4
DRAWMER
1968 O
PERATOR’S
M
ANUA
L
The 1968 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. Because the tube circuitry generates more
heat than an equivalent solid-state design, it is advisable
to leave space above the unit to allow the heat to dissipate.
INSTALLATION
AUDIO CONNECTIONS
The inputs and outputs are electronically balanced on conventionally wired XLRs (pin 1 screen, pin 2 hot, pin 3 cold and
XLR shell is connected to chassis). The operating level is nom4dBu. Balanced use is recommended.
• 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 oper-
ated in a balanced configuration. The screens of the
signal cables should be connected to the chassis con-
nection on the XLR connector as opposed to connect-
ing to pin1. The 1968 conforms to the EMC stand-
ards.
• Ground Loops:
If ground loop problems are encountered, never dis-
connect the mains earth, but instead, try disconnect-
ing the signal screen on one end of each of the cables
connecting the outputs of the 1968 to the patchbay. If
such measures are necessary, balanced operation is
recommended.
fig.1
1968 WIRING
The side chain feature on the 1968 is part of the compressor feedback stage and would normally be connected to a
normalised or semi-normalised pair of patchbay contacts. This would allow the user to insert additional EQ for some
de-essing, or frequency conscious compression. The side-chain access point is unbalanced, connection is via stereo
3" jacks, the wiring convention being: ring is signal send, tip is signal return and sleeve ground.
