LEXICON 20-20 AD (02) PDF MANUAL


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LEXICON 20-20 AD (02) PDF MANUAL

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LEXICON 20-20 AD (02) PDF MANUAL
20/20 AD qrg Rev 2
UNBAL THRESH
UNBAL THRESH
THRESH
UNBAL THRESH
UNBAL
DIGITAL COMP/LIMITER
POWER
OVL
OVL
DISPLAY
SCALE
1dB
DITHER
W*DE
100
0
0
ALT
RMT
6
mS
HF
3
3
-14
-18
6
6
4 ***N
EMPH
4
8
48
~
-22
-10
12
12
HOLD
FORMAT
PK
LINK
20BIT
PL DN
44.1
SPDIF
AES
LOCK
S*MPLE RATE
EXT SYNC
20/20 AD
18
18
2
10
1S
10
AES
24
24
20 BIT A/D CONVERTER
-6
-26
30
30
WC
12
0
36
36
0
M
ON
ATTEN
+
0
-36
+
M C P
PRES
AES / WC:
42
42
C
VID
MUTE
60
60
P
RELEASE
GAIN
THRESHOLD
2
4
3
1
Getting Started
Input Connections
Balanced
Un*al**c*d
Screen
pin
Screen and
Return
(Shield)
1
Positive
Positive
pin
2
Polarity
Polarity
Make sure the rear panel
BALANCE switches are set
to match the type of input.
(IN = unbalanced; OUT =
balanced) The red UNBAL
light will indicate an error if
there is a mismatch.
EXT SYNC allows you to syn-
chronize to an internally de-
r*ved sample clock, or to an
external AES or Word Clock
signal in the range of 41-
51kHz.
pin
Return
Open or
Return
3
ATTEN reduces input level by
6dB. Use sparingly, and only
on balanced input signals.
Note: Non-linearity of the poten-
tiometer can cause the signal to
become unbalanced when the
level knob is set to 11:30. To
corre*t *his, turn the knob slightly
in either direction until the UN-
BAL light goes out.
Note: The Word Clock input is
not transformer-isolated, and re-
quires a ground connection be-
tween the 20/20 AD and the sig-
nal source.
Dither types vary in spectral
d**t***ut**n of noise:
WIDE produces white noise
HF pr*duces noise whose
amplitude is lower than WIDE
at low frequencies, but higher
at high frequencies.
20 BIT has the same spectrum
as HF, but with lower ampli-
tude. Use this setting when
recording to 20-bit media.
Before switching between **te***l and External modes, be
sure to reduce monitor volume, as some D/A converters do
not mute when they lose lock.
Level Meters
When the compressor is
OFF, *he behavior of the level
meters is determined *y set-
tings of 1 dB SCALE and PK
HOLD.
Press 1dB SCALE to select
1dB scale on level meters.
Press PK HOLD to cause the
level meters to hold at the
highest level received.
When the compressor is ON, pressing DISPLAY will cause gain
reduction (in dB) to be displayed on the right t*o meters (2-
channel mode) or on all four meters (4-channel mode).
GAIN
NORMAL
1dB SCALE
REDUCTION
OVL
OVL
OVL
1
2
0
0
3
3
Meters 1 & 2
Meters 3 & 4
Switches *N
- red -
- red -
- yellow -
- yellow -
- green -
- green -
- green -
- green -
- green -
- green -
- green -
0
-3
-1
-6
4
-2
6
-12
-3
12
5
Normal
Normal
none
4-Channel
-18
6
-4
18
1 dB SCALE
1 dB Scale
1 dB Scale
Mode
-24
24
7
-5
Gain Reduction
Gain Reduction
DISPLAY
-30
8
-6
30
Normal
(Blank)
none
-36
9
36
-7
2-Channel
1 dB Scale
1 dB SCALE
Normal
-42
10
-8
42
Mode
-60
11
-9
60
Gain Reduction
DISPLAY
Normal
Alternate Modes
To activate
the alternate modes
ALT-ATTEN will mute the out-
puts. The level meters will still
work.
ALT-4 CHAN activates output
of a digital sinewave at the
AES ports.
In 4-channel mode, ALT-LINK
activates a synchronized short
tone burst.
press and hold
then
press one of these.
DISPLAY
1dB SCALE
RMT
ALT
MUTE
ATTEN
4 CHAN
DITHER
EXT SYNC
LINK
A*T-DISPLAY activates remote
mode/front panel lockout. When
activated, the 1dB SCALE and
DISPLAY LEDs flash and front
panel controls are locked into
their cu***nt settings.
ALT-DITHER activates psy-
choacoustically optimized
noise shaping. (Disables 4-
channel mode, compression
and mute functions.)
~
ON
ALT-EXT SYNC enables the
digital audio input.
Repeat to exit the alternate mode.
ALT-ON is reserved for *****e enhancements.
VID
© 1994
070-09091 Rev 2
20/20 AD Quick Reference Guide