The P-Series amplifiers deliver pro-quality power in a wide range of configurations, and are perfect for mating with the popular Club Series speakers, as each model's power signal is tuned via YS processing to the needs of Club Series speakers. All models feature both XLR and 1/4" TRS inputs, Neutrik Speakon, phone plug, and 5-way binding post outputs. Other features on the Yamaha P3500S Dual Channel Power Amp include sweepable high- and low-pass filters, Yamaha's exclusive EEEngine technology for high performance with exceptional efficiency, and a variable speed fan. Rackmountable 2U chassis. Delivers 450W/Ch. @ 4 ohms, 350W @ 8 ohms, and 900W @ 8 ohms bridged.