The HA540 MK2 no headphone amp has impressed us more than the Bellari HA540. It is a lush sounding 12AX7 tube headphone amp running 150 regulated volts to the tube plates. With plenty of gain that is uniquely capable of driving headphones rated from 8-2000Ohms. Having two separate inputs, it’s brilliantly designed to work equally well with different source components. It will produce superb clarity when connected directly to a CD player, computer, phone or DAC. A zero-feedback design guarantees a smooth natural analog response. It will be the thing that kicks your music up a notch, and gets you addicted to this hobby. There is a definite weight to the audio quality, in the sense that everything felt like it had some genuine power driving it.