Drawmer dl441, Руководство оператора

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DL441 OPERATORS’ MANUAL 3
INSTALLATION
The DL441 is designed for standard 19" rack mounting and occupies 1U of rack
space. Avoid mounting the unit directly above power amplifiers or power supplies
that radiate significant amounts of heat and always connect the mains earth to the
unit. Fibre or plastic washers may be used to prevent the front panel becoming
marked by the mounting bolts.
AUDIO CONNECTIONS
INPUTS and OUTPUTS:
Both the input and output XLRs may be used either balanced or
unbalanced, the wiring convention being: pin 1 Ground, pin 2 Hot
and pin 3 Cold. The rear panel push buttons should be released
(out) for +4dBu operation or depressed (in) for -10dBV operation
in order to optimise the internal gain structure of the unit. For
use with unbalanced systems, the Cold pin (3) must be grounded
at both input and output XLRs.
Interference: If the unit is to be used where it maybe exposed to high levels of
disturbance such as found close to a TV or radio transmitter, we
advise that the unit is operated in a balanced configuration. The
screens of the signal cables should be connected to the chassis
connection on the XLR connector as opposed to connecting to
pin1. The DL441 conforms to the EMC standards.
Ground Loops: If ground loop problems are encountered, never disconnect the
mains earth, but instead, try disconnecting the signal screen on
one end of each of the cables connecting the outputs of the
DL441 to the patchbay. If such measures are necessary,
balanced operation is recommended.
POWER CONNECTION
The DL441 is supplied with a power cable suitable for domestic power outlets in your
country. For your own safety it is important that you use this cable to connect to the
mains supply earth. The cable should not be tampered with or modified.
If, for some reason, the unit is to be used at a mains input operating voltage which is
different to that as supplied, the following procedure must be carried out.
(see
following diagram, over page)