2-way bass-reflex high power loudspeaker system provides dual phone jacks as well as dual Speakon connectors for input and parallel connection. A high-performance PA system can conveniently be created simply by connecting a pair of speakers to an EMX series powered mixer using phone jack outputs on a box-type model, or the Speakon connectors on console model. When used in conjunction with P series power amplifiers and an MG series mixing console, flexibility to add monitor speakers and subwoofer to create versatile live sound system. YS processing (Yamaha speaker processing) switch provided on EMX series powered mixers and P series amplifiers enhances performance with single-woofer models (S112V, S115V, C112V(A), C115V(A), and monitor models) for even greater sonic impact. Concert club series is provided with protection circuit that prevents excessive tweeter input due to acoustic feedback or other causes.