beyerdynamic A 20

Headphone amplifier

  • 2x Stereo jack outputs 6.35 mm, in parallel mode
  • Frequency range: 10 - 100,000 Hz (-1dB)
  • Total harmonic distortion (THD): 0.01 % at 170 mW / 250 Ohm
  • Maximum output power: 170 mW / 250 Ohm
  • Signal-to-noise ratio: > 100 dB (unweighted)
  • Channel separation: > 80 dB at 1 kHz / 250 Ohm
  • Analog inputs: 1 Pair RCA
  • Analog outputs: 1 Pair RCA
  • Dimensions: 164 x 212 x 55 mm
  • Weight: 1640 g

Further Information

Number of stereo channels 1
Output Level Adjustment Per Channel No
Amount Of Inputs 1
Rack format No

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Powerful workhorse

iph, 06.04.2015
Super-processed headphone amplifier with sufficient output voltage for driving even headphones with high impedance. Absolutely noise-free. Sound is crystal clear and unadulterated. No artificial elevation of depths or depths. Few features; Is simply doing what he is supposed to do: to operate a maximum of two headphones at a line source. For a technically simple analog device quite expensive; I would still buy it because of the extremely high processing quality. I suspect that this is one of the rare devices that will work perfectly even after 20 years of use.
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Think of the jacket flow filter

Holger676, 28.04.2017
The device makes a very valuable impression when unpacking and turning the controller. Then the first disappointment: hum and siren, and even in variations when I move the mouse on the PC.

Reason:
- PC power supply is grounded (Schuko plug)
- A20 is grounded (also Schuko plug)
- Coupling of audio interface to A20 not symmetrical, are RCA jacks

Solution:
- Jacket flow filter. I have not found one at Thomann, so I bought the "Oehlbach 9052 Audio Linear 8" Cinch-Isolating filter / noise filter / jacket current filter.

Result:
- Perfect sound without noise
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