User manual LEXICON 20 QUICK REFERENCE GUIDE REV 1

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Manual abstract: user guide LEXICON 20QUICK REFERENCE GUIDE REV 1

Detailed instructions for use are in the User's Guide.

 [. . . ] 20/20 AD Quick Reference Guide
UNBAL THRESH

1

OVL 0 3 6 12 18 24 30 36 42 60

UNBAL

THRESH

1dB SCALE PK HOLD ATTEN

UNBAL

THRESH

ALT

MUTE

2

3

M C P

OVL 0 3 6 12 18 24 30 36 42 60

UNBAL

THRESH

DISPLAY

DIGITAL COMP/LIMITER
6 4 8 10 -26 -6 -36 0 0 + 0 12
M C P

~
+ · ­

4 CHAN EMPH

RMT

-18 -22

-14 -10 10

100 mS 1S ·­

DITHER FORMAT

LINK
2

ON
VID

AES / WC:

WIDE HF 48 AES WC PRES

20BIT PL DN 44. 1 SPDIF AES LOCK

POWER SAMPLE RATE

20/20 AD
EXT SYNC
20 BIT A/D CONVERTER

4

GAIN

THRESHOLD

RELEASE

Getting Started
Input Connections
Balanced pin 1 pin 2 pin 3 Screen (Shield) Positive Polarity Return Unbalanced Screen and Return Positive Polarity Open or Return

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 synchronize to an internally derived sample clock,  or to an external AES or Word Clock signal in the range of 4151kHz. 

Dither types vary in spectral distribution of noise: WIDE produces white noise HF produces noise whose amplitude is lower than WIDE at low frequencies,  but higher at high frequencies.  [. . . ] When the compressor is ON,  pressing DISPLAY will cause gain reduction (in dB) to be displayed on the right two meters (2channel mode) or on all four meters (4-channel mode). 
NORMAL OVL 0 3 6 12 18 24 30 36 42 60 - red - red - yellow - yellow - green - green - green - green - green - green - green OVL 0 -3 -6 -12 -18 -24 -30 -36 -42 -60 1dB SCALE OVL 0 -1 -2 -3 -4 -5 -6 -7 -8 -9
GAIN REDUCTION 1 2 3 4 5 6 7 8 9 10 11

Switches ON
4-Channel Mode 2-Channel Mode none 1 dB SCALE DISPLAY

Meters 1 & 2
Normal 1 dB Scale Gain Reduction

Meters 3 & 4
Normal 1 dB Scale Gain Reduction (Blank) 1 dB Scale Gain Reduction

none 1 dB SCALE DISPLAY

Normal Normal Normal

Alternate Modes
To activate the alternate modes. . . press and hold
ALT-ATTEN will mute the outputs. ALT-4 CHAN activates output of a digital sinewave at the AES ports. ALT-DISPLAY activates remote mode/front panel lockout. When activated,  the 1dB SCALE and DISPLAY LEDs flash and front panel controls are locked into their current settings. In 4-channel mode,  ALT-LINK activates a synchronized short tone burst. ALT-ON is reserved for future enhancements. ALT-DITHER activates psychoacoustically optimized noise shaping. (Disables 4channel mode,  compression and mute functions. )
070-09091 Rev 1

. . . then press one of these. 

1dB SCALE
ALT

MUTE

Repeat to exit the alternate mode. 
© 1993

ATTEN
RMT

DISPLAY LINK ON
VID

DITHER

~

4 CHAN

20/20 AD Quick Reference Guide
3+4 DO 1+2 DO
PUSH

AES SYNC IN

WORD CLOCK IN OUT

PUSH

4

IN

3 UNBAL BAL

PUSH

PUSH

2

IN

1 UNBAL BAL

PUSH

V~

Using the Compressor
GAIN 0dB -3dB -6dB -8dB 1 1. 50:1 1. 20:1 1. 14:1 1. 11:1 1. 09:1 1. 07:1 1. 06:1 1. 06:1 1. 05:1 1. 05:1 1. 04:1 1. 04:1 1. 03:1 1. 02:1 2 3. 00:1 1. 50:1 1. 33:1 1. 25:1 1. 20:1 1. 16:1 1. 14:1 1. 12:1 1. 11:1 1. 10:1 1. 09:1 1. 08:1 1. 07:1 1. 06:1 3 4. 00:1 2. 00:1 1. 66:1 1. 42:1 1. 33:1 1. 27:1 1. 23:1 1. 20:1 1. 17:1 1. 16:1 1. 14:1 1. 13:1 1. 11:1 1. 09:1 4 4. 00:1 3. 00:1 2. 00:1 1. 66:1 1. 50:1 1. 40:1 1. 33:1 1. 28:1 1. 25:1 1. 22:1 1. 20:1 1. 18:1 1. 15:1 1. 12:1 5 4. 00:1 4. 00:1 2. 66:1 2. 00:1 1. 71:1 1. 55:1 1. 45:1 1. 38:1 1. 33:1 1. 29:1 1. 26:1 1. 23:1 1. 20:1 1. 16:1 6 4. 00:1 4. 00:1 4. 00:1 2. 50:1 2. 00:1 1. 75:1 1. 60:1 1. 50:1 1. 42:1 1. 37:1 1. 33:1 1. 30:1 1. 25:1 1. 20:1 7 4. 00:1 4. 00:1 4. 00:1 3. 33:1 2. 40:1 2. 00:1 1. 77:1 1. 63:1 1. 53:1 1. 46:1 1. 41:1 1. 36:1 1. 30:1 1. 24:1 8 4. 00:1 4. 00:1 4. 00:1 4. 00:1 3. 00:1 2. 33:1 2. 00:1 1. 80:1 1. 66:1 1. 57:1 1. 50:1 1. 44:1 1. 36:1 1. 28:1 9 4. 00:1 4. 00:1 4. 00:1 4. 00:1 4. 00:1 2. 81:1 2. 28:1 2. 00:1 1. 81:1 1. 69:1 1. 60:1 1. 52:1 1. 42:1 1. 33:1 10 4. 00:1 4. 00:1 4. 00:1 4. 00:1 4. 00:1 3. 50:1 2. 66:1 2. 25:1 2. 00:1 1. 83:1 1. 71:1 1. 62:1 1. 50:1 1. 38:1 11 4. 00:1 4. 00:1 4. 00:1 4. 00:1 4. 00:1 4. 00:1 3. 20:1 2. 57:1 2. 22:1 2. 00:1 1. 84:1 1. 73:1 1. 57:1 1. 44:1 12 4. 00:1 4. 00:1 4. 00:1 4. 00:1 4. 00:1 4. 00:1 4. 00:1 3. 00:1 2. 50:1 2. 20:1 2. 00:1 1. 85:1 1. 66:1 1. 50:1

THRESHOLD

-10dB -12dB -14dB -16dB -18dB -20dB -22dB -24dB -26dB -30dB -36dB

To minimize the audibility of compression artifacts,  use ratios from the unshaded portion of the table. 

Dynamic Range Compression
Start with compressor GAIN set between 4 and 6dB. Shorten the time constant for percussive program material and lengthen it for voice. Start with RELEASE set to 100mS and adjust it for the program material

Overload Protection
Press PK HOLD and 1dB SCALE. Set input so that peaks read approximately -4dB.  [. . . ] Connect the appropriate sync source or use EXT SYNC to select Internal Sync (neither WC nor AES lighted). AES sync source must be within 41-51 kHz range. 

3 Oak Park · Bedford,  MA 01730 USA · Tel 781-280-0300 · Fax 781-280-0499 [. . . ]

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