Beyerdynamic A1 Headphone Amplifier

With the introduction of the A1, Beyerdynamic enters a new area of audio reproduction. After intense fundamental research, Beyerdynamic have succeeded in developing a brand new audiophile-quality headphone amplifier, providing precise audio performance even when used with demanding 600 ohm headphones. With its unique intelligent-circuit concept, the A1is capable of reproducing an amazingly wide frequency range which stretches way above human perception.

Underneath the large front-panel-mounted aluminium volume control of the A1 fromBeyerdynamic is a high grade ALPS-potentiometer for smooth volume adjustment. This is just part of the attention to detail that ranges from the outer unit construction to its quality integral components - use of a generously-dimensioned toroidal core transformer, plus a combination of carefully selected components in the A1 allows even the highest-impedance headphones to be driven flawlessly over the entire frequency range. The provision of a special impedance headphone output ensures that the control range of the volume potentiometer is also ideal for headphones with lower impedance.

The first of the two provided line-ins is hardwired to the A1 line out. The result allows the incoming signal to be looped through even with the A1 in standby mode. So you only have to power up the A1 if you want to increase the enjoyment of your music using your headphones. Two blue LEDs in the front panel monitor the active signal input, with a further multicolour LED giving information about the A1's operating status.

Beyerdynamic A1 Features

• Intelligent Circuit Design
• Noiseless Signal Switching
• Noiseless Power Up/Down
• Big volume control with high-grade ALPS potentiometer
• 2 LEDs to indicate the active signal input
• Multicolour Power LED
• 1/4" headphone socket (6.35 mm)
• Two stereo inputs for 2 sound sources, 2 selector buttons
• Stereo output
• Stand-by button

Technical Specifications

• Input impedance: 50 kΩ
• Maximum amplification: 18 dB
• Frequency response: 1 Hz - 100 kHz (-1dB)
• THD (total harmonic distortion): 0.001 % at 170 mW/ 250 Ω
• Channel separation: > 89 dB
• Output power @ 600 Ω: 100 mW
• Output power @ 250 Ω: 170 mW
• Output power @ 30 Ω: 150 mW
• Signal to noise ratio: > 100 dB
• Power consumption :< 15 W internal, controlled power adapter 
• Dimensions: 250 x 225 x 50 mm
• Audio connections: Headphone out (1/4") jack gold plated, 1 line out, 2 line in (gold plated RCA jacks)
• Nominal power: 220 - 240 V/ 50 - 60 Hz
• Weight: Approx. 2.3 kg

Package Includes

• Beyerdynamic A1 Audiophile High-Definition Headphone Amplifier in Charcoal Grey
• Special cloth for cleaning and protecting
• High-quality stereo RCA cables
• Power cable