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© Van de Leur Audio
Manual Van de Leur Audio 402
Table of Contents
Introduction ........................................................................................................................ 3
Guarantee.......................................................................................................................... 3
Safety ................................................................................................................................ 3
Environmental warning ...................................................................................................... 3
Package contents .............................................................................................................. 3
Unboxing ........................................................................................................................... 3
Installation ......................................................................................................................... 4
First use ............................................................................................................................. 4
Front panel ........................................................................................................................ 4
Rear panel ......................................................................................................................... 4
Switching on or off ............................................................................................................. 5
Troubleshooting..................................................................................................................... 6
Other issues and troubleshooting ................................................................................... 6
Specifications Van de Leur Audio 402 ................................................................................... 7
Appendix manual 402 ............................................................................................................ 9
Adjustable Damping Factor (dealer only) ........................................................................ 9
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© Van de Leur Audio
Manual Van de Leur Audio 402
Introduction
Carefully read this manual before using the product. Use this manual to correctly setup your
audio equipment. All the functions and abilities of this product will be described within the
next pages.
Guarantee
All Van de Leur Audio products are built with extreme care. When encountering a problem
with this product, read the troubleshooting pages to solve your problem. Contact your
supplier for further support.
Van de Leur Audio products are sold with a five-year warranty. Warranty voids when the user
has made changes to the product.
Safety
The amplifier complies to the directives 2006/95/EG and 2004/108/EG and has the
marking.
Do not open the amplifier. The amplifier contains AC parts that may pose a threat to your
health. Use the amplifier solely for indoor entertainment purposes.
Always connect the amplifier to a grounded electrical outlet. The amplifier is only suitable for
use on a mains voltage of 230 volts/50 Hz. Use the provided power cord. Grounding the
amplifier is safe and ensures ultimate audio experience.
Please switch off the amplifier when not used for an extended period of time. Use the switch
on the rear panel.
Environmental warning
This product contains components that are harmful to the environment and components that
are recyclable. When disposing of this product, pay attention to the local laws and guidelines.
Package contents
The package of the 402 amplifier contains:
- Van de Leur Audio 402 Class-D dual mono power amplifier
- Power cord
- Manual
Unboxing
Always check the packaging for external damage. In the event of damage, please contact
your supplier. Open the box at the top. Do not use sharp tools to cut the box or tape as you
might damage the product. Do not dispose of the box, as your product can only be shipped
safe in it. Carefully lift the product out of the box.
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© Van de Leur Audio
Manual Van de Leur Audio 402
Installation
Check the amplifier for any visible damage. In the event of damage to the amplifier, contact
your supplier. Make sure the amplifier is plugged into a 230 volts/50 Hz mains supply.
Ensure that there is enough ventilation room. Avoid contact with liquids. Do not install the
amplifier next to sources of electrical interference or heat.
First use
Connect the power amplifier to a source. We recommend the use of a Van de Leur Audio
002 pre-amplifier. Attach the source to one of the inputs: balanced (XLR) or unbalanced
(RCA). Make sure the switch on the rear panel is set in the right position (XLR/RCA). Always
use high quality cables for optimum sound quality.
Connect your loudspeaker to the silver terminals located on the rear panel. The use of
banana/spade plugs is recommended. Pay attention to the polarity (+/-). Make sure there is a
solid connection. Avoid the risk of shortage caused by connecting + directly to -. This may
damage your amplifier.
Finally connect the power amplifier to a power source. Use the provided power cord. Make
sure every connection is solid, and that your source has been switched on, then switch the
power switch on the rear panel to position I. When done correctly, the switch on the front
panel will glow red. Finally switch on the power amplifier by touching the power switch. The
switch only works with bare hands/fingers. When switched on correctly, the red LED will be
substituted by a blue LED.
Front panel
Use the switch on the front to switch the amplifier from standby to power. The LED inside of
the switch will glow red or blue, according to the state of the amplifier (blue for power, red for
standby). The switch only reacts to touch and cannot be pressed. Make sure you use your
bare fingers as it reacts to human touch.
Rear panel
The power inlet, power switch, source input and loudspeaker connectors can be found on the
rear panel of the amplifier.
The power inlet contains a fuse in the compartment underneath the inlet. This also contains
a spare fuse. Only open this compartment after having fully switched of the amplifier. Only
replace the fuse for a similar 6,8A SLOW fuse. When in need of replacing the fuse, please
make sure that the source of blowing the fuse is known and solved.
The power switch is located next to the power inlet. Use this switch to completely power the
amplifier off. We only recommend to use this switch when the amplifier is not used for an
extended period of time.
