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• Be careful when mounting the amplifier. Put the heaviest device in the lower part of the rack. Note that
fastening the amplifier with four screws on the front panel is not enough. Use additional metal bars to support
the sides and the ground panel of the device.
• Attach the rear bracket to the ground or side bars when the device is to be transported. This keeps the
amplifier from being pushed backwards.
b. Inputs
• A good cable run improves the sound quality remarkably. Input cables should be short and direct, since high
frequencies will mostly be absorbed if the cables are unnecessarily long. Besides that, a longer may lead to
humming and noise trouble. If long cable runs are unavoidable, you should use balanced cables.
• Professionals are recommended to connect the input cables via balanced XLR jacks.
c. Outputs
• The high damping factor of your amplifier ensures a clear sound reproduction. Unnecessarily long and thin
cables will influence the damping factor and thus the low frequencies in a negative way. In order to safeguard
good sound quality, the damping factor should be around 50. The longer a cable, the thicker it should be.
• Connect your speaker systems via the speaker plugs or the banana / screw combination (red+, black-).
Be careful of the high voltage at the screw terminal. Switch off the amplifier before
connecting the device.
d. Speaker - Socket
• Your amplifier is equipped with 4-pole, lockable speaker sockets. Turn the plug to the right to lock the
connection. To unlock: pull the unlock button, turn to the left and pull the plug out of the socket.
e. Choosing Appropriate Connection Cables
• Use sufficiently thick cables to connect the speaker system. Thin cables may heat up and cause significant
power loss and loss in sound quality.
• For all speaker systems up to 400W, we recommend a cable diameter of 2.5mm²; for all other speaker cables
it's 4mm².
• The high damping factor of your amplifier ensures a clear sound reproduction. Unnecessarily long and thin
cables will influence the damping factor and thus the low frequencies in a negative way. In order to safeguard
good sound quality, the damping factor should be around 50. The longer a cable, the thicker it should be.
Example: A damping factor of 200 is reduced to 47 (8 ohms) when using a diameter of 2.5mm² speaker cable
of 10m in length. The power loss at 8 ohms is 1.63%, at 4 ohms it's 3.25% and at 2 ohms it's as
much as 6.5%.
• The maximum cable length is 30m!
f. Installing the Speaker Cables
• Connect the cable of the first speaker system with speaker outputs CH-1 and output CH-2 of the amplifier. The
signal will be transmitted to the individual speaker systems.
• Always handle the cables with care and protect them from damage in transit.
VPA2100U1
PIN
1 +
2 +
+
1 -
2 -
-
5
VELLEMAN
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