SMSL SMSL Q5 black 50W Pure Digital Power Amplifier USB/Coaxial/Optical with Remote Control (Black) pure digital amplification technology, including audio mode optical fiber, coaxial, computer USB, analog input. Adopt ST's high-quality digital amplifier series - digital power amplifier STA350BW and dedicated chip for digital modulation technology products. FFX technology to ensure high quality, low power consumption. The 'Easy Start' patented technology allows precise control of the power supply circuit to improve the sound system reliability. meets high-definition Blu-ray and HD-DVD format for demanding audio interface standard with sampling rate 44.1-192K own testing.