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The B23 L is a compact power supply unit that provides 9V phantom power to the AKG MicroMic series.

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Two mini-XLR-F inputs (L and R) ensure optimum use for up to two microphones. Both inputs of the B23 L can be switched either to mono or stereo mode. The output is a standard 3.5mm stereo jack. Two AA batteries guarantee an average use of 30 hours. Another great feature of the B23 L is that it can be used as a small and portable mixer. Two separate volume controls allow the user to set the level of each microphone independently. Customers who want to compensate level differences between two audio sources (e.g. voice and instrument) will greatly benefit from this feature. On the rear panel of the B23 L there is the battery compartment and a metal clip for fixing the B23 L to a belt, guitar strap or the like. The B23 L is an attractive solution for customers who are looking for a small and portable power supply capable of mixing up to two audio signals in one device.

General Specifications

Frequency Response20 - 20000 Hz

Input ChannelsTwo mini XLR inputs

Output Channels3.5 mm stereo output jack (max. 55 VDC)

Max Input Level0 dBV

Max Output Level Stereo Line0 dBV +/- 1 dB @ 1 kHz < 0.1 %

Max Output Level Stereo Mic0 dBV +/- 1 dB @ 1 kHz < 1 %

Input Impedance5 kohms

Output Impedance200 ohms unbalanced

Max Input Attenuation Line50 dB +/- 1 dB (Volume control position 0)

Min Input Attenuation Line0 dB +/- 1 dB (Volume control position 10)

Max Input Attenuation Mic37 dB +/- 2 dB (Volume control position 0)

Max Mic Amplification30 dB +/- 2 dB (Volume control position 10)

Noise Line (Mono & Stereo)< 5 uV (A)

Noise MIC (Mono & Stereo)< 22 uV (A)

Power SupplyTwo AA alkaline or rechargeable batteries

Phantom Voltage9 V (open loop), 4 V (at 4,2 kOhm)

Power Consumption40 mA @ 3 VDC (line mode)

Lifespan of the Batteries30 - 50 h, depends on the battery capacity

Temperature Range-10 °C – 60 °C (14 °F - 140 °F)


Length 89 mm (3.5")

Width 70mm (2.75")

Height 26mm (1.02")

Weight 115 g (4.05 oz) (including batteries)

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