I hope to try them this afternoon. I have used both sets both with and without mixer. I can't tell any difference in quality or clarity. The Tyros has an excellent internal mixer, so when I use an external mixer, I set it almost completely flat anyway.
I HAVE found that using balanced cables between the mixer and amps seems to make them sound better. I can't describe the difference. Maybe it is perceived. I discussed this with Tony Barbetta at length, and he said that he observed the same thing.
The Barbettas have 1/4-inch inputs that are either unbalanced or balanced depending upon whether you use standard cables or balanced (trs) cables. Of course the output from the mixer must be balanced also.
DonM