Page M-1
X-Rack Stereo EQ Module
M. Stereo EQ Module
M.1 Connection
The module input and output gains can be set to operate at a nominal level of either
+4dBu or –10dBV, using a switch on the connector panel. To select the appropriate
level for the equipment you are connecting to, please check the operating manual for
your mixer or DAW. The switch should be released for +4dBu operation: push it in for
–10dBV operation.
M.2 Operation
The X-Rack Stereo EQ module is a 4-band stereo equaliser that can be switched
between two different sets of curves, one based on the latest version of the classic
SSL E Series EQ and the other based on SSL’s G Series EQ.
The two G-EQ buttons
independently switch the HF/LF (‘
’ button) and
HMF/LMF (‘
’ button) bands from ‘E’ operation to ‘G’ operation.
The IN button
switches the entire section in and out of circuit.
M.2.1 Frequency Sections
The different frequency sections are as follows:
HF Section:
Frequency range 1.5kHz – 22kHz
Gain ±20dB
LF Section:
Frequency range 40Hz – 600Hz
Gain ±20dB
The HF/LF sections provide shelving equalisers with variable turnover frequency
and a gentle slope. Selecting the ‘G-EQ’ (‘
’) button provides a slightly steeper
slope for both sections with a degree of overshoot/undershoot (depending on
whether you are boosting or cutting) below the selected HF frequency (or above the
selected LF frequency). Selecting ‘
’ (‘Bell’) in either mode switches the equaliser
to a peaking curve.
HMF Section:
Centre frequency 600Hz – 7kHz
Gain ±20dB
Continuously variable Q (0.7 – 2.5)
LMF Section:
Centre frequency 200Hz to 2.0kHz
Gain ±20dB
Continuously variable Q (0.7 – 2.5)
Normally, the bandwidth of the HMF and LMF sections will remain constant at all
gains – at lower gains the EQ curves are comparatively narrower for a given Q setting. This is particularly
useful for drums since relatively high Q is available at low gain settings but is less suitable for overall EQ
or subtle corrections because the Q must be adjusted to maintain the same effect as the gain is changed.
When the HMF/LMF band is switched to ‘G-EQ’ (‘
’) operation, the bandwidth will vary with gain so
an increase in boost or cut increases the selectivity of the EQ. This type of EQ can sound most effective
when used at moderate settings; the gentle Q curve lends itself to the application of overall EQ on
combined sources and subtle corrective adjustments to instruments and vocals.
2
1
SEL
XR727
HF
dB
HMF
LMF
dB
dB
LF
dB
Q
Q
-
+
-
+
-
+
-
+
G-EQ
KHz
KHz
22
1.5
10
5
2
15
7
.6
3
2
1
5
Hz
KHz
2.0
.2
1.0
.6
.3
1.6
600
40
220
60
IN
G-EQ
OUT
IN
+4dB
-10dB
L
R
L
R
1
2
Summary of Contents for XLOGIC SUPERANALOGUE X-RACK Stereo EQ
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