Resonators are a small but fascinating field of electroacoustics. They reproduce sound through transducers that are played into them, giving the sound their unique character. This allows a bassline to sound like it’s coming from a string instrument or harmonics to be added via strings attached to the resonator.
Pyramid by La Voix du Luthier is a hybrid of speakerbox and resonator that transfers the character of playing an acoustic instrument to electronic ones.