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Snohetta Oslo Opera House Interior Opera Huose

The main auditorium

The main auditorium is a classic horseshoe theatre built for opera and ballet. It houses approx. 1370 visitors divided between stalls, perterre, and three balconies. Technical spaces occupies the area above balcony 3.
The orchestra pit is highly flexible and can be adjusted in height and area with the use of three separate lifts.
On each side of the stage are mobile towers which allow for adjustments in the proscenium width for ballet or opera without damaging the acoustics of the hall. Reverberation time is fine tuned using drapes along the rear walls and control rooms for sound and light are located to the back of the hall.
The form of the auditorium is based on several relationships: short distance between the audience and the performers, good sight lines, and, above all, excellent acoustics. The architectural intentions for a modern auditorium with traditional, acoustic musical performance have been developed in parallel with requirements for visual intimacy and acoustic excellence. In older opera halls acoustic attenuation was often achieved by using rich decorative, sculptural elements on most surfaces. In this case the requirements have been met with a clean, carved aesthetic using a modern formalistic language.
The requirement for a long reverberation time results in a room with a large volume. In this case the volume is increased by the use of a technical gallery which cantilevers out over the walls below, giving the hall a T shaped section. The main structure of the stone clad roof above is included in the volume of the hall rather than being hidden behind a false ceiling.

Optimum acoustics have been achieved by the following methods:
• We have, also as an aesthetic move, given the balcony fronts a geometry which changes relative to its location in the room and the acoustic function necessary in each location. At the sides the form reflects sound back down to the audience whilst at the rear it sends soungs in multiple direction to avoid focussing.
• The oval ceiling reflector visually finishes the hall and also reflects sounds in very specific ways. The same principle is used as with the balcony fronts.
• The rear walls at each level are made up of convex panels to avoid focussing and to spread sound evenly through the room.
• The geometri of the interlying walls, main orchestra reflector, and the mobile towers are modulated to scatter sound around the space. Using timber staves of varying dimensions to modulate sound of different wavelengths.
• All the surfaces are of relatively dense materials to avoid high frequency vibrations. Balcony fronts are 50mm solid oak where the rear wall panels are 100mm MDF with oak veneer.

The double curvature of the balcony fronts and oval ceiling ring are made of pre-fabrcated oak elements made of solid stave glued together, amonia treated and the routed from 3D computer drawings before oiling and polishing. The dark coluour is particularly suited to the theatre space and the oak gives a rich, warm, and intimate feel to the space.
The seats are designed to absorb as little sound as possible. Materials are dark timber and a specially design orange red fabric as a counterpoint. Text display screens are built into the seat backs so that the audience can individually choose to read the libretto in a number of languages.
The auditorium is illuminated by a snøhetta designed chandelier in the form of a shallow lens as well as inbuilt LED fittings in the cailigs and floor.

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