During the course of the MA 1 calibration procedure, there is a process that measures the output level feed from the audio interface outputs into the KH monitors.  If you receive an error message stating a difference in levels, start here:

1. On the backplates of your monitors, ensure all DSP-capable monitors are in Network Mode and that all Input Gain and Output Volume switches match.

If your speakers have an Input Select switch, these should also be set appropriately.

2.  In MA 1 on the Audio interface setup page that precedes the Output Level window , confirm the Starting output channels are the correct output pair connected to your monitors:

3.  Some interfaces may include a software mixer - examples include RME's Totalmix, Focusrite Control, Universal Audio Console, and MOTU's Cuemix.

With these, ensure signal is getting routed to the appropriate output pair selected in MA 1.  During the Output Level Signal Adaptation test, you should see metering in its UI.

If using an MT 48, ensure DAW1 is enabled in Menu > Settings > USB IO.

4. Lastly, try slowly increasing the output or monitor level on your interface and retrying the Output Signal Level Adaptation process again.