I have the EUROPOWER PMP4000 (sn: N1005776A8N Date Code: 1007). I am trying to connect mains and monitors using the MON 1 / MONO setting to 2 Behringer B1520 PRO (SN: S1102901286 and S1102902286 Date Code: 11 07) main speakers using 2 conductor Speakon to Speakon (output B) daisy chained and 2 various monitors using 2 conductor Speakon to 1/4" (output A) daisy chained. When I do this I get no sound out of the mains, but the monitors produce sound. My cables are 2 conductor. I can reverse the cables running the Speakon to Speakon mains from output A and the monitors using Speakon to 1/4" in output B and everything works, but I have to adjust the mains using the monitor controls and the monitors with the channel sliders.
What am I doing wrong?