Klein + Hummel was a German manufacturer of professional audio equipment, including studio monitors, public address systems, broadcast equipment, amplifiers and high-fidelity audio components.
Founded shortly after the Second World War by Walter Hummel, Horst Klein and Heinrich Brumm, the company became one of Germany's best-known manufacturers of active studio monitors for professional recording and broadcast applications.
In 2005, the company was acquired by Sennheiser, and its studio monitor business was transferred to Georg Neumann GmbH in 2009. The company's loudspeaker designs continue under Neumann's KH series, with the "KH" designation retained in reference to Klein + Hummel.
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