Hi, angeljohng,
So what would be the correct way to connect.. From the Kemper to my FRFR speaker and from the FRFR to FOH (mono)?.. or stereo from Kemper to FOH and monitor out to my FRFR speaker
Check out this chapter in the Kemper Manual.
The Sound of Guitar Cabinets versus Mic'ed Speakers
Kemper Manuals and Quick Start guides
After reading that chapter, you'll have a better understanding of why we have separate outputs for monitors and mains on the Kemper Profiler.
Main Outputs to Front of House (FOH)
Typically, you use the Main Outputs for the FOH, and we have to assume the FOH system is Full Range, Flat Response (FRFR) and tuned to suit the venue. That can be stereo or mono, but typically FOH is run mono.
Monitor Outputs - a subjective choice
You can do whatever you want for the monitor outputs (to be heard by you and people on stage with you).
- FRFR if you want to hear the same signal you are sending to the FOH (and roughly what the audience hears)
- Run the monitors FRFR stereo if that's what moves you - even if you run mono to the FOH
- Run powered cab or Kemper Kabinet if you want the amp-in-the-room sound
The correct way is whatever it takes to support you as you put on a great show for the audience.