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Page A-2
X-Rack Owner’s Manual
A.2.3 HF/LF Section
This section contains simple high and low pass filters as follows:
HF (Low Pass): Frequency range 50kHz – 3kHz (–3dB point)
Slope: 12dB/Octave
LF (High Pass): Frequency range 30Hz – 600Hz (–3dB point)
Slope: 18dB/Octave
The two filters can be switched into circuit independently.
A.2.4 OUTPUT Section
This small section contains a tri-colour signal present indicator and two routing
switches (‘REC L’ and ‘REC R’) which route the module signal onto a common
internal record bus.
The signal present indicator measures signals immediately prior to the output
amplifier. It will light GREEN for output signals above the lower threshold of
–60dBu, AMBER for signals between +4dBu and +24dBu and lights RED for signals
above +24dBu.
The record bus is not currently used but may be used by forthcoming X-Rack
modules (such as the XR622 Mix/Monitor Module, due late 2006).
4
SEL
XR621
MIC
INST
IMP
+48V
PAD
LINE
LINE
Ø
HF
IN
IN
IN
REC
REC
L
R
GND
LIFT
INSTRUMENT
OUTPUT
SIGNAL
LF
Z
LO HI
dB
+75 +12
+20 -20
dB
KHz
9 6
3 50
30 4
30 600
60
160 300
3
3
4