Drawmer 1968 Dual Ch Tube Compressor - Manual (Page 4)

4 DRAWMER 1968 MkII O PERATOR’S M ANUA L
The 1968 MkII 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 nominally +4dBu. 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 MkII 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 MkII to the
patchbay. If such measures are necessary, balanced
operation is recommended.
fig.1 1968 MkII WIRING
The side chain feature on the 1968 MkII 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
1/4" jacks, the wiring convention being: ring is signal send, tip is signal return and sleeve ground.