DPA BLM4060 Manuel utilisateur
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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