422
9
SpecificationsChapter 6
Note The maximum operating ambient temperature is
25 degrees C.
The Automatic Gain Controller (AGC-Leveler) shall be a stereo model that reduces the dynamic
range of wide range, wideband audio signals and provides peak limiting. The AGC shall occupy
one rack space (1U).
The AGC-Leveler shall be capable of controlling audio signals ranging from -70dBu to +24dBu
and reducing their range by an input/output ratio of from 1:1 to 5:1. A target output level control
shall be provided to shift the level of the output signal over a nominal ±20 dB range. The release
time of the AGC shall be controlled by the presence and nature of input signals.
The AGC-Leveler shall also contain an integral peak limiter having at least a 15:1 ratio and
adjustable threshold level. A green LED indicator shall be provided to indicate peak limiter
activity. The peak limiter threshold shall determine the absolute maximum output amplitude of the
AGC-Leveler regardless of other conditions.
The AGC-Leveler shall provide identical peak responding input and output level meters. These
meters shall be capable of responding to signals ranging from -48VU to +12VU (-50dBu to
+16dBu). An output clipping indicator shall be provided.
The inputs shall be active balanced bridging designs terminated with 3-pin XLR (AES/IEC
standard wiring) female and 1/4" (tip-ring-sleeve) jacks.
The outputs shall be active balanced designs terminated with 3-pin XLR (AES/IEC standard
wiring) male and 1/4"(tip-ring-sleeve) jacks.
Overall frequency response shall be 20Hz to 20kHz, ±1dB, measured at +4dBv output. There shall
be no more than 0.02% harmonic distortion measured under the following conditions: +4dBu
input, +4dBm output, BYPASS switch out, 1000Hz test frequency. Residual noise output shall be no
greater than -90dBu measured in a 20kHz noise bandwidth with an rms responding meter.
When the unit is inoperative (either by loss of power, or via the BYPASS switch), the inputs and
outputs shall be wired together. A REMOTE BYPASS facility shall be provided whereby an external
contact closure shall force the AGC-Leveler into BYPASS mode.
The AGC-Leveler shall be capable of operating by means of its own built-in power supply con-
nected to 117V nominal AC (105 to 130V) 50/60 Hz and 230V nominal AC (207 to 253V AC).
The AGC-Leveler shall be a Symetrix, Incorporated model 422 Stereo AGC-Leveler.
422 Architects and Engineers Specifications
Input/Output
Inputs Stereo, Balanced Bridging or Unbalanced
Outputs Stereo, Balanced or Unbalanced
Input Connectors 1/4" TRS, XLR and RCA
Output Connectors 1/4" TRS, XLR and RCA
Polarity Input: tip is high, ring is low, sleeve is ground
Output: tip is high, ring is low, sleeve is ground
Maximum Input Level +24 dBu
Maximum Output Level +22 dBu into 600 Ohms
Performance Data
Frequency Response 0 dB ±1 dB, 20 Hz - 20 kHz
THD+Noise .05%, 0 dBu in, 10 dB gain reduction, 1 kHz
Dynamic Range >110 dB
Crosstalk -60 dB, +20 dBu in, 20 Hz - 20 kHz
AGC Detector Range -70 dBu to 0 dBu
Ratio 1:1 to 5:1
Target Level Range 30 dB
Limiter Threshold -15 dBu to +25 dBu
Limiter Ratio >15:1
Input Common Mode Rejection 40 dB @ 1 kHz
Output Noise -90 dBu, broadband
Physical
Size (hwd) 1.72 x 19 x 5.5 inches, 4.37 x 48.26 x 13.97 centimeters
Shipping Weight 8 lbs (3.63kg)
Electrical
Power Requirements 117V nominal, 105 to 130V AC,
50 to 60 Hz, 12 watts
230V nominal, 207 to 255V AC, 50 Hz, 12 watts
422 Specifications
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