Hybrid Tube Design (6922) 6.5V Output at 2.0V Input. (Shared with the Pre-Out Stage) Suitable for All Electro-dynamic Headphones Frequency Response: DC 100 kHz +/- 0.1dB Voltage Gain: 10dB Maximum Output Voltage: 7Vrms Output Impedance. Digital to Analog Converter (DAC). 5 Digital Inputs: 1 USB, 2 Coax, 2 Optical ESS 9006 DAC 24/96 Up sampling 11 Regulated Power Supplies Organic Capacitors Class A Output Stage Transformer-Coupled Digital Inputs Galvanically Isolated USB Stage >122db S/N.