Beyerdynamic A 20 (A20) Like New

Professional Grade Brushed Aluminum Desktop Headphone Amplifier with Dual Front 1/4" Headphone Jacks

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A 20 Premium Headphone Amplifier

The Beyerdynamic A20 Headphone Amplifier Offers an Incredible Listening Experience

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 Beyerdynamic A20 Headphone Amplifier Offers an Incredible Listening Experience

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.


The Beyerdynamic A20 Headphone Amplifier Offers an Incredible Listening Experience

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.


The Beyerdynamic A20 Headphone Amplifier Offers an Incredible Listening Experience

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.

General Features:

  • Like new
  • Used for product images and review
  • Beyerdynamic A20 Premium Headphone Desktop Amplifier
  • Dual 1/4 Inch headphone jacks on the front allows two people to listen without an adapter cable
  • RCA input can be easily daisy-chained without loss to run a second Amp for twice the power
  • High gain RCA input works easily with most sources
  • Built-in wide-range switched-mode power supply for improved power use and a steady output
  • Brushed aluminum, all-metal housing with no visible screws makes this a beautiful sleek looking desktop Amplifier as impressive to look at as it sounds
  • The wide frequency range (10 Hz - 100 kHz) and high max power output (170 mW, 250 Ohms) provide a dynamic, open and precise sound
  • Provides a sufficient amount of power for most any high-impedance audiophile headphones on the market
  • Equipped with original ALPS potentiometer for variable volume control
  • Designed for use with headphones with an impedance rating of 30 - 600 Ohms
  • Recommended Premium Stereo Headphones: Beyerdynamic T90 and Beyerdynamic T70
  • Primary Color Tone: Brushed Aluminum
  • Manufacturer Part Number: Beyerdynamic 716014
  • Also Found As: Beyerdynamic A20 (716014)
  • Authorized Beyerdynamic Retailer
  • 2 Year Manufacturer's Warranty

Technical Features

  • Audio Connections: 2 headphone sockets, 1/4" stereo jack, 1 line output and 1 audio input via RCA phono sockets
  • Output Power:
    • 100 mW at 600 Ohms
    • 170 mW at 250 Ohms
    • 150 mW at 30 Ohms
  • Input Impedance: 25 kOhms
  • Maximum Amplification: 18 dB
  • Frequency Response: 10 - 100,000 Hz
  • Total Harmonic Distortion: 0.01% @ 170 mW / 250 Ohms
  • Channel Separation: >80 dB at 1kHz / 250 ohms
  • Signal-to-Noise Ratio: >100 dB (unweighted)
  • Output Impedance: Headphone Output 100 ohms
  • Input Voltage: 100-240V AC / 50/60Hz
  • Power Consumption: <10 W via integrated switching power supply
  • Ambient Temperature: +10 degrees Celsius to +40 degrees Celsius
  • Humidity: < 90%
  • Approximate Product Dimensions (Unit Only): 6.46" x 7.64" x 1.89 Inches (164 mm x 194 mm x 48 mm)
  • Approximate Product Dimensions (Including Connections & Rubber Feet): 6.46" x 8.35" x 2.17 Inches (164 mm x 212 m x 55 mm)
  • Approximate Weight: 3.62 Pounds (1640 Grams)

What's in the Box?

  • A 20 Headphone Amplifier
  • 10A 125V Wall Plug
  • 10A 250V Wall Plug
  • Safety Information Pamphlet
  • Operating Instructions
  • 2-Year Authorized Warranty Information

Product History:

Beyerdynamic A 20 thumbnail
(newest, current model)
Beyerdynamic A1 thumbnail
(previous model, replaced by Beyerdynamic A 20 (A20) Like New)

Headphone Amplifier Specifications

Amplifier Style
Some headphone amplifiers are designed to be portable and others are meant to be placed on a desk. This will tell you what style of amplifier this item is.
Digital-to-Analog Converter (DAC)
A Digital-to-Analog converter (also known as a DAC) converts a digital audio signal into an analog signal. This is especially helpful for listen to music from digital sources, such as iPods and smart phones.
Frequency Response
The range of frequencies the amplifier will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
10 - 100,000 Hz
Input Connection
This is the manner in which the headphone amplifiers receive an input audio signal.
Stereo RCA
Input Impedance
This is the input impedance of the headphone amplifier.
25,000 ohms
Output Connection
This is the manner in which the headphone amplifier will output the audio signal.
1/4" Plug
Number of Outputs
Some headphone amplifiers have a built-in splitter so multiple pairs of headphones can be connected to it. The number specified here is the number of headphones that can be connected to the amplifier.
Output Power
This is the output wattage of the headphone amplifier. It is measured in mW.
100mW @ 600 ohms mW
Output Impedance
This is the output impedance of the headphone amplifier.
100 ohms
The width of the item from left to right (side-to-side) measured in inches.
The height of the item, measured from top to bottom, in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

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Average Attribution Rating

Browse 1 question and 2 answers
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Why did you choose this?
Sonic Electronix Store
great price @fast service
Roger L on Dec 18, 2016
Companion product to my Beyerdynamic DT 1770 headset. Can't wait to try it out
Blues_Viking on Mar 13, 2016

Product Summary


Model Number

A 20



Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Beyerdynamic A 20 (A20) Like New