beyerdynamic DV247 MM 1 Measurement Microphone User Manual

: June 13, 2024
: beyerdynamic

Table of Contents

SAFETY INSTRUCTIONS
BOX CONTENTS
OPTIONAL ACCESSORY
FEATURES
APPLICATION
TECHNICAL SPECIFICATIONS
FREQUENCY RESPONSE & POLAR PATTERN
INSTALLATION AND OPERATION
MAINTENANCE
DISPOSAL
TROUBLESHOOTING AND SERVICE
FURTHER INFORMATION
WARRANTY
CONFORMITY
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

**beyerdynamic DV247 MM 1 Measurement Microphone User Manual

**

You have chosen the MM 1 measurement microphone from beyerdynamic.
Thank you for your confidence in our M series.

In this user manual you will find important information on the use of your product. Please take sufficient time to read them.

ENJOY THE SOUND!
Your beyerdynamic Microphone Team

SAFETY INSTRUCTIONS

Read this user manual and the safety instructions carefully before using the product.
Do not use the product if it is damaged.
Lay cables in such a way that no one can trip over the cables and that the device cannot be damaged.
Repairs may only be carried out by authorised specialists. Never open the microphone yourself. For devices that have been opened by the customer the warranty will invalidate.
Do not expose the product to rain, snow, liquids or moisture.
Use the device only under the conditions specified in the technical specifications.
Only use accessories and spare parts approved by the manufacturer.
Reduce the volume on the connected playback devices to prevent hearing damage, acoustic feedback and damage to the loudspeakers.

Intended use

Do not use the product in any way other than as described in this product manual. beyerdynamic accepts no liability for improper use of the product or its accessories.

Liability

beyerdynamic GmbH & Co. KG accepts no liability for damage to the product or injury to persons due to careless, improper or incorrect use, that is not in accordance with the purpose stated by the manufacturer.

BOX CONTENTS

1 χ MM 1 microphone
1 χ MA-CL 21 microphone clamp
Storage case
Individual measurement chart
“M Series Guide” info sheet
Technical specifications on the M series

OPTIONAL ACCESSORY

WS 10 AZ Wind shield, Colour: charcoal-grey . . . . . Order # 403.008

FEATURES

Ideal for acoustic measurement in different environments
Linear frequency response at 90° (diffuse field calibrated)
Low tolerance ± 1.5 dB in the range between 50 Hz to 16,000 Hz
Individual calibration data for 0° and 90° free-field measurement available upon request
Simple calibration of several loudspeakers in the (home) studio
Slim housing with protruding microphone capsule for minimum influence on the acoustic environment
Handcrafted in Germany

APPLICATION

The MM 1 has been developed for the calibration of studio rooms, PA and ELA systems. In conjunction with a spectrum analyser, the sound pressure levels of loudspeakers can be checked in addition to frequency response measurements. Due to the slim housing with the protruding microphone capsule, the influence on the sound field is very low, so that a pressure build-up at high frequencies is mostly avoided. The transmission pattern is selected so that an exactly linear frequency response is achieved with diffuse sound input. This makes the calibration of several loudspeakers in the studio particularly easy and fast.

The MM 1 also provides valuable services when investigating sound signals in research, development and industry.

TECHNICAL SPECIFICATIONS

Transducer type . . . . . . . . . . . Condenser (back electret)
Operating principle . . . . . . . . . . . Pressure
Frequency response . . . . . . . . . . . 20 – 20,000 Hz (50 – 16,000 Hz ± 1.5 dB) diffuse field calibrated
Polar pattern . . . . . . . . . . . Omnidirectional Sensitivity
(0 dB = 1 V/Pa) . . . . . . . . . . . 15 mV/Pa (= -36.5 dBV) ± 1 dB
Nominal impedance . . . . . . . . . . . 160 Ω
Load impedance . . . . . . . . . . . ≥ 2.2 kΩ Max. SPL at f = 1 kHz, k = 1%, RL
= 2.2 kΩ . . . . . . . . . . . 122 dBSPL
Signal-to-noise ratio rel. to 1 Pa . . . . . . . . . . . > 57 dB
A-weighted equivalent SPL . . . . . . . . . . . approx. 26 dB(A)
Power supply . . . . . . . . . . . 12 – 48 V phantom power
Current consumption . . . . . . . . . . . approx. 1.9 mA
Output . . . . . . . . . . . electronically balanced
Connection . . . . . . . . . . . 3-pin XLR, male
Dimensions:
Length . . . . . . . . . . . 139 mm
Shaft diameter . . . . . . . . . . . 19 mm
Head diameter . . . . . . . . . . . 9 mm
Weight . . . . . . . . . . . 73 g

