The KM 140 is a historical miniature condenser microphone from Neumann's KM 100 series, combining the KM 100 output stage with the cardioid AK 40 capsule. It features transformerless circuitry for low self-noise and high output capability, with a frequency range of 20 Hz to 20 kHz. Measuring 92 mm in length and 22 mm in diameter, it operates via 48V phantom power (P48) and delivers a maximum SPL of 138 dB (148 dB with preattenuation). Its pressure-gradient transducer design ensures smooth frequency response within ±135° pickup angle, making it suitable for applications requiring minimal visual presence, such as film/video production, stage use, or ceiling-mounted concert hall recordings.