Maybe for smaller venues you could use Advent Powered Partner speakers. I think the 550 model is rated at 35watts per channel. You can daisy chain these powered speakers. From my experience, you can't turn them up all the way without distortion, but they can get pretty loud. They weigh 8lbs apiece. Maybe they could fit on your Tyros' speaker brackets.

I use a headset mic which is right on my lips, so I have never had feedback. But I will try putting the Motion Sound KP-100S amp in front of me when I get it.

Beakybird
Beakybird