Solid State Logic BiG SiX User Manual

BiG SiX User Guide
Console Overview
19
G-Series Bus Compressor
The G Series Bus Comp in BiG SiX is a stereo compressor applied across the Main Mix bus, using exactly the same circuit topology
as the original design found on the SL4000 G-Series console released in 1989 (which in-turn was
evolved from the earlier E-Series consoles).
The T/HOLD pot adjusts the Threshold for the compressor, with ve LEDs indicating the amount
of gain reduction applied (-1, -3, -6, -9, -15 dB). The compressor uses the 4:1 ratio, 30 ms attack
and 100 ms release settings from the original processor which are preferred settings for many
SSL large format console users. BiG SiX also features a selectable AUTO RELEASE switch. This
changes the 100 ms release setting and uses the same dual rate Auto Release characteristic as
the original G-Series Bus Compressor, which is another popular setting option from the larger
consoles for some users. The dual release time constant Auto Release circuit automatically increases the release time once the
compression acts over a longer time period. This results in shorter release times after short transient compression and longer
release times from more continuous compression action. Auto Release can result in longer release times depending on signal
content which may appear as if the LED meters are 'stuck on', however this is normal behaviour. Adjustable MAKE UP gain and a
bypass ‘IN’ switch allow level matching and switching for direct comparisons of the clean and processed signals.
The bus compressor side chain also has a 1st order High Pass Filter at approx 50 Hz, a feature of more modern SSL bus
compressor designs to give smoother performance from mixes with prominent bass content.
Main Bus Block Diagram
EXT 1
EXT 2
BUS B
OUT
+
-
S/C
VCA
VCA
S/C
VCA
VCA
L R
L R
L R
MIX AFL
L R
MAIN
BUS B
+
-
+
-
SEND
RETURN
+
-
+
-
SEND
RETURN
IN
+
-
MUTE
LEVEL
+
-
L
to +10dB
+
-
R
BUS COMP to
∑ ST CUE 1
T/HOLD
INSERT
MAIN
OUT
MAKE UP
USB
SEND
15/16
USB
SEND
13/14
AUTO
RLS
L
R
SUM IP
TO MAIN
G SERIES BUS COMP
L
R
FROM
EXT 1
FROM
EXT 2
BUS B
TO MON
FROM
ST CUE 1
MAIN BUS
TO MON

Solid State Logic BiG SiX Specifications

General

Brand	Solid State Logic
Model	BiG SiX
Category	Music Mixer
Language	English