The organ in the Great Hall was built by the organ-building company Johannes Klais Orgelbau (Bonn). Development and manufacture took a total of eight years and continued even during the Philharmonie’s temporary construction stop. Since the instrument here – in contrast to other concert halls – is placed in the middle of the auditorium, the front pipes had to be protected with a special coating. The instrument has 69 stops with 4,765 pipes, 380 of which are made of wood; they are distributed over five manual movements (two swellable) and pedal. Of the 84 ranks of pipes, the first 7 stops (8′ and 4′) in the chancel movement have up to 73 pipes, i.e. 12 more notes than there are keys on the keyboards, and are extended to c5 for the superoctave couplers. The organist can play the instrument from two four-manual consoles, almost identical in appearance: one is permanently attached to the organ, the other is mobile and is positioned on the orchestra platform for playing. Four stops are housed as Fernwerk in the hall’s ceiling reflector, among them the transverse stentor clarinets; the Fernwerk can be freely coupled to each manual and to the Pedal. The Choir and Solo works can be uncoupled from the associated manuals, the Swell only at the electric console. The organ has a width and a height of about 15 metres each and a depth of about 3 metres; it weighs about 25 tonnes. The maximum wind consumption is about 180 m³ per minute. The action of the fixed console is mechanical, that of the mobile console and the stop actions are electric.