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4.2. Front panel LED indicators
The HZA4-70F is equipped with the following front panel LEDs:
STBY
indicator (1): illuminates when the amplifier is in standby (low consumption mode), after
approximately two minutes without any input signal detected. When an input signal is re-detected,
the amplifier automatically switches back to normal operating mode.
Signal Presence indicators, SP (2, 7, 12, 17): warn of the presence of signal at the amplifier inputs.
These indicators illuminate when the input signal exceeds -35dB.
Overload indicators,
OVL
(3, 8, 13, 18): illuminate when the channel reaches its maximum power
capacity, due to a too low load impedance.
CLIP
indicators (4, 9, 14, 19): illuminate when the speakers output signal is close to the actual
clipping level. The CLIP system takes into account possible fluctuations in the supply voltage if
they exist, always giving a real indication. It is normal when you work at high power levels that
CLIP
indicators illuminate to the beat of the low frequencies, which are those with the higher
energy content. Make sure this doesn’t permanently illuminate indicators during normal operating
mode.
Thermal protection indicators,
TH
(5, 10, 15, 20): indicate that the channel over-temperature
protection has been activated; normal operation will be restored when the temperature returns to
the correct operating temperature range.
MERGE
Indicators: they indicate whether the
FLEXIPOWER
function that links two adjacent
channels has been activated with the switches on the rear panel or not.
4.3. Front panel volume controls
The front panel features four volume knobs, one per channel, allowing independent adjustment of
the maximum output level for each amplifier channel.
Remote control ports also allow to adjust the volume of each amplifier channel from a WPm
series panel, a potentiometer or other external hardware device; the actual volume of each channel is
the result of the two volume controls position (front panel and remote control).
In the device packaging, you’ll find a bag with clear caps to be inserted on the front panel knobs.
They protect the input attenuation settings from unsolicited tampering. Once inserted, you must use a
flathead screwdriver or a similar tool to remove them.
4.4.
AUTO STBY ON/OFF
switch
Switch (39) that enables/disables the auto standby mode (sleep or low consumption mode). If this
function is activated, the amplifier will switch to standby after approximately two minutes without any
input signal detected. When an input signal is re-detected, the amplifier automatically switches back to
normal operating mode.
5. CLEANING
The front panel should not be cleaned with dissolvent or abrasive substances because
silk-printing could be damaged. To clean it, use a soft cloth slightly wet with water and neutral liquid
soap; dry it with a clean cloth. Be careful that water never gets into the amplifier through the holes of the
front panel.
