If you also hear what you see, the external analog amplifier has a nasty background hum, the headphones are much too quiet, and the sound comes across much too flat and powerless in other ways as well, then something is obviously rotten with the system. But where is the best place to start and, above all, what are the causes? I have already [...]
Fosi Audio K7 DAC and Headphone Amp Review- Audiophile Gaming and a detailed technical Analysis with depth
