Proel HPX series - Manual (Page 15)

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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 amplifier) to be daisy-chained to the first. It’s thus possible to power several amplifiers
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 amplifier gain. See technical specification at page 3 for details.
NOTE: The fixed GAIN of 32dB is a useful feature to set a complex loudspeaker system using a loudspeaker processor:
in fact having a fixed gain the calculation of filters and limiters are simplified. Consult the manual of your loudspeaker
processor for details.
26. LPN switch
This switch enables the LPN filter (Low-Pass Notch). This filter enhances the amplifier 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 amplifier channel runs indipendently driven by respective input.
• In PARALLEL mode both amplifier channels run together driven by Channel 1 input.
• In BRIDGE mode both amplifier 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 amplified output of the signal applied to channel
1 input.
Always connect a loudspeaker with a minimum 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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