Solid State Logic XLOGIC SUPERANALOGUE X-RACK Stereo EQ User manual

Super-Analogue™ Outboard
X-Rack Stereo EQ User’s Guide
This documentation package contains the User’s Guide for your new X-Rack Stereo EQ
module. Depending on the age of your X-Rack, these pages may already be present in
your X-Rack Owner’s Manual – please check to see if these pages match your Manual.
f they do not, these pages should be filed alongside it.
Ple se Note. X-R ck units prior to seri l number XRK1450 (e rly 2011) fitted with multiple Stereo EQ
modules (gre ter th n three) m y require n up-r ted busc rd (SSL p rt no. 629620X2,
revision 2 or l ter) – ple se cont ct SSL if in doubt.
For correct oper tion of this module, your X-R ck unit must be running V1.4/8 or l ter
softw re. Ple se refer to your X-R ck Owners M nu l for instructions on how to check the
current softw re version nd how to obt in nd inst ll newer version if required.
There m y be newer version of the X-R ck Owner’s M nu l v il ble for downlo d from our
website (www.solidst telogic.com)
82S6XR0M0B
Solid State Logic
S O U N D || V I S I O N
SUPERANALOGUE
X - R A C K

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 N 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
221.5
105
2 15
7.6
32
15
Hz
KHz
2.0.2
1.0.6
.3 1.6
60040
220
60
IN
G-EQ
OUT
IN
+4dB
-10dB
LR
LR
1
2

Page M-2
X-Rack Owner’s Manual
M.3 Performance Specification
The following pages contain audio performance specification figures for the X-Rack Stereo EQ Module.
No other Solid State Logic products are covered by this document and the performance of other Solid State
Logic products can not be inferred from the data contained herein.
M.3.1 Measurement Conditions
For each set of figures on the following pages, the specific unit and test setup will be stated at the
beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed
beside the figures to which that difference applies.
M.3.2 Measurement References
Unless otherwise specified the references used in this specification are as follows:
• Reference frequency: 1kHz
• Reference level: 0dBu, where 0dBu ≈ 0.775V into any load
• Source impedance of Test Set: 50Ω
• nput impedance of Test Set: 100kΩ
• All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in
units of dBu
• All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are
expressed as a percentage
• The onset of clipping (for headroom measurements) should be taken as 1% THD
• Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%
• All measurements are made with the operating level switch set for +4dBu
M.3.3 Performance
Signal applied to nput and measured at Output. EQ switched n. All EQ controls set centre as appropriate.
THD + N < 0.007% at +20dBu 1kHz
< 0.007% at +20dBu 10kHz
Frequency Response ±0.5dB from 20Hz to 20kHz
–3dB at 90kHz
Output Headroom > +26dBu at onset of clipping (+4dBu operating level)
> +13.5dBV at onset of clipping (–10dBV operating level)
Noise < –70dBu (+4dBu operating level)
< –72dBV (–10dBV operating level)
M.3.4 Curves
The module contains a four band 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.
HF Band controls:
Frequency Variable from 1.5kHz to 22kHz
Gain Variable between ±20dB
‘Q’ 2.5 (on ‘ ’ setting)
HMF Band controls:
Frequency Variable from 600Hz to 7kHz
Gain Variable by > ±20dB
‘Q’ Variable from 0.7 to 2.5 (may also vary with gain)

Page M-3
X-Rack Stereo EQ Module
LMF Band controls:
Frequency Variable from 200Hz to 2.0kHz
Gain Variable by > ±20dB
‘Q’ Variable from 0.7 to 2.5 (may also vary with gain)
LF Band controls:
Frequency Variable from 40Hz to 600Hz
Gain Variable between ±20dB
‘Q’ 2.5 (on ‘ ’ setting)
The LF and HF bands have variable turnover frequency with switchable bell/shelving and selectable
response curves:
• Normal (‘E type’) curves – with the ‘G-EQ’
(‘ ’) switch OUT – follow conventional cut
or boost characteristics.
• The ‘G type’ curves – with the ‘G-EQ’ (‘ ’)
switch N – have a modified slope which
provides a degree of overshoot/undershoot
for increased selectivity.
The two parametric bands have selectable characteristics which affect the relationship between frequency
bandwidth and gain:
• With the ‘G-EQ’ (‘ ’) switch OUT, the
frequency bandwidth is constant at all gains.
• When the ‘G-EQ’ (‘ ’) is switched N, the
frequency bandwidth will reduce with
increased gain, thereby increasing the
selectivity of the EQ as the gain is increased.
• At full boost or cut both are identical.
10 100 1k 10k 20k
-25.0
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
20.0
25.0
Amplitude (dBr) v Frequency (Hz)Channel Equaliser Curves
'G type'
'E type'
Both
0.0
25.0
-25.0
20 100 1k 10k 100k
-20.0
-15.0
-10.0
-5.0
5.0
10.0
15.0
20.0
Amplitude (dBr) v Frequency (Hz)Channel Equaliser Curves
'G type"
'E type'

Page M-4
X-Rack Owner’s Manual
M.4 Calibration Information
The X-Rack Stereo EQ module requires no calibration.
M.5 Connector Details
M.6 P ysical Specification
Depth: 200mm / 7.9 inches including front p nel knobs, excluding connectors
275mm / 10.9 inches including front p nel knobs nd connectors
Height: 171mm / 6.75 inches
Width: 35mm / 1.4 inches front/re r p nels
49mm / 1.9 inches over ll width (front nd re r p nels re offset)
Weight: 260g / 9.5 ounces
Boxed size: 190mm x 290mm x 70mm / 7.5" x 11.5" x 2.5"
Boxed weight: 460g / 16.5 ounces
* All v lues re pproxim te
M.7 Environmental Specification
As per X-R ck – see p ge 19.
Audio Output
Location: Rear Panel
Conn’ Type: Stereo 1/4" Jack Socket
Pin Description
Tip Audio +ve
Ring Audio –ve
Sleeve Chassis
Audio Input
Location: Rear Panel
Conn’ Type: Stereo 1/4" Jack Socket
Pin Description
Tip Audio +ve
Ring Audio –ve
Sleeve Chassis