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3. INSTALLATION
3.1. Placement and mounting
The amplifier is presented as a 2 unit high 19'' rack module. It is supplied with plastic washers in
order not to damage the unit when tightening the screws.
It is very important not to enclose the amplifier or expose it to extreme temperatures as it
generates heat.
It’s also necessary to promote the passage of fresh air through the ventilation
holes of the chassis, leaving at least one rack unit off between each device and installed above
and below it in the rack frame.
If the setup has several amplifiers in the same rack or in a closed cabinet with doors, it is highly
recommended to supply them forced ventilation, installing fans at the upper and lower ends. This upward
air flow will help to dissipate the heat generated inside.
In order to optimize as much as possible the correct thermal dissipation of equipment installed in
a closed rack, it is advisable not to place power amplifiers under other appliances, but upon these ones.
3.2. Mains connection
The NZA4-70 amplifiers are fed with alternate currents, depending on the country, of 110-120,
220-240V 47-63Hz. (see characteristics in the back of the unit).
The amplifier should have an earth connection in good conditions (earth resistance, Rg=30
or
less). The environment must be dry and dustless. Do not expose the unit to rain or water splashes, and
do not place liquid containers or incandescent objects like candles on top of the unit. Do not obstruct the
ventilation grids with any kind of material.
In case there is some type of intervention and/or connection-disconnection of the amplifier, it is most
important to previously disconnect the mains power supply. There are no user or serviceable parts inside
the amplifier.
You should avoid that the supply cable twists with the shielded signal cables, as this could lead to
unwanted hum.
In order to protect the unit from an eventual electrical overload or momentary power peaks from
the internal circuits it carries a fuse. Should it ever blow up, unplug the unit from mains and replace it
with an identical one. If the new fuse blows again contact immediately with our Authorized Technical
Service.
CAUTION: YOU MUST NEVER USE A HIGHER VALUE FUSE.
3.3. Signal input connections
The amplifier HZA4-120F features 4 balanced and line level analog signal inputs (one per
amplification channel) on its rear panel.
Signal input connectors are 3 position
screw terminal block (40, 41, 43, 45). The wiring
is:
HOT or direct signal
>
Pin +
COLD or inverted signal
>
Pin -
GROUND
>
Pin
For unbalanced connection short-circuit
pin
to pin -.
