O500C

About the O500C

The Klein + Hummel O500C is a professional active main monitor designed for studio use, featuring a tri-amplified 3-way system with a 12" woofer, 3" midrange dome, and 1" tweeter. It incorporates an integrated digital controller with advanced FIR (Finite Impulse Response) filter technology for superior sound quality and precise frequency response control. The woofer uses a patented rear-ventilated voice coil design with an aluminum die-cast basket, providing high power handling, low distortion, and excellent linear excursion. The monitor delivers a frequency response from 27 Hz to 20 kHz and a maximum SPL of approximately 123.4 dB. Amplifier power ratings are approximately 400 W continuous for the woofer, 230 W for the midrange, and 290 W for the tweeter, with dynamic peaks higher. The system includes analog and digital inputs and is magnetically shielded. It offers flexible room adaptation controls for three critical frequency bands. The O500C was highly regarded for its dynamic range, low distortion, and detailed midrange dome driver, which was based on an ATC design. Production ceased roughly 10 years ago, making it a discontinued model. It was often paired with the O900 subwoofer for extended low-frequency performance.