Advanced Features - Proel HP-X 4600 Benutzerhandbuch

• 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.
29. 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

Distortion protection Limit and SOFT CLIPPING Limit
Anti-Clip
The always active Anti-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, generally it will not noticeably affect output quality. Even with
the Anti-Clip Limiters, your amplifier should never be operated at a level which causes the front-panel LIMIT LEDs to
illuminate constantly.
In addition to the Anti-Clip limiters, another internal circuit can be activated: the SOFT CLIPPING that smoothly limit the
wave form more gently than the Anti-Clip limiters.
For systems without additional protection, using both the clip limiters can enhance your system's output quality and
prevent catastrophic damage to your speakers. In this case remember always that while the Anti-Clip Limiter helps to
prevent damage due to peak signal distortion, your speakers can still be damaged by excess of mean power dissipation.
For systems with a loudspeaker processor preceding the amplifier in the audio chain and already set to limit the signal
properly (see the loudspeaker processor user manual) the SOFT CLIPPING circuit must be preferably not activated.
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 after 10 seconds.
Loudspeaker DC protection
In case of fault of the internal mosfet devices, the loudspeakers are protected from DC voltage output by means of an
internal Relay that disconnect the load. The amplifier shuts down indicating on the front panel the protection status and
PROTECT LED illuminates. Even if the internal Relay cannot disconnect the load for any reason, a circuitry forces an
internal short circuit that blows the internal fuses (this is another protection for your loudspeaker).
Note: Even 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 HPX4600 and HPX6000 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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