The PX series, which incorporates the latest technology and know-how, is a high-quality power amplifier with high output performance and excellent signal processing capabilities. In addition, flexible processing by combining a high-performance DSP with Yamaha's know-how in signal processing technology provides maximum power to your speakers while protecting them with simple operations, such as a Config Wizard that provides optimal settings for your speakers and presets for optimal tuning for Yamaha speakers.
Hook up was straightforward, can use balanced XLR or unbalanced RCA quarter-inch hookups. And has adjustable high-pass low-pass filters settings. Can be configured with multiple settings which can be saved allowing speakers to be set up for different playback situations. Shows digital volume levels on display screen allowing you to set left and right channels equally without having to listen to output. Has many features that I probably will never use but is very flexible and multiple units can be used together to control different sets of speakers. His rack mountable and takes up two spaces. Only drawback it has two 80 mm fans which do produce some noise. But if you have the volume above 50 dB you probably won't ever hear the fans.