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© Van de Leur Audio
Manual Van de Leur Audio 402
The inputs consist of balanced (XLR) or unbalanced (RCA) connections. Use the switch
between the inputs to select the right input. When not selected correctly, there will be no
audible sound. We recommend to only use the switch while having the amplifier turned off.
Only one input can be used at once.
The loudspeaker terminals can be found on each side of the rear panel. These are fully
silver plated output terminals. We recommend the use of banana- or spade-plugs. Make sure
the connection is tight and safe. Avoid shortage caused by connecting + to -. This may result
in serious damage to your amplifier.
Switching on or off
Please refrain from switching off the attached source, before switching off the power
amplifier. The attached source might spike the signal up to a dangerous level when being
switched off. This may result in damage to your power amplifier and loudspeaker. Always
switch off the power amplifier first.
In the event of dangerous input signal in the power amplifier, the security switches the
power amplifier off automatically. When this occurs, fully switch off all equipment, including
the power amplifier. Make sure the source of the engaged security is neutralized and let the
power amplifier remain switched off for five (5) minutes. After this procedure, your power
amplifier should be operating normally.
The security ‘kick-in’ can be recognized by an audible ‘click-sound’, not being confused with
the click heard when switching the amplifier on. If the amplifier remains in security-phase,
please contact your supplier.
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© Van de Leur Audio
Manual Van de Leur Audio 402
Troubleshooting
No LED glow from front panel power switch.
The LED of the power switch located at the front panel doesn’t illuminate.
- Make sure the power cord is connected properly to an active power source.
- The fuse is broken. Replace the fuse with the spare fuse located in the compartment
underneath the power inlet. Make sure the amplifier is switched off and that the power cord
has been removed. If the cause of the broken fuse is not clear, contact your supplier. (please
check p. 4)
No audible sound
The power amplifier has been switched on, but there is no audible sound.
- Ensure the LED of the front power switch is illuminated blue. If red, touch the switch to
switch the amplifier on. The LED should be illuminated blue.
- Ensure all the sources are switched on (pre-amplifier etc.) and are functioning correctly.
- Ensure the input switch on the rear panel has been set to the right input (XLR/RCA)
- The amplifier entered security mode (audible click, please check p. 5).
Interfering noise
When correctly installed, the amplifier should be quiet when not receiving audio signal. It can
occur that audible interference or ground loops can be heard. These sound like hums,
crackles or beeps.
- Check all the cables. Use high quality shielded cables and connect as advised by your
supplier.
- Ensure ground connection. Always proper ground the amplifier.
- Remove sources of interference next to the equipment and cables.
- Avoid ground loops. They occur when connected devices do not use the same ground
point. Try to detach unnecessary equipment.
Other issues and troubleshooting
Contact your supplier or Van de Leur Audio for all questions or problems related to
troubleshooting. Check Vandeleuraudio.com for up to date contact information.
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© Van de Leur Audio
Manual Van de Leur Audio 402
Specifications Van de Leur Audio 402
Technical specifications
See graphs on the next page for more specifications.
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© Van de Leur Audio
Manual Van de Leur Audio 402
Frequency response @ 4 ohm, 8 ohm and open circuit
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© Van de Leur Audio
Manual Van de Leur Audio 402
Appendix manual 402
Adjustable Damping Factor (dealer only)
The amplifier is equipped with an adjustable damping factor. This circuit is used to lower the
damping factor and hereby adjusting the amplifier to the attached loudspeakers. The result is
often experienced more musical, or ‘tube’ like.
Dealers and professionals are allowed to adjust the circuit to adapt the amplifier to the
desired needs. The circuit board on the rear panel is where the adjustment can be achieved.
The switch on the board switches between normal settings and low settings. The amplifier
has been standardly set to low.
To switch the amplifier to regular settings, switch it to normal. The adjustment will be passedby.
The amount of damping applied, can be adjusted by switching soldered resistors. Switch the
resistors on both (left and right) circuit boards for a wanted value according to the table
below. The resistor is indicated as ‘Adjust DF’ and is located on the top of the print. The
resistor is raised above the print, for easy replacement.
Ask your dealer or contact Van de Leur Audio for advise on customizing the damping factor.
Resistor values put next to the achieved damping factor:
Resistor
Damping factor (relative)
4k7 (standard)
0.5
10k
1
22k
2
39k
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Note: the lower the damping factor, the bigger the change between normal and low setting.
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© Van de Leur Audio
Manual Van de Leur Audio 402