Great information and response, Jonathon!

I also have a Behringer Eurorack mx802 mixer. Its a non-powered mixer and is smaller than the Yamaha emx212s.

If I utilized the Behringer, would my connections be as follows?

Tyros 2 --- L/R 1/4" TS Instrument Cables out to channel 5/6 of the MX 802a
TC Helicon --- L/R 1/4" TS Instrument Cables out to channel 7/8 of the MX 802a
MX 802a Front Main Out L/R 1/4" TS Instrument Cables to 1/4" TS on the Bose

I also note that you say using unbalanced cables, vs. balanced. The manual for the Compacts says the following:

Connections and controls: ...#10) 1/4 input - Balanced analog input for connecting guitars and other instruments. Accepts either 1/4-inch TRS balanced or TS unbalanced cables.

Thoughts?

Thanks again for your help...