Connections
Connect the output of a pre-amplifier or mixer to the jack inputs. The input signal should be of line
level. The maximum output power is obtained when connecting 4 Ohm speakers. It is also possible to connect 8
Ohm speakers; however, the output power will decrease in this case. The speakers must have a power rating
higher than the output of the amplifier. Connect the output of the amplifier to suitable speakers via either the left
and right speakeron connectors. The majority of PA speakers available are 8 Ohms. By connecting two 8 Ohm
speakers together, their rating becomes 4 Ohms, therefore, if you attach two connected speakers to each channel,
you will achieve the maximum power output of the amp. Do not connect two 4 Ohm speakers to each channel as
this will reduce the load to 2 Ohms which is not recommended for this type of amplifier.
Switching On/Off
In order to a avoid loud switching noise, always switch on all other units in an amplifier system
before switching on the power amplifier, and switch it off first after operation. Before switching the unit on or off,
always turn the volume dials to their minimum settings. After switching on, the
PROTECT
LED lights up for
approximately one second. During this time the switch-on delay is activated to protect speakers.
Level adjustment
Set the output of the mixer or pre-amplifier to its rated level (0dB) or to the highest undistorted
output signal. Turn up the controls so far until the maximum desired volume is reached. If the red
CLIP
LED
illuminates (showing an overload of the amplifier), reduce the channel gain.
Protective circuit
The protective circuit is provided to prevent damage to the speakers and the amplifier. If it is
activated, the yellow
PROTECT
LED will light up:
1. Approximately one second after switching on (soft start).
2. If the amplifier is overheated, or if a short circuit has occurred at a speaker output the
CLIP
LED of the
corresponding channel lights up. If this is the case or if the yellow
PROTECT
LED lights up during the operation or
if it is not extinguished after switching on, the amplifier must be switched off and the cause for the defect needs to
be eliminated.
Controls and connections
1. Power switch
2. Channel volume controls
3. Channel Clip LED indicators
4. Channel Signal LED indicators
5. Channel A/B Protect LED indicator
6. Power Indicator LED
7. Fuse
8. AC mains input
9. Speakeron output
10. Unbalanced Jack input
11. Fan
Front and rear panels
