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Page B-3
X-Rack EQ Module
B.3 Performance Specification
The following pages contain audio performance specification figures for the X-Rack 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.
B.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.
B.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
• Input 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
B.3.3 Performance
Signal applied to Input and measured at Output. EQ switched In. All EQ controls set centre as appropriate.
THD + N < 0.005% at +20dBu 1kHz
< 0.007% at +20dBu 10kHz
Frequency Response ±0.5dB from 20Hz to 20kHz
–3dB at 200kHz
Output Headroom > +26dBu at onset of clipping
Noise < –83dBu (+4dBu operating level)
< –92dBu (–10dBV operating level)
B.3.4 Curves
Each channel 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. High
and low pass filters are also available.
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 0.5 to 2.5 (may also vary with gain)