Solid State Logic SSL G Series - Operation

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Operation
Please refer to the front panel illustration
The main VCA is permanently in circuit; the compressor sidechain
is enabled by the IN switch. The other sidechain controls are
equally straight forward and hopefully require little explanation.
The ATTACK, RATIO and RELEASE controls are multi-position
switches; the THRESHOLD and MAKE-UP controls are
continuously variable potentiometers.
It should be noted that the knee point of the compressor, set with
the THRESHOLD control, purposely changes depending on the
setting of the RATIO control. Decreasing the RATIO setting lowers
the effective threshold, hence maintaining the perceived ‘loudness’
of the compressed signal.
The compressor features a classic ‘dominant’ sidechain
architecture. The left and right channels are independently rectied
using a true peak full wave detector circuit, and the dominant, ie.
louder channel, controls the gain reduction of the overall stereo
level via the user selected time constants. The compressor now
features an HPF (High Pass Filter) in the sidechain, which is
controlled by a multi-position switch.
The illuminated compression meter at the top of the module
displays gain reduction for the compressor.