FREQUENCY RESPONSE & POLAR PATTERN

The displayed frequency response curve and polar pattern correspond to a typical production sample for this microphone. Each microphone comes with an individual 0° frequency response. The individual compensation curves for 0° and 90° free-field measurement can be requested via the following link: www.beyerdynamic.com/mm1-register
FREQUENCY PATTERN

INSTALLATION AND OPERATION

Connection

The MM 1 is equipped with a 3-pin XLR connector. You can connect it to any microphone input with phantom power (12 – 48 V) with a suitable microphone cable. Activate phantom power for this purpose.
Caution: Carelessly laid cables are a trip hazard. People can be injured and the microphone can be damaged.

Operation

When setting up the MM 1, make sure that there are no large objects close to the microphone, which could influence the sound field and place the microphone clamp as far down as possible.
Note on the calibration of loudspeakers in studio rooms:
When measuring loudspeakers and other sound sources with a high direct sound level, you should set up the MM 1 so that the microphone axis is at 90° to the sound source (see illustration below). This ensures a linear recording with all frequencies. With direct sound input from the front, a slight pressure build-up becomes evident at frequencies above 10 kHz. This leads to a boost at high frequencies (refer to the frequency response curve at 0°). With lower frequencies, there is no pressure build-up and the polar pattern is exactly omnidirectional.
Depending on the alignment of the microphone to the sound source, you should use the appropriate calibration file. The individual compensation curves of the 0° and 90° free-field measurement of your MM 1 can be requested from beyerdynamic free of charge, stating your serial number: https://www.beyerdynamic.com/formulare/konferenztechnik/mm1-register
The MM 1 is supplied with the MA-CL 21 microphone clamp for tripods with 3/8″ thread. For tripods with a 5/8″ thread, you can unscrew the threaded insert.
Caution: A tripod with an insecure stand can fall over and damage a microphone mounted on it. Make sure the tripod stands stable.

MAINTENANCE

Use a soft cloth moistened with water to clean the microphone shaft.
Make sure that no water enters the microphone.
Do not use cleaning agents containing solvents.

DISPOSAL

This symbol on the product, in the operating instructions or on the packaging means that electrical and electronic devices must be disposed of separately from household waste at the end of their life cycle.
Always dispose of used equipment in accordance with applicable regulations.
Dealers for electronic equipment are generally obliged to take back waste electrical/electronic equipment free of charge. This obligation also applies to sales via remote communication.
For further information, please contact the local authorities or the dealer from whom the product was purchased.

TROUBLESHOOTING AND SERVICE

Should you have technical problems when using the microphone or should you need more instructions, please visit our FAQ website at https://support.beyerdynamic.com
In case of service, please contact authorised service personnel. Never open the microphone yourself, as this could invalidate all warranty claims. Please visit our website https://www.beyerdynamic.com for service and replacement parts.

FURTHER INFORMATION

If you need further information, please visit our website. On our product detail page https://www.beyerdynamic.com/mm-1.html
If you would like to learn more about beyerdynamic microphones for various applications, please visit https://www.beyerdynamic.com/microphones-made-in-germany

WARRANTY

beyerdynamic offers a limited warranty of 2 years on the purchased beyerdynamic product. The exact warranty conditions can be found on our website at https://www.beyerdynamic.com/service/warranty