Proel HPX8000 - Manuale (Pagina 13)

13
• 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 Anti-Clip Limit
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.
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.
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 HPX8000 a 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 and in this case the TEMP LED of the correspondent channel on the front panel is lit. After the
temeperature goes back again to normal levels, the TEMP LED goes off and the sound is restored.
AC local power protection
If the AC mains voltage is lower than the allowed working voltage (about 160V for 230V operation or about 80V for 120V
operation), the power supply will be turned off automatically until the mains restores to its minimum working voltage.