 g, 3.53 oz 83 g, 2.93 oz Environmental Protection IP51 IP51 NTi Audio # 600 040 050 600 040 022 600 040 045 600 040 070

M2230-WP (M2230+WP30) M4261-WP (M4261+WP61) Classification with XL2 accord- ing to IEC 61672, ANSI S1.4 Class 1 Certified Class 2 Consisting of PreAmplfier MA220 + MC230 or MC230A Capsule + WP30 Weather Protection M4261 Microphone with permanently installed capsule + WP61 Weather Protection Diameter Dimensions 36 mm (1.4”) 36 mm (1.4”) Length Dimensions 378 mm (14.9”) 378 mm (14.9”) Weight 430 g, 15.17 oz 430 g, 15.17 oz Environmental Protection IP54 in vertical position IP54 in vertical position NTi Audio # 600 040 050 + 600 040 060 600 040 070 + 600 040 080

(free field conditions @ reference direction 0°) log frequency [Hz] 10 100 1000 10000 Sensitivity relative [dB] 5 10 20 100 1000 10000 20000 8 6 4 2 0 -2 -4 -6 -8 Tolerance Class 1, IEC61672-1 M2230, M2211, M2210, M2215 M4261 Tolerance Class 2, IEC61672-1

If a measurement microphone is held in a free-field environ- ment, then the measurement microphone acts at high fre- quencies like a reflector. The sound pressure increases in front of the microphone capsule membrane. M2230, M2211 and M2215 are free-field equalized measurement microphones, they compensate for the increased pressure internally. The calibrator offers no longer free-field conditions. Therefore, the free-field equalization of the microphone must be compen- sated. This needs to be considered prior the calibration. The correction value needs to be added to the pressure response of the microphone. Example: • During the calibration, the XL2 measures the sound level in the calibrator. If the B&K4226 calibrator is used and it is set to 16 kHz, then the XL2+M2230 reads just 86.7 dBA. • The free-field sound level is calculated by summing the XL2 measurement value and the correction value (= 86.7 dB + 7.3 dB = 94.0 dB). The following corrections apply with the B&K4226 calibrator: Nominal Fre- quency [Hz] M2230 Measurement Microphone [dB] M2211 Measurement Microphone [dB] M2215 Measurement Microphone [dB] Measurement Uncertainty U [dB] 31.5 63 125 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.3 0.3 250 500 1000 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.3 0.3 0.3 2000 4000 8000 0.3 0.7 2.6 0.6 1.7 4.2 0.2 1.2 3.9 0.3 0.3 0.4 12500 16000 6.0 7.3 7.3 9.2 6.7 9.0 0.7 0.8 Correction values for other calibrators for M2230: Type Correction Value Calibration Frequency Calibration Level NTi Audio CAL200 -0.1 1 kHz 114 dB B&K 4231 -0.2 1 kHz 114 dB Norsonic Nor-1251 -0.2 1 kHz 114 dB

A diffuse sound field is characterized by the sound arriving at the receiver from all directions with more or less equal prob- ability. The M2230, M2211, M2215 and M4261 are free-field equalized measurement microphones. The default frequency response refers to a 0° sound incidence. The diffuse-field fre- quency response is calculated by averaging the directional char- acteristics; this results in a reduction at the high frequencies. The individual third-octave band correction values for diffuse- field conditions are documented in the following table. The di- rectional response of the M2230 is described in the appendix. Example: • The sound pressure level in a diffuse sound field shall be determined. The display of the XL2 with the M2230 reads 80.0 dBA for the 20 kHz third-octave band. • The diffuse sound level is now calculated from the sum of the XL2 measurement value and the correction value (80.0 dB + 8.7 dB = 88.7 dB). This correction is not necessary using a diffuse field equalized measurement microphone. Nominal Frequency [Hz] 1/2” Microphone M2230, M2211, M2215 [dB] 1/4” Microphone M4261 [dB] <63 63 80 0.0 0.0 0.0 0.0 0.0 0.0 100 125 160 0.0 0.0 0.0 0.0 0.0 0.0 200 250 315 0.0 0.1 0.1 0.0 0.0 0.0 400 500 630 0.1 0.1 0.1 0.0 0.1 0.1 800 1000 1250 0.2 0.2 0.3 0.1 0.1 0.1 1600 2000 2500 0.4 0.5 0.6 0.1 0.1 0.2 3150 4000 5000 0.8 1.1 1.4 0.2 0.3 0.5 6300 8000 10000 1.9 2.5 3.4 0.7 1.0 1.4 12500 16000 20000 4.6 6.4 8.7 1.9 2.5 3.2

log frequency [Hz] sensitivity relative [dB] 10 20 100 1000 10000 20000 Idealized Free Field Pressure Diffuse Field 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10

The outdoor microphone M2230-WP fulfills Class 1 require- ments of IEC 61672 and ANSI S1.4 for vertical sound incidence. For compliance with horizontal sound incidence a spectral cor- rection is employed in the associated XL2 Sound Level Meter. Nominal Frequency [Hz] Spectral Correction for horizontal Sound Incidents with Firmware V4.20 or higher [dB] 1/3 Octave 1/1 Octave <800 0.0 0.0 800 1000 1250 0.0 0.0 0.1 0.0 1600 2000 2500 0.1 0.3 0.7 0.4 3150 4000 5000 1.3 2.0 2.6 2.1 6300 8000 10000 2.7 3.2 3.7 3.3 12500 16000 20000 4.3 6.1 6.4 5.9

MA220 PreAmplifier Microphone PreAmplifier Compatible with 1/2” microphone capsules type WS2F in accordance with IEC61094-4 Frequency Range 4 Hz - 100 kHz Residual Noise Floor typical 1.6 mV(A) at C_in 18pF ≙ 12 dBA @ 20 mV/Pa Frequency Response Flatness ±0.2 dB Phase Linearity < 1° @ 20 Hz - 20 kHz Maximum Output Voltage 21 Vpp ≙ 7.4 Vrms ≙ 145 dBSPL @ 20 mV/Pa, THD 3%, 1 kHz Electronic 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 Input: 20 GOhm // 0.26 pF, Output: 100 Ohm balanced Power Supply 48 VDC phantom power, 2.3 mA typical Attenuation < 0.17 dB (Rphantom 2x 6.8 kOhm) Connector Balanced 3-pole XLR Thread for Capsule 60 UNS2 Weight 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) Humidity 5% to 90% RH, non-condensing NTi Audio # 600 040 040 The product specifications may vary based on the mounted microphone capsule type.