Topping D3 USB&Optical&Coaxial&BNC DAC silver D3 can input RCA coaxial, BNC coaxial, fiber optic signal, supports a wide 16bit-24bit, 32kHz-192kHz D3 can connect the computer to become a good external USB sound card, USB supported range of up to 24bit/96kHz, through the drive can support ASIO D3 also take into account the AUX input, can be used as pure amp or preamp to use,CS8416 + CS4398 + OPA2134 full HIFI devices finely tuned to get the perfect sound Amp output voltage swing of up to 19.2 volts, easily drive 600 ohm impedance headphones D3 with CNC precision machining aluminum shell and solid aluminum knobs, texture, feel better