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AKG C 400 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 Small Hypercardioid Boundary Layer Condenser Microphone


The AKG Model C 400 BL is a unidirectional boundary layer microphone intended for table top use. The microphone's frequency range has been tailored for speech applications through a gentle bass roll-off below 200 Hz and a slight high frequency peak centered at 6 kHz, with a gentle roll-off above that frequency.

The combination of both narrow pickup angle and frequency response limited to the voice range makes the microphone doubly insensitive to ambient noise, a design known as DNC (Dual Noise Canceling).

The microphone has a high sensitivity of 13.5 mV/Pa and is available with either a 3-pin XLR connector or a B-lock jack for the Model C 400 BL/1. The microphone is universally phantom powered over the range from 9 to 52 volts dc. Cable length is 5 feet (1.5 meters).

The microphone's matte black finish can be painted to match surrounding decor.


  • Small & inconspicuous

  • Speech optimized

  • Unidirectional pickup

  • Repaintable


  • Transducer Principle: Condenser prepolarized

  • Frequency Range: 40-14,000 Hz

  • Polar Pattern: Hypercardioid

  • Sensitivity at 1,000 Hz: 13.5 mV/Pa (-37 dBV)

  • Equivalent Noise Level: < 32 dB-A

  • Sound Pressure Level for 1% THD: 115 dB

  • S/N Ratio (A-weighted) :> 62 dB

  • Electr. Impedance: < 200 ohms

  • Load Impedance: > 2,000 ohms

  • Power Requirement: 1.5 to 15 volts

  • Connector: 3-Pin XLR-type (B-Lock Jack for C 400 BL-1)

  • Cable Length: 5 ft. (1.5 m)

  • Finish: Non-reflective black

  • Size: 1.7 x 0.9 x 0.5 in. (43 x 23 x 13 mm)

  • Net Weight: 0.2 oz. (5.5 g)

  • Included Accessories: Clip-on mounting plate, Phantom power adapter (for C 400 BL)

  • Optional Accessories: B 18 Battery power supply

Q & A

C 400 BL
MFR Part Number
Product Category
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Shipping Weight
0.50 lbs.
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