Maby I'm not understanding this application. Will you be running the Tyros directly into a non powered mixer and then to your speakers? I wouldn't think that the Tyros would have enough power to drive the speakers without an external power source. I would think that you may have an impedance problem if you come from an external speaker jack on the guitar amp, throught the mixer and then to the speakers. If you come out of the line out of the guitar amp, you would also need an external power source.


Russ