11
INSTALLATION
The DN330 is designed for fixed installations where it is conventionally mounted into a standard 19”
equipment rack. The unit occupies only 1U of height and due to the low operating power requirements
of this unit, heat generation is kept to a minimum allowing units to be stacked above each other with no
ill effects. For continued reliability it is not recommended that the equalisers are located immediately
above heat generating units such as power amplifiers or mixer power supplies. If this is unavoidable a
vent panel between the units is advisable.
Precautions
Do not install this unit in a location subjected to excessive heat, dust or mechanical vibration. before
connecting the unit to the mains supply, ensure that the operating voltage is correct for your local supply.
It is important that you observe the following precautions.
Voltage Selection & Power Connection
Connection to the mains supply is by means of a standard IEC power socket. The rear panel voltage
label indicates the voltage required for satisfactory operation of the unit. To change the mains voltage
please refer to the ‘ Voltage Changeover‘ section on page 12.
IMPORTANT Mains voltage adjustments should only be carried out by a qualified service technician.
The DC supply can be connected either by separate 4mm ( Banana ) plugs or by use of the dual stacking
version. Correct polarity must be observed for operation, though the unit is protected against reverse
polarity. Please refer to the section below regarding DC operation.
NOTE: As there is no power on/off switch on this unit, as soon as the power (Mains or DC ) is connected
the unit will be active.
Safety Warning
This unit is fitted with a 3-pin power socket. For safety reasons the earth lead MUST NOT be
disconnected. An internal ‘floating’ audio ground reference is used to ensure no earth loop problems
occur related to the installation of this unit. Should any ground loop problems be encountered they will
be caused by the commoning of the grounds of the other equipment connected to the equaliser.
The DN330 can be made the central ground reference as detailed on page 12, this modification should
only be carried out by qualified service technician.
To prevent shock or fire hazard, do not expose the unit to rain or moisture, only replace fuses with the
correct type and rating.
Do not remove the covers, refer servicing to qualified personnel only.
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