DPA d:sign™ 4060 Omni Boundary Layer Mic, XLR
DPA d:sign™ 4060 Omni Boundary Layer Mic, XLR
DPA d:sign™ 4060 Omni Boundary Layer Mic, XLR

DPA d:sign™ 4060 Omni Boundary Layer Mic, XLR

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Optimized to boost speech intelligibility

  • Ideal for use in boardrooms and conference facilities
  • Sleek low profile Scandinavian Design
  • Optimized to boost speech intelligibility
  • Modular adapter system fits most professional wireless systems

This mic solution is ideal for use in boardrooms, conference facilities, and courtrooms. It is also a great solution for teleconferencing and other applications where excellent vocal pickup is required.

The d:sign™ BLM4060 Boundary Layer Microphone 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 is a pre-polarized omnidirectional miniature condenser microphone with a 5.4 mm (0.2 in) vertical diaphragm. The mic body consists of a central rubber disc that holds the mic element mounted in an elegant stainless steel base. It comes with a detachable 3 m (10 ft) cable.

The d:sign™ BLM4060 Boundary Layer Microphone can be very easily placed in essentially any position on the surface of a table, even close to the edge. Users will benefit from the special characteristics of the surrounding sound field on which the mic is mounted: a 6 dB gain of direct sound and only a 3 dB gain of the diffuse sound. The sound captured has both greater clarity, especially at high frequencies, and speech intelligibility compared to sound captured above the surface.

A wide range of connection adapters and power supplies makes it possible to use the d:sign™ BLM4060 Boundary Layer Microphone with any microphone input. It is delivered with a DAD6001 XLR Adapter, but as the supplied cable is terminated with a DPA MicroDot connector this microphone can be connected to a wireless system via the flexible adapter system.

(This microphone was previously known as the d:screet™ BLM4060 Boundary Layer Microphone.)

Adapter system gives you flexibility

The adapters for wireless systems give you flexible, simple and affordable possibilities. You are no longer bound to one wireless system. As circumstances change, you can just switch your adapter, instead of incurring the cost of a completely new microphone. When you make the switch, you won't hear any loss or change in sound quality.

The d:fine™, d:screet™ and d:vote™ series of miniature microphones work with all leading wireless mic solutions, such as Lectrosonics, Sennheiser, Shure, Sony, Wisycom, Zaxcom and many more. DPA Microphones’ ingenious adapter system is one of a kind in the industry. It protects your investment in fantastic sound for years to come.


  • Directional pattern Omnidirectional, hemisphere
  • Principle of operation Pressure
  • Cartridge type Pre-polarized condenser
  • Frequency range 20 Hz - 20 kHz
  • Frequency range, ±2 dB 20 Hz - 14 kHz, with 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 1 Pa (94 dB SPL) 71 dB(A)
  • Total harmonic distortion (THD) < 1% up to 123 dB SPL peak
  • Dynamic range Typ. 100 dB
  • Max. SPL, peak before clipping 134 dB
  • Output impedance From MicroDot: 30 - 40 Ω. From DAD6001: 100 Ω
  • Cable drive capability Up to 300 m (984 ft)
  • Power supply (for full performance) Min. 5 V to max. 50 V through DPA adapter for wireless systems
  • or 48 V phantom power ±4 V with DAD6001-BC XLR adapter
  • Connector MicroDot or XLR 3-pin
  • Color Black rubber disc mounted in stainless steel base
  • Weight 240 g (8.5 oz) excl. Cable
  • Microphone diameter 12 mm (0.47 in)
  • Microphone length 100 mm (4 in)
  • Cable length 3 m (10 ft)
  • Cable color Black
  • Cable diameter 1.6 mm (0.06 in)
  • Polarity Positively increasing sound pressure produces positive-going voltage on MicroDot pin/pin 2 on XLR connector
  • Temperature range -40°C to 45°C (-40°F to 113°F)
  • Relative humidity (RH) Up to 90%

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