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Page E-1
X-Rack Line Return Module
E. The Line Return Module
E.1 Introduction
The X-Rack Line Return module is designed to operate in conjunction with the X-Rack XR622 Master
module to create an expandable, rack mounted, stereo line level mixer. The X-Rack Master module
provides the monitoring facilities that would be expected; mix amps, monitor outputs and a headphone
feed – please refer to the X-Rack Master module documentation for a full description.
E.2 Connection
The rear panel of the module carries a pair of 25-way ‘D’ connectors. The left-hand
connector provides four balanced Line Inputs whilst the right-hand connector
provides access to the Insert Send and Insert Returns for each of the four Line Inputs.
This module operates at a nominal level of +4dBu although the gain of each Line Input
or Insert Return can be varied by a front panel control.
E.3 Operation
The X-Rack Line Return module contains four separate input amplifiers, each
equipped with individual Gain and Pan controls as well as Insert, Solo and
Record/Mix bus switches.
The ‘LEVEL’ control allows the gain of each input to be varied from –∞ to +10dB
with an indent at unity gain. A signal present indicator measures the signal level
immediately prior to the ‘LEVEL’ control. It will light GREEN for signals above the
lower threshold of –60dBu, AMBER for signals between +4dBu and +24dBu and
lights RED for signals above +24dBu.
Signals applied to the input of the module will be permanently available on the
Insert Send; the Insert Return can be selected in place of the Line Input by pressing
the ‘INS’ switch . Note that the Insert Return can also be used to provide an
alternative input to each input amplifier.
Each input can be individually routed to either the Mix Bus (‘REC’ switch released)
or the Record Bus (‘REC’ switch pressed) . The ‘SOLO’ switch feeds signal, post
Level and Pan, to the X-Rack Solo Bus. Each of the three busses feed the X-Rack
Master Module, located either in the same X-Rack or remotely if multiple X-Rack
units have been linked by the ‘MIX BUS LINK’ connector (please note that X-Rack
units prior to serial number XRK0110 are not equipped with an ‘MIX BUS LINK’
connector).
The ‘PAN’ control will pan between Left and Right of the selected bus.
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SEL
XR623
LEVEL
PAN
INS
REC
SOLO
LINE 1
LEVEL
PAN
I
NS
R
EC
SOLO
LINE 2
LEVEL
PAN
INS
REC
SOLO
LINE 3
LEVEL
PAN
INS
REC
SOLO
LINE 4
LINE IN
INSERT
S
END/
RTN
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