AKG CBL 99 Boundary Layer Microphone

AKG CBL99 hemispherical boundary layer microphone. Removed from a functional installation.

From the manufacturer:

The CBL99 is a hemispherical boundary layer microphone designed to deliver superior results for a multitude of recording applications.

The CBL99 is small, lightweight and easy to place. Since the transducer sits in a metal plate only 5mm 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 CBL99 requires 9V - 52V phantom power. Its output is unbalanced via a professional XLR connector with switchable bass-cut filter.

Polar pattern: omnidirectional (hemispherical)
Frequency range: 20 Hz to 20 kHz
Sensitivity: 20 mV/Pa (-34 dBV)
Max. SPL: 130 dB (for 1% THD)
Equivalent noise level (IEC 60268-4): 16 dB
Signal/noise ratio (A-weighted): 78 dB
Bass filter: switchable flat or 150 Hz, 12 dB/octave
Impedance: <600 ohms
Recommended load impedance: >=2.000 ohms
Supply voltage: 9 to 52 V phantom power to IEC 61938
Powering: <2 mA
Connector: 3-pin XLR
Finish: matte black
Net weight: 56 g (2 oz.) (without cable)