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(*) NOTE: This amplifier follows the ground interconnection specification
defined by AES48-2005 standard of the Audio Engineering Society, on
grounding and EMC practices for audio equipment containing active circuitry.
For that reason, when a source with unbalanced outputs should be connected,
it is recommended not to use Pin1 of the XLR, and never connect it to Pin3. If a
shielded cable is available, the shield may be connected to Pin1 of the XLR to
get some shielding, leaving the other end unconnected
.
Pin1 connection is only
advised if the equipment with the unbalanced output has a dedicated
connection for the shield, separate from the audio signal ground reference.
7 - OPERATION MODES
Stereo
In Stereo mode, each one of the amplifier channels works
independently from the other. To select it, make sure that the MODE
selector, located next to the input section (BALANCED INPUTS) is in
the STEREO position (down).
Parallel
In this mode, the signal inserted at CHA input will be routed to
both channel’s power modules (CHA and CHB), ignoring the
signal at CHB input. This option is useful when a series of
speakers must be fed with the same signal, because the signal
can be routed saving extra cable connections between inputs. To
use Parallel Mode, place the MODE selector switch in PARALLEL
position. The corresponding indicator located on the front panel
will light up (PARALLEL).
Bridge (Mono)
In this position both channels are used as a single amplifier,
capable of delivering the double of the power. In this operational
mode the input signal must be fed through CHA input connector.
At the output, connections must be made as following:
The + Pole of the speaker is connected to the Speakon Pin +1 of
CH A, or the Red terminal of the CH A. The – Pole of the speaker
is connected to the Speakon Pin +2 of CH A, or the Red terminal
of the CH B.
To use MONO mode, place the MODE selector switch in BRIDGE position (Up). The
corresponding indicator located on the front panel will light up (BRIDGE). The
amplifier gain will be controlled exclusively by CHA gain potentiometer.
IMPORTANT:
The recommended load impedance for bridge mode is 8 Ohm. If the
load impedance is 4 Ohm, each power module will work at an effective impedance of
2 Ohm, and therefore permanent installations are discouraged in these conditions
(see “Load Capacity” section). Please check the specifications table to learn the
delivered power in Bridge mode.
CAUTION: In this situation, it could be dangerous to handle the connections by non-
authorized personnel, due to manipulation of high voltage.
