If you want the perfect power amplifier for pair of Club S115s with a 500-watt program rating, for example, the P5000S with 500-watts per channel into 8 ohms is the obvious choice.Further matching precision is afforded by Yamaha's proprietary YS Processing circuit. Each P-S Series amplifier is equipped with this specially designed circuit so that it delivers output tailored to the specific response of the Club Series speakers. All models feature both XLR and 1/4-inch TRS inputs, and Neutrik Speakon, phone plug, and 5-way binding post outputs. Other features include Yamaha's exclusive EEEngine technology for high performance with exceptional efficiency, sweepable high and low pass filters for matching output to any loudspeakers, a compact and durable 2U chassis, and variable speed cooling fans.