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20/20 AD User Guide
Digital Audio
Inputs and Outputs
AES, S/PDIF: XLR, 3-wire balanced
RCA, 2-wire
unbalanced coaxial line
Optical, optical fiber
Word Clock: BNC, 75Ω, unbalanced
Front Panel Controls
Converter Gain (4)
1dB SCALE/ALT
PK HOLD
ATTEN/MUTE
4 CHAN/~
EMPH
DISPLAY/RMT
LINK/ tone burst
ON/VID
Compressor Gain
Compressor Threshold
Compressor Release
DITHER (3 types, and OFF)
FORMAT
SAMPLE RATE (2)
EXT SYNC (2 types, and none)
POWER
Rear Panel Controls
BAL/UNBAL switch
Front Panel Indicators
UNBAL
THRESH
Input level
Dither selection
Format selection
Sample Rate selection
External source selection,
presence and lock
Button lights indicate:
1dB SCALE on
PK HOLD on
ATTEN on
4-CHAN on
EMPH on
DISPLAY on
LINK on
COMP/LIMITER on
Signal Delay
112 samples
(2.54 ms at 44.1kHz
2.33 ms at 48kHz)
RFI Shielding
Complies with FCC Rules Part 15
Class A requirements for computer
equipment
Power Requirements
100/120/220/240 VAC (+5%, -10%)
50-60 Hz 30W
Dimensions
19.0"W x 1.75"H x 13.9"D
(483 x 45 x 353mm)
Conforms to 19" rack mount
standard, 1U high
Weight
11 lbs 2 oz (5 kg)
Shipping materials meet or exceed Proj-
ect 1A of the National Safe Transit Asso-
ciation (NSTA) packaged-product
specifications: vibration test, drop test,
static compression test.
Environment
Operating Temperature: 32° to
95°F (0° to 35° C)
Storage Temperature: -22° to 167°F
(-30° to 75°C)
Humidity: 95% maximum without
condensation
Safety Approvals
UL, TUV
Frequency Response
(relative to 1kHz)
+0.1, -0.15dB, 10Hz to -20 kHz
MAX Input Level
Balanced:
Attenuator Off: +0 to +22 dBu
Attenuator On: +8 to +28 dBu
Unbalanced:
Attenuator Off: -6 to +16 dBu
(-8 to +14 dBV)
Dynamic Range
4-channel mode:
100dB typ,
98dB min @ 1kHz
2-channel mode:
112dB typ,
110dB min @ 1kHz
THD+N (at -2dBfs)
1kHz: <-94dB (0.002%)
20 Hz-20 kHz: <-90dB (0.0032%)
CMRR
Attenuator Off:
>60dB below 1kHz,
>40dB above 1kHz
Attenuator On: >40dB
Crosstalk
-80dB typ, 0-20kHz
Sample Rates
44.1 kHz, 48 kHz
Sync Sources
Internal
External AES (Digital Input*)
External Word Clock
(TTL level square wave)
Video (with optional daughter-
board)
Lock Range
+5%
Specifications subject to change without notice.
Specifications
*Units with Serial #'s <1215 do not have
this option installed. Upgrades are avail-
able from Lexicon.