• Switch on the amplifier last and switch it off first. Disconnect from the mains when not in use or when
maintenance activities are performed. Handle the power cable by the plug only.
• Keep power cables away from signal cables to avoid interference.
• Save this user manual for further reference.
4. Overview and use
Refer to the illustration on page 2 of this manual.
1 Clip LED This LED flashes when the channel A output signal is distorted.
2 Gain control: channel A Adjust the volume of channel A.
3 Power LED This LED illuminates when the amplifier is switched on.
4 Protect LEDOn when one of the internal protection circuits is active or no speakers are
5 Gain Control: channel BAdjust the volume of channel B.
6 Clip LED This LED flashes when the channel A output signal is distorted.
7 Power switch Press this button to start operation.
8 Speakon® output Speakon® speaker jack sockets.
9 TRS input socketsfor input signals using balanced ¼” TRS (stereo) jacks
10 RCA input socketsfor input signals using unbalanced phone (RCA) input jacks
11 Ground lift switchSome connected equipment may present hum. This switch will remove the
12 TRS output sockets for output signals using stereo jacks
13 screw outputs for output signals using bare wires
14 fuse holder Only replace the fuse when the device is disconnected from the
15 AC power socket plug the AC power cord into this power socket
16 AC voltage selector Make sure the setting matches your local mains voltage!
connected. Switch off the amplifier and resolve the error condition .
signal ground and reduce the effect of the mains hum.
Mains. Only use fuses of the same rating and power.
5. Notes
•Rack installation
This amplifier can be mounted in a 19” (483mm) rack that allows access to front and rear panel. Make
sure to leave enough space around the device for sufficient ventilation. Note that when mounting in a
rack, the heaviest devices should be mounted closest to the bottom.
Also note that it is not enough to mount the amplifier with 4 screws on the front; the rear must also be
attached to the side bars of the rack.
• Input cables
Using short cables will improve sound quality as high frequencies are absorbed by the cable. Longer
cables may also lead to humming and noise problems. If you do need longer cables, only use balanced
cables.
•Output cables
The high damping factor of the amplifier produces a clear sound reproduction. Long and thin cables will
influence this damping factor and thus the low frequencies in a negative way. To maintain good sound
quality, the damping factor should be around 50. When long cables are unavoidable, make sure they
are thick enough.
• Speakers
Connect your speakers using the Speakon
positive wire and the black terminator with the negative wire.
•Ground lift switch
This switch allows the signal ground or chassis ground to be separated in case of a ground conflict. For
safety reasons it is recommended to keep the switch in the GND FLOATING position unless ground
problems are experienced.
®
or screw outputs. Connect the red terminator with the
Turn the volume knobs of both channels to zero, switch off the amplifier and disconnect from the
mains. Check the front panel, the fuse and all input and output connections. Replace the fuse with a
fuse of the same type and ratings.
• No sound when power LED is switched off.
The power supply is not connected or the amplifier has a blown fuse. Check the power connections
and switches, or replace the fuse located below the power input.
• No sound when power LED is switched on.
No or low input, or faulty speakers. Check if the input is connected and if the LED shows the
presence of a signal. Gently increase the volume level and check the speakers and speaker
connections.
• Hum or buzz.
Power supply noise is picked up in the signal path or earth problem. Only use good quality, shielded
signal cables and ensure they are kept away from the power cables and other AC-powered
equipment. Use a mains tester to ensure the mains outlet has a good earth.
• Distorted sound.
There is an excessive signal level or damaged signal cables. Check the LED to ensure the input level
to the amp is at the correct level. Only use good quality, shielded signal cables and protect them
from damage.
• Sound cuts out.
The signal cables are damaged or the connectors are not properly inserted. Check all cables and
connections.
• Protect LED on
• Check if the amplifier is not overheated. Clean ventilation openings when necessary.
• Check whether the connected speakers have the appropriate impedance. If not, connect speakers
with sufficient impedance. Also verify that the speakers are not short-circuited. Inspect the wiring.
• Inputs receive DC voltage or another technical fault condition has occurred. Switch off the amplifier
and contact your local dealer for servicing.
7. Maintenance
• Regularly wipe the amplifier with a moist, lint-free cloth. Do not use alcohol or solvents.
• Ensure that liquids are not spilled into the enclosure through the ventilation openings.
• Contact your HQPower™ dealer if your amplifier needs servicing.
8. Technical Specifications
VPASG100 VPASG200 VPASG300
RMS power
S/N ratio > 85dB > 90dB > 90dB
weight 9.5kg 10.5kg 12 kg
Use this device with original accessories only. Velleman nv cannot be held responsible in the
event of damage or injury resulted from (incorrect) use of this device. For more info
concerning this product and the latest version of this manual, please visit our website
www.hqpower.eu. The information in this manual is subject to change without prior notice.
No part of this manual or may be copied, reproduced, translated or reduced to any electronic medium or
otherwise without the prior written consent of the copyright holder.