DPA BLM4060 Bedienungsanleitung

User’s Manual

BLM4060

Boundary Layer Microphone

BLM4060 Boundary Layer Microphone

With its elegant look and excellent performance, the BLM4060 Boundary Layer

Microphone is the perfect microphone in boardrooms, conference facilities, court-

rooms, teleconferencing and other places for audio reinforcement or recording. This

microphone is particularly excellent for pick-up of the voice.

The BLM4060 is designed to work under optimum conditions when placed on a

table top, but it also performs well on any other hard, ﬂat surface.

The advantages of this microphone are the ease of placement in combination with

the high sensitivity and a wide dynamic range.

Design

The microphone element is a pre-polarized omnidirectional miniature condenser

microphone with a 5.4 mm (0.2 in) vertical diaphragm specially designed for maximum

performance. The microphone body consists of a center rubber disc that holds the

microphone element mounted in an elegant stainless steel base.

The 3 m (10 ft) cable provided with this microphone is slim and strong and ter-

minated on both ends with a MicroDot connector.

The microphone’s size taken into consideration, DPA has obtained an outstanding

noise ﬂoor of 23 dB(A) re. 20 µPa and an impressive sensitivity of 20 mV/Pa. If

powered correctly, the microphone will be able to handle sound pressure levels

up to 134 dB SPL before clipping occurs.

A wide range of connection adapters and power supplies makes it possible to use

the BLM4060 with any microphone input.

How to connect the cable

Take the microphone in one hand and the microphone cable in the other. Hold the

microphone in a horizontal position keeping the topside up. The connectors are as-

sembled by leading the male part into its female counterpart.

Female connector on the micro-

phone body.

The MicroDot connector is as-

sembled from the topside of the

microphone.

The cable is connected to the mi-

crophone by turning the lock cap

clockwise.

Make sure the thread is ﬁrmly

tightened.

The MicroDot lock cap is turned clockwise and tightened ﬁrmly to the female con-

nector.

How it works

The BLM4060 Boundary Layer Microphone is a transducer that should always be placed on

a surface that reﬂects sound. By doing this you will beneﬁt from the special characteristics of

the sound ﬁeld found here: a 6 dB gain of direct sound and only 3 dB gain of the diffuse

sound. Hence, the sound captured has both a greater clarity and intelligibility compared to

sound captured above the surface.

How to use it

The microphone can be placed on any surface that reﬂects sound, i.e. tables, speaker podi-

ums, etc. Even if a table is covered with a cloth, the BLM4060 will work due to the shape

and size of the disc.

The microphone has been designed to secure high frequency clarity and speech

intelligibility under most conditions.

The low frequency response is to some extent dependant on the area of the boundary.

However, for speech pick-up even small areas like podiums are adequate.

The microphone can be placed in essentially any position on the surface, even close to the

edge. However, try to avoid a placement that may receive reﬂections from vertical faces as

this may cause coloration of the sound (comb-ﬁltering).

For tables longer than 6 m (20 ft), it is recommended to use more than one

BLM4060.

Speciﬁcations

Directional characteristics

Omnidirectional, hemisphere

Principle of operation

Pressure

Cartridge type

Pre-polarized condenser element

Frequency range, ± 2 dB

20 Hz – 14 kHz

(with a 7 dB soft boost at 8 KHz)

Sensitivity, nominal ± 3 dB at 1 kHz

20 mV/Pa -34 dB re. 1 V/Pa

Equivalent noise level, A-weighted

Typ. 23 dB(A) re. 20 µPa (max. 26 dB(A))

Equivalent noise level ITU-R BS.468-4

Typ. 35 dB (max. 38 dB)

S/N ratio, (A-weighted) re. 1 kHz at Pa (94 dB SPL)

71 dB(A)

Total Harmonic Distortion (THD)

<1% up to123 dB SPL peak

<1% up to 120 dB SPL RMS sine

Dynamic range

Typ. 100 dB

Max. SPL, peak before clipping

134 dB

Output impedance

From MicroDot: 30 – 40 ohm

From DAD6001: 100 ohm

Cable drive capability

Up to 300 m (984 ft)

Power supply

For wireless systems: Min. 5 V – max. 50 V through

DPA adapter

With DAD6001-BC/DAD6024/DAD4099:

48 V phantom power ±4 V for full performance

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