Just hire a tiny PA system for the duration of the installation. Maybe just a pair of active monitors would sort you out depending on the size of the installation and the distances at which you need people to hear it, ie people standing close or far away. Inverse square rule I think for wattages.
Google your local disco shops and go chat to them. Like in bike shops they really like talking about their stuff.
Just hire a tiny PA system for the duration of the installation. Maybe just a pair of active monitors would sort you out depending on the size of the installation and the distances at which you need people to hear it, ie people standing close or far away. Inverse square rule I think for wattages.
Google your local disco shops and go chat to them. Like in bike shops they really like talking about their stuff.