With a high-gain RCA input, the A 20 works easily with most sources. The input signal can be looped through and is entirely free from signal loss thanks to the hard-wired RCA output. The A 20 guarantees an especially open and transparent sound with any headphones, no matter if having a low or a high impedance.

Also in terms of flexibility, the A 20 leaves nothing to be desired: the knob made of solid aluminium is equipped with an original ALPS potentiometer for variable volume control. On top of that, the A 20 features dual headphone jacks on the front.