Truesonic TS3 from Alto Professional: Expectations Exceeded. The new Alto Professional Truesonic TS3 Series does everything you demand in a no-compromise family of professional loudspeakers. These speakers solve every performance and installation challenge you have. They are high-performance in every sense: Their new transducers and amplifiers enable them to play extremely loud and clear, without compromise or restriction. And they are “high-performance” from a concept and manufacturing standpoint—we made sure that every aspect of their design outperformed what it had to do. The end result are loudspeakers that achieve a level of excellence and refinement that defies expectations. Defies your expectations.