AK4499EX. AK4499EX DAC and AK4191 modulator, the flagship products from Asahi Kasei Microdevices. With independent power supply and groundingfor each channel, separate digital-analog architectureeliminates interferences from the source.. Exclusive technology over FPGA. Signal routingClock management. PLL. DOP decoding. PCM/DSD silent switch.. Network streamer. Roon Bridge/UPnP/HOPlaye.. Headphone amplifier. Balanced & single-end. 2 gains. Independent switches for headphone & Line-out.. Rigorous design, reasonable layout, high-grade quality and solid materials.