For three years I have nothing to say what model it works properly it is for emergency amp speakers 300w rms

Negative: missing Speakon outputs for the speakers I put myself in the same
(But the model is a little dated now it's normal)
power display by yamaha seems a bit exaggerated but ... 8 ohms
lack handles transportation damage
significant depth (as wide as deep) to choose the right rack!

positive power to weight ratio 450w into 8 ohms for the month of 15 kg on 2 units in height
knob large volume diameter and recessed
to boost bass speakers yamaha

value for price interresting see argus http://www.sonomag.com/