tuning basics

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Harmonic Bridge, O+A since 1998 ...
Traffic passing on Highway 2 overpass activates harmonic series in two 16 foot "C" tuning tubes afixed to the bridge. The resulting harmonic stereo field is installed in the reclaimed gothic acoustic space beneath, emanating from two "Cube" loudspeakers designed by O+A.
This permanent installation has been running since 1998, placing the city of North Adams in the key of "C" for nearly three years running.

Tube mounted on handrail. Different views of cubes under bridge.

Pictures from the Opening Event (taken from a video).

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Harmonic Bridge seen from the side.