Two channels include XLR mic inputs. This allows you to blend the relative levels of stereo inputs to your liking. In addition, each channel includes a switch for +4 dBu or -10 dBV line level input. For output, the SM10 provides electronically balanced main stereo XLR and 1/4-inch line outputs. The SM10 provides versatile signal routing via Main Mix, Mix B, Monitor and EFX bus outputs, as well as low noise and discrete microphone pre-amplifiers with 48-volt phantom power.