INPUT: The Input attenuator controls the signal level
to the input transformer. Use it to prevent overload of the transformer
and gain control tube. The optimum operating level is 0VU =+4dBu.
THRESHOLD: The Threshold control determines the amount
of gain reduction applied to the source material. Up to 12dB
of gain reduction is possible.
OUTPUT: The Output control is used to increase the
signal level after gain reduction. Up to +15dB of gain make-up
METER: The VU meter can indicate input level, output
level, or gain reduction. Input and output levels are referred
to 0VU = +4dBu. The trim for zero gain reduction is located below
the selector switch.
IN/BYPASS: 'Hard' bypass switches for comparing the
processed sound directly with the original source.
LINK/SPLIT: Links the two channels for stereo operation.
When linked, the Threshold and dynamics processing (fast, preset
and manual modes), and IN/BYPASS are controlled entirely by Channel
1. The Input and Output controls for the two channels should
be set to the same values.
MODE: Selects the three sidechain operating modes for
FAST: The 6386 and ES-8 gain control tubes are capable
of very fast operation.
In this mode, the attack and release times are 0.5ms and 50ms
Presets: These six attack/release time settings are
identical to the presets on the classic Fairchild 670 limiter.
Presets 5 and 6 are program-dependent.
Manual: The attack and release times are continuously
from 1-100ms and 0.1-2s respectively.
SIDECHAIN INSERTS: TRS 1/4" jacks for inserting
an outboard EQ into the sidechain. Use for frequency-dependent
compression or de-essing. Tip is send, and Ring is return. In
Link mode, both inserts are active.
INPUTS and OUTPUTS: The XLR and 1/4" connectors
for each channel are wired in parallel. Pin 2 (Tip) is positive
phase and Pin 3 (Ring) is negative phase. Input impedance is
10Kohms, transformer-balanced. Output impedance is 600 ohms,