8
3.6. Output connections
The OUTPUT section on the rear panel features Speak-on connectors (12).
Whenever you need to operate the amplifier in BRIDGED mode (mono or bridged), you must set
the “STEREO BRIDGED" Switch (16) to BRIDGED. The input signal is taken from the INPUT
connector on channel I (20) and the signal output to the loudspeaker is on pins 2+ and 2- of
the Speak-on connector “CH1”. The same contacts (2+ and 2-) of the Speak-On connector of
CH2 also carry the bridged signal in order to facilitate the parallel connection of loudspeakers.
ATTENTION: Terminals 1+, 1- must only be used in STEREO operation and terminals
2+, 2- in BRIDGED operation. Other combinations would lead to poor output quality.
When operating in BRIDGED mode, always make sure that the resulting load impedance of the
installation is never below 8 Ohm.
The connection cable that joins the amplifiers outputs and the loudspeakers must be of
good quality, sufficient section and as short as possible. This is most important when the
distances to cover are long ones i.e. up to 10 meters it is recommended to use a section not
inferior to 2.5mm
2
and for superior distances 4mm
2
.
4. OPERATION AND USAGE
4.1. Start up
Pushing the POWER (10) button lights up the integrated pilot light and both red CLIP
PROT (2, 8) LEDs during the approximately 10 seconds needed to stabilize all voltages. The
CLIP PROT LEDs will then turn off meaning that the amplifier is now operative.
In a complete audio installation, it is important to start up the equipment in the following
sequence: sound sources, mixer, equalizers, active filters and finally power amplifiers. To turn
them off the sequence should follow an inverse pattern.
4.2. Input attenuators
This consists of rotative potentiometers, situated on the front panel (4,6).
These attenuators enable the connection of different types of mixing tables, independent
regulation level and loudspeaker connections that allow an inferior power level that the level
already supplied by the power amplifier at its maximum power, with no danger of damaging, by
careless handling, the volume of the pre-amplified mixer.
Inside the device's packaging you will find a little plastic bag containing 2 transparent
caps which protect the input attenuation settings from unwanted manipulation. These caps are
transparent in order to let you visualize the current settings.
Once inserted, they cannot be removed with bare fingers, for this purpose, a small
screwdriver is needed.
