The F311 has minimal inherent noise, with excellent sound characteristics and perfect features. Ideal for supplementing mixing consoles with unsatisfactory preamps, for "on-location" recording or for "direct to tape" recordings. Phase reversal and high-pass filter are individual, the phantom power can be switched in pairs. In the F311 there are two electronically balanced XLR outputs and also RCA connectors. Mains power is supplied via an IEC/CEE socket. "We leave cheap adjustments via simple potentiometers to the competition!" The amplification is laboriously adjusted via a step switch in twelve 6 dB steps from 0 to +66 dB. It is therefore exactly reproducible and the same in both channels.