RDL FP-MX4 4 Mic or Line Input Mixer - Mic and Line OutThe FP MX4 is a single channel audio mixing module featuring four identical inputs. Each input accepts either a mic or line level source. The output section provides four mixing potentiometers corresponding to the four inputs. The output section provides both a balanced line (+4 dBu) and balanced microphone level ( 45 dBu) output. Both outputs may be used at the same time. The four mixing potentiometers are intended to be set at installation or to be