A 1 – Safety Information
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1. Features
• The A 1 is a high-quality headphone amplifier which has been developed and manufactured in Germany for
headphones with a nominal impedance between 30 and 600 ohms.
• The special circuit design provides an impressing natural sound reproduction with an excellent resolution and
spatiality.
• The powerful mains adapter avoids dynamic distortions.
• Although we have developed the A 1 for use with our Premium Line headphones, you can use also headphones
of other manufacturers.
• The A 1 is ideal for very different impedances, because the high output impedance at the headphone socket
ensures that the range of the volume potentiometer remains ideal even for low-impedance transducers.
• Intelligent circuit design with microcontroller capable of 96 kHz
• Volume control with high-quality ALPS potentiometer
• Large dimensioned toroidal core transformator for high fidelity of impulse and dynamics
• Two stereo inputs for alternative sound sources
• Blue LEDs to indicate the active signal input, multicolour power LED
• Gold plated audio sockets for perfect signal transmission
2. Important safety information
• Read the Operating Instructions.
• Keep these Operating Instructions safe.
• Comply with the Operating and Safety instructions listed.
• Heed all warnings.
• Install the A 1 as described in these operating instructions.
• To avoid damage to your hearing always reduce the volume before putting the A 1 into operation and when
changing the audio source, as the connected devices or reproduced audio data can have very different output
levels.
• The A 1 is not designed for outside use. To reduce the risk of fire or electric shock, do not expose the A 1 to
rain or moisture. For this reason do not install it in the immediate vicinity of swimming pools, showers, damp
basement rooms or other areas with unusually high atmospheric humidity.
• Never place objects containing liquid (e.g. vases or drinking glasses) on the A 1. Liquids in the A 1 could cause a
short circuit.
• Only clean the A 1 with a dry cloth.
• Never install and operate the A 1 close to radiators, lighting equipment or other heat generating equipment.
• Never place naked flames near the A 1.
• Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the
point where they exit from the apparatus.
• Lay all connection cables so that they do not present a trip hazard.
• Unplug the A 1during lightning storms or when unused for long periods of time.
• Check whether the connection figures comply with the existing mains supply. Serious damage could occur due to
connecting the A 1 to the wrong power supply. An incorrect mains voltage could damage the A 1 or cause an
electric shock.
• If the A 1 causes a blown fuse or a short circuit, disconnect it from the mains and have it checked and repaired.
• Do not open the equipment without authorisation. You could receive an electric shock. Leave all service work to
authorised expert personnel.
• Do not hold the mains cable with wet hands. There must be no water or dust on the contact pins. In both cases
you could receive an electric shock.
• The mains cable must be firmly connected. If it is loose there is a fire hazard.
• Always pull out the mains cable from the mains and/or from the equipment by the plug, never by the cable. The
cable could be damaged and cause an electric shock or fire.
• The A 1 must not be operated when the mains cable is damaged.
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