Walk into a gallery where Janet Cardiff's The Forty Part Motet is showing and the first thing you notice is not the music. It is the furniture: forty black loudspeakers on stands, arranged in a wide oval around a few benches.
Then the voices start. Each speaker carries one singer from a choir performing Thomas Tallis's Spem in alium, and the room becomes something you can walk through. Lean towards one speaker and you hear a single bass clearing his throat. Step back to the middle and the whole choir rises around you.
That shift, from listening to a recording to moving through one, is what an audio art installation does well. This guide looks at how these works are built, what makes them different from a concert or an album, and how to experience one properly.
What makes a sound installation different from music
A piece of music usually asks you to sit still and follow it from start to finish. A sound installation usually works the other way round. The sound stays put, often looping or running continuously, and you decide where to stand and how long to stay.
That makes space part of the material. The size of the room, the hardness of the walls, where the speakers point and where people are allowed to walk all change what you hear. Two visitors in the same installation can come away with quite different experiences.
Many artists in this field describe their work as sculpture made of sound rather than as composition. If you want the longer history of that idea, our piece on sounding sculpture follows artists who turned physical objects into instruments.
The Forty Part Motet: a choir you can walk through
Cardiff made The Forty Part Motet in 2001. She recorded each of the forty singers separately, then gave each voice its own speaker, grouped into eight clusters of five, matching the eight five-part choirs Tallis wrote for.
In a concert hall, you hear those voices blended from a fixed seat. In the installation, you can stand beside one singer, cross the room to another, or sit in the centre where the blend is closest to a performance. The piece has been shown widely, and versions are held by collections including the National Gallery of Canada in Ottawa.
The work is a useful model because it is so simple. There are no screens and no interactive sensors, just careful recording, careful placement and a room people can move through. Everything else comes from the listener's body.
Sound installations in public space
Not every audio art installation lives in a gallery. Some of the best-known ones are hidden in plain sight.
Max Neuhaus installed Times Square in New York in 1977. Beneath a subway ventilation grate on a pedestrian island between Broadway and Seventh Avenue, between 45th and 46th Streets, a loudspeaker sends up a steady, resonant drone. There is no sign. Most passers-by never notice, while others stop, puzzled, on the grate.
The piece was switched off in 1992 and reinstalled in 2002, and it is now maintained by the Dia Art Foundation. It shows how little an installation needs to announce itself. The city supplies the frame and the audience.
The British-born artist Bill Fontana works in a similar spirit, using microphones and vibration sensors to relay the hidden sounds of structures. For Harmonic Bridge in 2006, he fed the vibrations of London's Millennium Bridge into the Turbine Hall at Tate Modern, so visitors heard the bridge humming under footsteps and wind.
Interactive sound installations
Some installations only come alive when you take part. The German sound artist Christina Kubisch began working with electromagnetic induction in the early 1980s, building pieces that could only be heard through special headphones.
In 2003 she started her Electrical Walks. Visitors borrow headphones that pick up the electromagnetic fields around them, then walk a route through a city. Cash machines, shop security gates, lighting systems and transit networks turn out to be full of buzzing, clicking and pulsing signals that are normally inaudible.
The walks are interactive in the most direct way: what you hear depends on where you go. No two routes sound alike, and the city becomes the score. If you are interested in why audiences behave the way they do inside works like this, our piece on interactive installations and audience participation looks at the psychology behind it.
When sound and image share the room
Audio visual art installations combine sound with light, projection or moving objects, and the two are usually composed together rather than one illustrating the other.
The Japanese artist Ryoji Ikeda is a well-known example. His large-scale works pair dense electronic sound with black-and-white projections of data, timed so precisely that image and audio feel like one signal. In 2011 he filled the drill hall of New York's Park Avenue Armory with the transfinite, a field of projected data that visitors could walk across.
A quieter approach comes from the Swiss artist Zimoun, who builds installations from cardboard boxes, wooden slats, wire and hundreds of small DC motors. Each motor taps or scrapes a material, and the combined sound is a soft, shifting rattle that you see and hear at once. There are no loudspeakers at all; the mechanism is the instrument.
For more on artists who treat sound and picture as a single medium, see our guide to audio visual art.
How audio art installations are built
Behind most installations sits a set of practical decisions that shape the experience as much as the sound itself.
Speakers and channels. A stereo pair gives a fixed image, while multichannel setups, from eight speakers up to dozens, let sound move around the room or sit in distinct places. Cardiff's forty separate channels are an extreme but clear example.
Headphones versus open air. Headphones give each visitor a private, precise mix and make it possible to work in noisy places, as Kubisch does. Open speakers let people share a space and hear the room's own acoustics.
Looping and duration. Most installations run on a loop, so length matters. The Forty Part Motet, for instance, combines the motet with a recorded interval in which you hear the singers talking and warming up, before it starts again.
The room itself. Reverberation, background noise, flooring and even ventilation affect what visitors hear. Artists often adjust levels and speaker angles on site, and many works come with detailed installation instructions so they can be rebuilt elsewhere.
How to experience a sound installation
A few habits help you get more out of these works.
Give it time. Many installations reward staying for a full loop, and some change so slowly that the first minute tells you very little.
Move around. Walk the edges, stand in the middle, get close to a speaker and then step away. Position is often the main thing the artist is offering you.
Notice the room. Listen for how the sound bounces off walls, how other visitors' footsteps blend in, and what happens when the space goes briefly quiet.
Read the wall text after, not before. Coming in without expectations often makes it easier to hear what is actually there.
Why audio art installation matters
Audio art installations ask for a kind of attention that most media do not. They slow you down, make you aware of your own position and remind you that every space already has a sound of its own.
They also show how much can be done with little. A drone under a grate, a ring of speakers or a pair of headphones can change how a familiar place feels.
If one artist's approach makes a good starting point, it is the use of a single human voice in space. Our profile of Susan Philipsz shows how far that idea can be taken.
About Dr. Mira Solheim
Dr. Mira Solheim is an art historian and writer focused on artistic research, Nordic visual culture and the intersection of art with technology and film. She writes for Artistic-Research.no on methodology, institutions and practice.