Included: Power Cord
Intelligent circuit design with microcontroller capable of 96 kHz Input impedance 50 k Maximum Amplification 18 dB
Two stereo audio inputs for two sound sources (RCA) Audio connections — Headphone socket, 1 Line output
Output power 100 mW / 600, 170 mW / 250 ¿. 150 mW / 30 v —
T.H.D. 0.001% at 170 mW / 250 — Mica capacitors only; no ceramic capacitors due to their generation of voltage under stress
Very reliable cooling concept; including permanent short circuit protection on the output
The A 1 headphone amplifier has been developed to operate headphones with nominal impedance from 30 to 600 ohms. It provides excellent audio quality with high volume and strong bass response. The special circuit design features an amazingly natural sound reproduction with an excellent resolution and spatiality. The entire circuitry is capable to transmit 96 kHz allowing the transmission of the whole frequency response of a SA-CD or DVD audio. Due to a microprocessor-controlled relay, two high-class stereo sound sources can be selected silently. The volume control is made of solid aluminum with a high-grade ALPS potentiometer inside. The gold-plated RCA connections on the rear allow the connection of audio sources and provide a signal transmission without loss. A large dimensioned toroidal core transformer ensures high fidelity of impulse and dynamics. The combination of selected high-grade components allows even the highest-impedance headphones to be driven flawlessly over the entire frequency range. High impedance at the headphones output ensures the control range of the volume potentiometer to be perfect for low-impedance headphones, too. One input is passively connected with the Lineout of the A 1 to loop through incoming signals even when the A 1 is in stand-by mode. Two blue LEDs on the front display the active signal input, another multicolor LED shows the operating status (stand-by or active).
From the Manufacturer
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 the demanding 600 ohm premium line of beyerdynamic headphones. With its unique intelligent-circuit concept, the A1 is capable of reproducing an amazingly wide frequency range which stretches way above human perception and can take your music to a new level.
The entire circuit is capable of handling frequencies of up to 96 kHz, which enables the transfer of pure, uncompressed audio from either SA-CD or other HD audio sources. A micro-processor-controlled relay allows noiseless switching between two different high quality audio signals and avoids unpleasant clicking when powering the A1 on or off.
Quality Components To Benefit Any Headphone
Underneath the large front-panel-mounted aluminum volume control is a high grade ALPS-potentiometer for smooth volume adjustment. It’s all part of beyerdynamic’s attention to detail that ranges from the outer unit construction to its quality integral components–use of a generously-sized toroidal core transformer and other carefully selected components 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, so any headphone can benefit.
Intelligent Pass-Through Works With and Without Power
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 multicolor LED giving information about the A1’s operating status. The beyerdynamic A1 is an uncompromising companion for your headphones and a pure masterpiece in audio achievement.
Works With Any Impedance of Headphones
The A1 headphone amplifier has been developed to operate headphones with a nominal impedance from 30 to 600 ohms. It provides your music sources with better audio quality–higher volume and stronger bass response. The special circuit design features an amazingly natural sound reproduction with an excellent resolution and spatiality. The entire circuitry is capable to transmit 96 kHz allowing the transmission of the whole frequency response of a SA-CD or other HD audio sources.
Noiseless A/B Source Switching
Due to a microprocessor-controlled relay two high-class stereo sound sources can be selected silently without any unpleasant cracking noise when turning the A1 on /off or when changing the audio source.
Maximum Amplification: 18 dB
Frequency Response: 1 Hz – 100 Khz (-1 dB)
T.H.D.: 0.001% At 170 mW / 250 Ohms
Channel Separation: > 89 dB
Output Power: 100 mW / 600 Ohms; 170 mW / 250 Ohms; 150 mW / 30 Ohms
Unweighted Signal-To-Noise Ratio: > 100 dB
Output Impedances: Line Out, 100 Ohms headphone output
Power Consumption: < 15 W via internal, controlled power pack
Supply Voltage: 110 – 120 V AC
Audio Connections: Headphone socket, 1 Line Output, 2 Audio Inputs (gold-plated RCA sockets)
Dimensions: 250 X 225 X 50 mm
Weight: 2.3 kg
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