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AKG C 542 BL

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This item has either been discontinued by the manufacturer or is no longer available to purchase on our website.

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(800) 771-8330

Extremely High Quality Boundary Layer Microphone


The C 542 BL is a high quality boundary microphone designed to deliver superior results for a multitude of recording applications. The boundary layer technique is well-known for recording and offers non-directional pickup that is frequency independent.

Succeeding the proven C 562 BL, the C 542 BL is small, lightweight and easy to place - no stand is needed. Since the transducer sits in a metal plate only 5 mm (0.2 in) thick, the plate doesn't interfere with or color the sound. Frequency response is very uniform within its hemisphere and it captures the "room sound'' of an instrument very accurately.

The C 542 BL can be permanently attached to the floor or wall of a studio using the screw holes in the plate or attached temporarily using the supplied adhesive compound. Its 3-pin output connector also has a switchable bass-cut filter to minimize surface-born noise.

Easy to use and sonically versatile, the C 542 BL is a great addition to the "mic locker'' of any studio.


  • Extremely small and inconspicuous, lightweight yet rugged

  • Delivers superior sound combined with outstanding ease of use

  • High sensitivity and low self-noise ensures generous headroom


  • Polar pattern: omnidirectional (hemispherical)

  • Frequency range: 20 Hz to 20 kHz

  • Sensitivity: 20 mV/Pa (-34 dBV)

  • Max. SPL for 1% THD: 130 dB

  • Equivalent noise level: (CCIR 468-3): 26 dB

  • Equivalent noise level: 16 dB-A

  • Signal/noise ratio (A-weighted): 78 dB

  • Bass cut filter: switchable flat or 150 Hz, 12 dB/octave

  • Electrical impedance: < 600 ohms

  • Recommended load impedance: ™ 2.000 ohms

  • Powering: 9 to 52 V phantom power to DIN 45 596

  • Current consumption: < 2 mA

  • Connector: 3-pin XLR

  • Finish: dark gray

  • Size: 80 dia. x 5 (10) mm (3.1 x 0.2/0.4 in.)

  • Net weight (w/o cable): 56 g (2 oz.)

  • Standard accessories: fixed 3-m (10-ft.) connecting cable with XLR connector, adhesive compound

  • Optional accessories: B 18 battery power supply


Q & A

C 542 BL
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0.50 lbs.
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