Solutions for state-of-the-art acoustics

A simple material palette of concrete, glass, steel and oak achieves both aesthetic and functional goals. The poured-in-place concrete structure serves as both the exterior and primary interior finish. Oak panels, located only where acoustically needed, add warmth to the interior, serving as an aesthetic counterpoint to the exposed concrete finish. Above the audience chamber, curved acoustic reflectors made from solid white oak are suspended from the technical catwalk system. Custom 60-foot wool serge banners can be lowered from above to adjust for amplified sound, and the articulated board-form concrete walls in the audience chamber diffuse and blend the sound while creating a unique aesthetic within the space. With a series of reflectors and a highly adjustable range of reverberation time from 1.2 seconds to 2.5 seconds, the acoustic solutions give the hall an exceptional degree of flexibility.

Noise and vibration was a particular concern as this building is subject to the hustle and bustle of an active urban setting, vehicular sounds from the parking garage directly below, and the roar of planes passing overhead en route to Love Field Airport. Concrete framing was used in a number of different ways to meet acoustic requirements. All floor areas within the hall, including the seating area, stage and orchestra pit, were fitted with a floating concrete slab over an acoustic isolation mat. This system was installed directly on the parking structure “roof” slab, and exists as a walking surface in the crawl space under the stage and seating area, and the finish floor surface at the orchestra pit. The seating area slab is 10 inches thick, supported on interior concrete columns (stub columns bearing on the parking structure below) and the perimeter load bearing walls. To isolate this slab from structure-borne noise and vibration, it is fully supported on 3-inch thick rubber bearing pads at all bearing locations (interior columns and perimeter walls). Corridors and ancillary spaces around the perimeter of the hall are constructed with concrete topping slabs over acoustic underlayment.

Sound management is achieved partially through the use of articulated board-formed concrete walls. The rear and side walls of the hall, all architecturally exposed concrete, are formed with rough sawn lumber to give the formed surface a distinctive, board-formed appearance. Each form board was strategically located with variable dimensions to give the wall an undulating, acoustically roughened surface to disperse the sound.

The balcony is structured to allow acoustical banners to be lowered from the ceiling, through large slots along the edge of the balcony, to the floor below. As a result, the balcony structure is supported by relatively few beams cantilevering from the perimeter wall, making it appear to “float” within the space.