Proel HPX series User Manual download pdf (Page 16)

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.

English

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Proel HPX series User Manual Page 16

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