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Channel EQ
The EQ on the SiX Channel module is the same design as found in
the SiX Console which has its roots in SSL’s classic E series EQ. It
is a gentle, broad stroke two-band design with high and low shelving
filters at 3.5 kHz and 60 Hz, adjustable from +15 dB to -15 dB of gain.
Each band can be independently switched between shelving and bell
curves using the BELL switch - a feature found on many SSL EQ
designs. A useful feature of the bell curves is that they change centre
frequency to operate at 5 kHz and 200 Hz giving greater versatility
from the two controls.
The EQ is switched ‘in’ circuit or completely bypassed using the ‘IN’
switch. This guarantees no influence on the channel’s flat frequency
response from the tolerance of the EQ control centre detent positions.
COMP (Compressor)
The ‘one knob’ channel compressor on the SiX Channel module
is responsive design with features that give powerful and versatile
performance from its deceptively simple controls.
The attack time of the compressor is approximately 5 ms and has
an over-easy/soft knee response. This allows the compressor to
operate smoothly with a wide variety of content. The release time is
approximately 300 ms and the ratio is 2:1. The single user control
is for the compressor Threshold and is adjustable b10
and -20 dBu with a three LED meter indicating the amount of gain
reduction being applied. The circuit has automatic make-up gain to
maintain signal level for the full range of threshold settings.
As with the EQ circuit, the compressor can be completely bypassed
using the IN switch, for a simple way to compare the compressed
and uncompressed signals. This also prevents component toler-
ances from influencing the sound of the channel strip when the
Threshold is turned to minimum.
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