User`s manual

12
20. Channel 2 XLR input
Same as above but for channel 2 input. It operates only in STEREO mode.
21. Channel 1 JACK input
This is a JACK female connector, which accepts a JACK plug from almost any type of equipment with a balanced or
unbalanced line level outputs. The JACK input is wired as follows:
Tip = + positive or "hot"
Ring = - negative or "cold"
Sleeve = shield or ground
When connecting an unbalanced signal, wire them as follows:
Tip = + positive or "hot"
Sleeve = shield or ground
This JACK female connector is connected in parallel with the respective XLR input female connector of Channel 1. This
enables a second unit (e.g. another amplifi er) to be daisy-chained to the fi rst. It’s thus possible to power several amplifi ers
using the same signal, forming more powerful sound reinforcement systems.
22. Channel 2 JACK input
Same as above but for channel 2 input. It operates only in STEREO mode.
23. Channel 1 RCA input
This is a RCA female connector, which accepts a RCA plug from almost any type of equipment with a unbalanced line
level outputs. The RCA input is wired as follows:
Tip = + positive or "hot"
Sleeve = shield / ground
24. Channel 2 RCA input
Same as above but for channel 2 input. It operates only in STEREO mode.
25. GAIN switch
Allows the selection of the amplifi er gain. See technical specifi cation at page 3 for details.
NOTE: The fi xed GAIN of 32dB is a useful feature to set a complex loudspeaker system using a loudspeaker processor:
in fact having a fi xed gain the calculation of fi lters and limiters are simplifi ed. Consult the manual of your loudspeaker
processor for details.
26. LPN switch
This switch enables the LPN fi lter (Low-Pass Notch). This fi lter enhances the amplifi er response at the low frequencies (60
Hz +5 dB) and cut the very low frequency as shown in FIG. 3, providing an increased punch while protecting the speakers
from over-excursion and increasing the headroom.
27. STEREO / BRIDGE / PARALLEL mode selector
Allows the selection of STEREO, PARALLEL or BRIDGE mode operations.
• In STEREO mode each amplifi er channel runs indipendently driven by respective input.
• In PARALLEL mode both amplifi er channels run together driven by Channel 1 input.
• In BRIDGE mode both amplifi er channels run toghether but with channel 1 in phase and channel 2 out of phase, both
channels are driven by Channel 1 input and the output must be taken from "BRIDGE" binding post output.
28. Channel 1 SPEAKON output
Accepts a male Neutrik Speakon NL4C connector wired in this way:
• PIN 1+ connected to POSITIVE output of Channel 1;
• PIN 1- connected to NEGATIVE output of Channel 1;
• PIN 2+ and 2- NOT connected.
If you connect a standard 2 wire cable (1+/1-), you run to the speaker the amplifi ed output of the signal applied to channel
1 input.
Always connect a louspeaker with a minumum impedance of 2 ohm or more.
NOTE: Use only loudspeaker enclosure cables, never signal cables, i.e. those normally used for microphones, instruments
and audio equipment in general.
29. Channel 2 SPEAKON output
Accepts a male Neutrik Speakon NL4C connector wired in this way:
• PIN 1+ connected to POSITIVE output of Channel 2;
• PIN 1- connected to NEGATIVE output of Channel 2;
• PIN 2+ and 2- NOT connected.
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