Headphone Amplifier Beyerdynamic A20


eyerdynamic A20 Review. The Beyerdynamic A20 is a small desktop headphone amp with dual 1/4″ outputs and comfortably handles 600ohm headphones.


With the A 20 you will rediscover your dynamic headphones.

This new headphone amplifier from beyerdynamic is perfect for all headphone applications and provides dual outputs for shared listening with a partner.


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.

  • Two 6.35 mm headphone outputs
  • Elegant and solid all-metal housing
  • Particularly open, transparent sound
  • Also suitable for 600 Ohms headphones

Specifications :

  • Input Impedance: 25 Ω
  • Maximum Amplification: 18 dB
  • Frequency Response: 10 Hz – 100 kHz (-1 dB)
  • T.H.D.: 0.01% at 170 mW / 250 Ω
  • Channel Separation: > 80 dB at 1 kHz / 250 Ω
  • Output Power: 100 mW / 600 Ω, 150 mW / 30 Ω, 170 mW / 250 Ω
  • Maximum Output Power: 170 mW / 250 Ω
  • Signal-to-Noise Ratio: > 100 dB (unweighted)
  • Output Impedance: Headphone Output 100 Ω
  • Input Voltage: 100 V ~ 240 V AC; 50/60 Hz
  • Power Consumption: < 10 W via integrated switching power supply
  • Audio Connections: 2 x 1/4″ (6.35 mm) stereo output jacks; 1 x RCA (L/R) line output; 1 x RCA (L/R) audio input
  • Housing Only: 164 mm x 194 mm x 48 mm
  • Housing, including button, rubber feet, RCA phono sockets: 164 mm x 212 mm x 55 mm
  • Net weight (without packaging): 1640 g


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