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X-Rack Master Module
F. Master Module
F.1 Introduction
Used in conjunction with the XR623 X-Rack Line Return module, the XR622 X-Rack Master module
provides a complete small scale mix and monitor system for studios seeking a compactsolution for mixing
and monitoring in the analogue domain. Asingle X-Rack can provide up to 28 line level inputs. Additional
racks can be connected via the ‘MIX BUS LINK’ connector on the rear of the X-Rack unit, allowing
additional inputs to be added to the system if required.
X-Rack units prior to serial number XRK0110 are not equipped with a ‘MIX BUS LINK’ connector.
The X-Rack Total Recall system allows session setups to be recalled instantly and can be archived as a
MIDI SysEx dump to any MIDI sequencer. The monitor section controls can also be controlled remotely
using MIDI controller commands from any MIDI controller. Up to three racks can be connected to an
AWS 900 orAWS 900+ and integrated with theAWS 900 Total Recall system via the serial port. Connecting
the MIX and REC outputs of the XR622 to the MIX and REC Insert Returns of the AWS 900 and selecting
INSERT SUM mode allows almost unlimited expansion of the number of line level inputs to the console.
F.2 Connection
The rear panel of the module carries a pair of 25-way ‘D’ connectors. The left-hand
connector provides the main and alternate Monitor outputs as well as a stereo External
Input and the Mix Bus Insert Return. The right-hand connector provides Mix and
Record Bus outputs along with the Mix Bus Insert Send and a Follow-Monitor (pre-
level control) output.
All outputs (apart from the headphone output) operate at a nominal level of +4dBu
and are configured to drive standard line level inputs. Level compensation for feeding
600Ω inputs from the Bus, Insert and Monitor outputs is provided by removable
jumpers – refer to Section F.3.4 for details.
F.3 Operation
As well as a compact stereo monitor section, the X-Rack Master module contains the
mix amps and outputs for the X-Rack’s internal Mix, Record and Solo/AFL busses.
The Mix bus is intended to be used as the main mix bus and includes a balanced
insert point immediately before the Mix level control. The Record bus provides a
direct path to a DAW (or any other recorder), allowing the Mix bus to be used to
provide a monitor mix while recording one or more inputs via the Record bus.
If the X-Rack is fitted with XR621 Mic Amp modules these can be routed directly to
the Record bus using the ‘REC L’ and ‘REC R’ switches on the XR621 module.
F.3.1 Mix Section
This section carries all of the Mix bus controls; the ‘MIX LEVEL’ control allows the
overall gain of the Mix bus to be adjusted (the Record bus level is fixed).
The ‘INS’ switch brings the Mix Bus Insert Return into circuit (the Insert Send is
permanently active) whilst the ‘SUM REC’ and ‘INS SUM’ switches allow the
Record bus and Insert Return to be summed with the Mix bus to allow for summing
of additional mix sources.
The ‘MON’ switch enables the Mix output to be replaced with whichever source(s)
have been selected for the Monitor section.
1
SEL
XR622
MIX LEVEL
AFL
LEVEL
MIX
REC
MONITOR
SUM
MON
SUM
INS
INS
REC
MIX
EXT
ALT
MONO
SOLO
DIM
CUT
MONITOR
0
3
6
9
12
15
18
24
30
36
4
2
48
INS RTN
EXT
M
ON
ALT MON
INS SND
MIX
R
EC
FOL MON
1