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HA-04 Headphone Amplifier
Item no. 31 25 69
1. Intended use
The headphone amplifier enables the amplification of input signals of a connected audio source, and playback
over up to four connected headphones. The volume for each set of headphones connected can be adjusted
individually. It is intended for indoor use only. Do not use it outdoors. Contact with moisture, e.g. in bathrooms,
must be avoided under all circumstances.
For safety and approval purposes (CE), you must not rebuild and/or modify this product. If you use the product
for purposes other than those described above, the product may be damaged. In addition, improper use can
cause hazards such as short circuiting, fire, electric shock etc. Read the instructions carefully and keep them.
Make this product available to third parties only together with its operating instructions.
2. Delivery content
• Headphone amplifier
• Power adaptor
• Adaptors (2 cinch sockets to 6.3 mm jacks)
• Operating instructions
3. Safety instructions
Read the operating instructions carefully and especially observe the safety information. If
you do not follow the safety instructions and information on proper handling in this manual,
we assume no liability for any resulting personal injury or damage to property. Such cases
will invalidate the warranty/guarantee.
Persons / Product
• Do not listen to excessively loud music over a longer period of time. This may damage your hearing.
• Use the headphones only when circumstances allow operation. Make sure that the operation of the device
does not impair your concentration on your immediate surroundings.
• B efore connecting the headphone amplifier, disconnect it from the power supply.
• B efore connecting, switch off all devices that are to be plugged into the headphone amplifier and disconnect
them from the mains power supply. Proceed in the same way when changing the circuit.
• Only operate the headphone amplifier on a stable surface that is not sensitive to high temperatures. Place
the device horizontally to prevent insufficient air circulation.
• As power supply, only use the supplied mains adaptor.
• Only connect the power adaptor to a normal mains socket connected to the public supply. Before plugging
in the power adaptor, check whether the voltage stated on the power adaptor complies with the voltage of
your electricity supplier.
• Never connect or disconnect power adaptors if your hands are wet.
• Never unplug the power adaptor from the mains socket by pulling on the cable; always use the grips on
the plug.
• When setting up the product, make sure that the cable is not pinched, kinked or damaged by sharp edges.
• Always lay the cables so that nobody can trip over or become entangled in them. This poses a risk of injury.
• For safety reasons, disconnect the power adaptor from the mains socket during storms.
• The device is not a toy. Keep it out of the reach of children and pets.
• Do not leave packaging material lying around carelessly. These may become dangerous playing material
for children.
• Protect the product from extreme temperatures, direct sunlight, strong jolts, high humidity, moisture,
flammable gases, vapours and solvents.
• Do not place the product under any mechanical stress.
• If it is no longer possible to operate the product safely, take it out of operation and protect it from any
accidental use. Safe operation can no longer be guaranteed if the product:
- is visibly damaged,
- is no longer working properly,
- has been stored for extended periods in poor ambient conditions or
- has been subjected to any serious transport-related stresses.
• Please handle the product carefully. Jolts, impacts or a fall even from a low height can damage the product.
• Also observe the safety and operating instructions of any other devices which are connected to the product.
Miscellaneous
• Consult an expert when in doubt about operation, safety or connection of the device.
• Maintenance, modifications and repairs are to be performed exclusively by an expert or at a qualified shop.
• If you have questions which remain unanswered by these operating instructions, contact our technical
support service or other technical personnel.
312569_v1_1112_02_m.indd 2
4. Operating elements
Version 11/12
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1 Volume control dials "VOLUME 1 - 4"
2 Operation indicator "POWER"
3 Power socket "DC 12V"
4 Connection socket "INPUT"
5. Operation
1. Switch the audio source off and turn its volume control to zero. Turn all 4 of the headphone amplifier volume
control dials ("VOLUME 1" to "VOLUME 4") counterclockwise as far as they will go.
2. Connect your audio source (via a line output) to the cinch sockets on the audio adaptor (white -> left
channel, red -> right channel). Connect the stereo jack of the audio adaptor to the "INPUT" connection
socket on the headphone amplifier.
3. Connect up to four headphones (with 6.3 mm headphone stereo jacks) to the headphone connection
sockets "CH-1" to "CH-4".
4. Connect the power adaptor's power plug to the "DC 12V" power socket on the back of the headphone amplifier.
Connect the power adaptor to a suitable mains socket. The operation indicator "POWER" lights up.
5. Switch the audio source on and start the audio playback. Set the desired volume.
6. Set the volume for each set of headphones connected by individually adjusting the volume control dials
"VOLUME 1" to "VOLUME 4". Turn the volume control dials on the headphone amplifier clockwise to
increase the volume, and counterclockwise to decrease the volume.
7. If you plan to not use the product for a longer period of time, disconnect it from the power supply.
Caution! Risk of hearing damage!
Too high a volume can cause hearing damage.
6. Cleaning
• Before cleaning, disconnect the product from the mains supply.
• It is sufficient to use a clean, dry and soft cloth to clean the product. Do not use any abrasive cleaning
agents.
7. Disposal
Electronic devices are recyclable waste and must not be disposed of in the household waste.
At the end of its service life, dispose of the product according to the relevant statutory regulations.
8. Technical data
Headphone Amplifier
Input voltage/current:
Current consumption:
Power output:
Total harmonic distortion (THD):
Headphone impedance:
Signal-to-noise ratio:
Input:
Output:
Dimensions (W x H x D):
Weight:
Power adaptor
Operating voltage:
Output voltage/current:
These operating instructions are published by Conrad Electronic SE,
Klaus-Conrad-Straße 1, D-92240 Hirschau/Germany.
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming,
or the capture in electronic data processing systems require the prior written approval by the editor.
Reprinting, also in part, is prohibited.
The operating instructions reflect the current technical specifications at time of print.
We reserve the right to change the technical or physical specifications.
© 2012 by Conrad Electronic SE.
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5 Headphones connection socket "CH-1 - CH-4"
6 Audio adaptor
7 Power adaptor
8 Power plug
12 V/DC / 200 mA
max. 150 mA (64 Ω)
2 x 80 mW (per channel)
<0,02 %
32 - 64 Ω
78 dB
6.3 mm stereo jack
6.3 mm headphone jack
130 x 35 x 85 mm
319 g
100 - 240 V/AC, 50/60 Hz
12 V/DC / 0.5 A
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4
5
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V1_1112_02-JH
11/16/2012 11:58:40 AM
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