Acoustical Society of America
Professional audio

Auditorium sound

An auditorium system is judged in the worst seat, not the best. Coverage, intelligibility and the room's own acoustics decide it long before the equipment list does.

Auditorium from the rear, with raked seating either side of a timber aisle, a lit stage, a truss and a glazed roof
SD Bihani Auditorium — Raked seating · stage truss

Related

The test of an auditorium is whether a speaker can be understood without effort from the back row, and whether music arrives with the same balance in the gallery as in the stalls. Both are settled by the room's reverberation and by where the loudspeakers can physically go.

Wide hall with a red stage curtain, a lighting bar and loudspeakers over the stage, green fabric walls and a timber floor
SD Bihani AuditoriumStage · lighting bar
School hall full of children in green seats watching a projected image, with loudspeakers flanking the stage
Nosegay SchoolSchool hall · in use
School hall with a projection screen over the stage, fabric-panelled walls with lit recesses and wall-mounted loudspeakers
Saraswati Siksha SadanSchool hall · screen and speakers

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What the design covers

  • Reverberation brought to a target appropriate to speech, music or both.
  • Loudspeaker positions modelled against the seating geometry, including balconies and under-balcony seats.
  • Delay and fill loudspeakers where a single source cannot reach.
  • Stage monitoring, and provision for touring equipment to plug in.
  • Microphone systems for lectern, stage and roving use.

Control and operation

Halls are run by whoever is available on the night. We set the system up so normal use needs a few clearly labelled controls, keep the full processing accessible for engineers, and train the venue's staff on handover.

Commissioning

Coverage, intelligibility and response are measured in the seats once the room is finished, and the report goes to the client with the handover.

Tell us the room

Send dimensions and intended use. You get back an indicative acoustic treatment, a systems outline and a budget range.