Teac UD-503-S Dual-Monaural USB DAC with Headphone Amplifier Silver USB DAC that supports 11.2MHz DSD and 384kHz/32-bit PCM Dual-monaural circuit structure used from the power supply to the digital and analog sections Both left and right channels have their own high-end AK4490 DACs, which are made by Asahi Kasei Micro devices Corporation Two high-capacity toroidal core power transformers-one each for left and right channels Four types of PCM digital filter and two types of DSD filter