The circuit of the A20 is designed based on our legendary A 1 reference headphone amplifier. The discrete output stage provides plenty of power even for high-impedance headphones while the dynamic, open and precise sound sets the A 20 apart from what can be found in the normal output stages of regular amplifiers or receivers. This is confirmed by its first-class circuitry and excellent technical specifications that provide a balanced sound for long periods of comfortable listening.
Made of brushed aluminum, the housing of the A 20 is especially solid and resonance-free. Due to the innovative chassis design, no screws are visible on the external surfaces. Equipped with an original ALPS potentiometer for variable volume control, a knob turned from solid aluminum completes the attractive yet robust look of this amplifier.
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. Due to the built-in power supply, which is connected via a detachable power cord (supplied), no external power supply is needed avoiding disturbing background noise. Thanks to the dual headphone jacks on the front, two people can listen to the A 20 together without an adapter cable.
|Dimensions||164 x 212 x 55 mm|
|Frequency range||10 Hz - 100 kHz (-1 dB)|
|T.H.D.||0.01 % at 170 mW / 250 Ω|
|Maximum output power||170 mW / 250 Ω|
|Unweighted signal-to-noise ratio||> 100 dB (unweighted)|
|Channel separation||> 80 dB at 1 kHz / 250 Ω|
|Headphone outputs||2 stereo jack outputs 6.35 mm (1/4") in parallel mode|
|Analog inputs||1 pair RCA|
|Analog outputs||1 pair RCA|
|Net weight without packaging||1640 g