Symetrix 422 - Front & Rear Panel Overview; Front Panel Controls (Left Side); Front Panel Controls (Right Side)

422
3
Chapter 3
Front view (left side)
DETECTOR - Establishes an audio reference for the purpose of discriminating between noise and
useful audio. The 422 will not attempt to apply leveling (upward gain increases) to signals that fall
below the detector threshold.
RATIO control - Sets the amount of downward compression for signals exceeding the target level
as well as the amount of upward leveling for signals below the target level.
TARGET LEVEL control - Establishes a nominal gain goal. For signals below the target level the
422 adds gain and boosts them upward. Signals above the target level are reduced in gain (down-
ward towards the target).
PEAK LIMIT control - Determines the level at which peak limiting gain reduction begins. Signals
exceeding this threshold will be reduced by a ratio of approximately 15:1 (an increase of 15dB at
the input results in only 1 dB increase at the output).
BYPASS/IN button - Activates relays which route the 422 input signals directly from the input
connectors to the output connectors when in the BYPASS position.
INPUT/OUTPUT LEDs - Indicate the higher of either left or right channel calibrated in VU (volume
units). ( 0 VU=+4dBu).
Front view (right)
Front & Rear Panel Overview
TARGET LEVELRATIODETECTOR
AGC/LEVELER
422
STEREO
THRESHOLD (Vu) INPUT : OUTPUT OUTPUT LEVEL
2.5 : 1
INCREASE
5 : 1
DECREASE
BYPASS
-20
-45
LI
M
OUTPUT LEVEL
+12 +6 0VU-6 -12 -18 -24 -30 -36 -42 -48 -54
0VU +6 +12 -24 -18 -12 -6 -30 -36 -42 -48 -54
INPUT LEVEL
CLIP
BYP
SYSTEMPEAK LIMIT
THRESHOLD (Vu)
+15
BYPASS
+5
-5
-15
LIMIT
IN
IN
BYPASS
BYPASS