BLM4060 Boundary Layer Microphone

 

• ideal for use in boardrooms, conference facilities, courtrooms, teleconferencing

• optimized to boost speech intelligibility

• works with a wide range of connection adapters and power supplies  

• The BLM4060 Boundary Layer Microphone is ideal for use in boardrooms, conference facilities, courtrooms, teleconferencing and other applications where excellent vocal pickup is required.

  Microphone
  The BLM4060 is a transducer designed to work under optimum conditions when placed on a tabletop, but it also performs well on any other hard, flat surface that reflects sound. The microphone element is a prepolarized 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 centre rubber disc that holds the microphone element mounted in an elegant stainless steel base. The BLM4060 has a 3 m (10 ft) cable.

  Position
  The BLM4060 can be very easily placed in essentially any position on the surface, even close to the edge (See graphs & more). Users will benefit from the special characteristics of the surrounding sound field on which the BLM4060 is mounted: a 6 dB gain of direct sound and only 3 dB gain of the diffuse sound. Therefore, the sound captured has both a greater clarity – especially at high frequencies – and speech intelligibility compared to sound captured above the surface.

  Accessories
  A wide range of connection adapters and power supplies makes it possible to use the BLM4060 with any microphone input. It is delivered with a DAD6001 adapter. 

   

  Specifications for BLM4060 Boundary Layer Microphone

  Directional characteristics:		Omnidirectional, hemisphere
  Principle of operation:		Pressure
  Cartridge type:		Pre-polarized condenser element
  Frequency range, ± 2 dB:		20 Hz – 14 kHz (with 7 a dB soft boost at 8 kHz)
  Sensitivity, nominal, ±3 dB:		20 mV Pa at 1 kHz; -34 dB re. 1 V Pa
  Equivalent noise level A-weighted:		Typ. 23 dB(A) re. 20 µPa (max. 26 dB)
  Equiv. noise level ITU-R BS.468-4:		Typ. 35 dB (max. 38 dB)
  S N ratio, re. 1 kHz at 1 Pa (94 dB SPL):		71 dB(A)
  Total harmonic distortion (THD):		< 1 % up to 123 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 DAD6011-BC DAD6024 DAD4099: 48 V phantom power ±4 V for full performance.
  Connector:		MicroDot XLR 3-pin
  Microphone weight:		240 g (8.5 oz) excl. cable
  Microphone diameter:		100 mm (4 in)
  Microphone height:		Height: 12 mm (0.5 in)
  Cable length:		3 m (10 ft)
  Cable color:		Black
  Cable diameter:		1.6 mm (0.06 in)
  Finish:		Black rubber disc mounted in stainless steel base
  Polarity:		Positively increasing sound pressure produces positive going voltage on MicroDot pin pin 2 on XLR connector
  Operating temperature range:		-10 to 45°C (14 to 113° F)

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