DL221 OPERATORS MANUAL
3
INSTALLATION
The DL221 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. 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. For use with unbalanced systems,
the Cold pin (3) must be grounded at both input and output
XLRs.
If earth loop hum problems are encountered, don't
disconnect the mains earth but instead, try disconnecting the
signal screen on the cables connecting the DL221 to the
patchbay. If such measures are necessary, balanced
operation is recommended.
S/C INSERT:
The side-chain insert point is configured as a stereo jack
socket wired tip return, ring send. This point is unbalanced
and would normally be connected to a normalised or semi-
normalised pair of patchbay contacts.
If earth loop problems are encountered, do not disconnect
the mains earth but instead, try disconnecting the output
signal screen at one end of the cables connecting the DL221
to the patchbay. If such measures are necessary, balanced
operation is recommended.
POWER CONNECTION
The unit will have been 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. The unit
should always be connected to the mains supply earth using this cable
