Lake People Phone Amp F399 D with 2x2 stereo amplifier moduls, each Module features: 2 balanced signal inputs via XLR, 1 balanced mix-input e. g. for command signals, 1 unbalanced stereo input via 1/4 phone jack, 1 unbalanced stereo output via 1/4 phone jack, 2 stereo amplifiers each with independent volume and balance control, each stereo amplifier with 2 headphone outputs on the frontpanel which may be optimized for mono signals by means of a split switch, each stereo amplifier with an additional stereo output via 1/4 phone jack on the rear panel, separate clip- and power LEDs per amplifier,