Bionor

About the Bionor

The Siemens Bionor is a classic horn-loaded cinema speaker system manufactured by Klangfilm under Siemens in Germany around 1957. It features a two-way design with a horn-loaded midrange and tweeter unit combined with horn-loaded cone woofers. The system uses two KL-L405 woofers mounted in a large front horn and a KL-L302 compression driver/tweeter horn flush-mounted at the top. The crossover is a 15 ohm KL LZ 303 unit splitting drivers at 500 Hz. The speaker has an enormous wooden baffle measuring approximately 2500 x 1850 x 1000 mm (WHD), made from seasoned pine wood with merbau veneer fronts in some replicas. The Bionor is renowned for its ability to play loud and clean, especially in the 100–400 Hz range, with a huge soundstage centered on a homogeneous midband and very little horn coloration in the upper octaves. It is considered one of the greatest speakers of all time for its stupendous dynamics, tactile voicing, and true timbre reproduction of real instruments. Due to its size and rarity, it is extremely difficult to find or own one today. The system was originally intended for cinema use and is highly regarded by audiophiles for its unique sound character and historical significance.