Proel HPX series - Manual (Page 16)

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This is the amplified output of the signal applied to channel 2 input if the amplifier is set in STEREO mode or the signal
applied to channel 1 input if the amplifier is set in PARALLEL mode.
Always connect a loudspeaker with a minimum impedance of 2 ohm or more.
30. Channel 1 BINDING POST output
Accepts a couple of unsheat wires (see the suggested cables at page 4 and the connection at page 5):
• RED terminal + connected to POSITIVE output of Channel 1;
• BLACK - connected to NEGATIVE output of Channel 1;
Always connect a loudspeaker with a minimum impedance of 2 ohm or more.
31. Channel 2 BINDING POST output
Accepts a couple of unsheat wires (see the suggested cables at page 4 and the connection at page 5):
• RED + connected to POSITIVE output of Channel 2;
• BLACK - connected to NEGATIVE output of Channel 2;
This is the amplified output of the signal applied to channel 2 input if the amplifier is set in STEREO mode or the signal
applied to channel 1 input if the amplifier is set in PARALLEL mode.
Always connect a loudspeaker with a minimum impedance of 2 ohm or more.
32. BRIDGE BINDING POST output
When the amplifier is used in bridged mono mode, use the two red binding posts to connect your single speaker output.
Accepts a couple of unsheat wires, wired in this way:
• RED + connected to POSITIVE output;
• RED - connected to NEGATIVE output;
This is the amplified output of the signal applied to channel 1 input if the amplifier is set in BRIDGE mode. Always connect
a loudspeaker with a minimum impedance of 4 ohm or more. See also Fig. 7.
NOTE: Use this output alone and only with BRIDGE mode setting.
ADVANCED FEATURES
CLIP Limit / Distortion protection
The clip limiter circuits dinamically reduce the gain of the amplifiers when these are driven near to clip distortion. When
activated the LIMIT LED lights up.
While some audio systems may already contain protective limiters preceeding the amplifier, the amplifier’s clip limiters
generally will not noticeably affect output quality.
For systems without additional protection, the clip limiters can enhance your system’s output quality and prevent
catastrophic damage to your speakers.
Even with the Anti-Clip Limiters, your amplifier should never be operated at a level which causes the front-panel Clip LEDs
to illuminate constantly. While the Anti-Clip Limiters help to prevent damage due to peak signal distortion, your speakers
can still be damaged by excess of mean power dissipation.
Short Circuit protection
In case of short circuit of loudspeaker cables or in case of connection of a loudspeaker load less than the minimum
specified, the amplifier shuts down indicating on the front panel the protection status: PROTECT LED illuminates. Removing
the fault condition the amplifier restores its normal operation.
Loudspeaker DC protection
In case of fault of the internal mosfet devices, the loudspeakers are protected from DC voltage output. The amplifier shuts
down indicating on the front panel the protection status and PROTECT LED illuminates. If you disconnect the loudspeaker
the amplifier remains in protection status.
Very High Frequency protection
A ultrasonic network decouples the high frequency, over audible range, from the outputs and keeps the amplifier stable
with reactive loads, it also trips if a long time feedback at high frequency occurs.
Thermal protection
The fans are controlled by sensing the heat-sink temperature and they keeps the amplifier full operative also in heavy
conditions. In the HPX2400 and HPX2800 another sensing circuit can reduce the output power if the heat-sink is over
heating. This is a in-audible progressive reduction that can't stop the sound in any case. Only in very extreme conditions
the amplifier can be muted due to over-heating.
AC local power protection
If the AC mains voltage is lower than the allowed working voltage (~160V for 230V operation or ~80V for 120V operation),
the power supply will be turned off automatically until the mains restores to its minimum working voltage.
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