Yamaha makes very good mass market audio gear and the electronic on a Yamaha StagePas 300 are solid and have very good output. The electronics have a 20Hz-20kHz frequency response with reasonable specs; the speakers are rated at 55Hz-20kHz and if you use good quality microphones and cables this is probably what you get in terms of audible response. There's very little audible distortion at moderate volume levels and little hum or other noise--a very smooth and natural sounding output. There are limited hi and lo EQ abilities on all the input channels.
