1 SpAudio brand Transducer A component designed to produce full-fidelity sound in a variety of climates and environments. This item is part, not a complete audio system. Specifications: The transducer is mounted into a tunnel located on each side of various Hot Spring spa models. This tunnel provides the transducer this ability to set flush against the backside of the spa shell. The design makes for optimum transference of vibrations through the water enabling the bather to feel every musical note