Lexicon 300, Owner'S Manual

Page: 12 / 155

1-3
Installing the 300
DO
PUSH
L IN
MIDI
OUT
DO
IN
R IN
INPUT
GAIN
THRU
PUSH
L OUT R OUT
DI
DI
EIAJ CP340
PUSH
DI DO
PUSH
TIME CODE IN
AES/EBU
COMM PORT
MIDI Connectors
AC Power
Standard 3-pin IEC
power connector.
Communications
Port
DE9 connector, re-
served for future en-
hancements.
Input Gain
2-position (In/Out)
switch for matching in-
put gain to the source
being used.
In = +16dB; Out = 0dB.
Out
:
Transmits MIDI data to other equipment.
Thru
:
Passes any MIDI data received without
change.
In
:
Receives MIDI information from other MIDI
equipment such as master keyboard controllers,
MIDI foot controllers, sequencers and synthesiz-
ers.
The Rear Panel
3-pin XLR connectors, electronically balanced.
Either pin 2 or pin 3 can be used as high but, to
maintain polarity when transferring data to the
digital domain, pin 2 high convention is used by
Lexicon.
Pin 1 and either pin 2 or pin 3 of each output must
be grounded for unbalanced operation.
Input impedance is 50k
Ω
unbalanced, and
100k
Ω
balanced. Inputs accept input levels from
-14dBu to +20dBu.
Output impedance is 75
Ω
, and levels up to
+18dBu are possible.
Analog Inputs and Outputs
Inputs
Three connectors are provided for digital input:
AES/EBU professional format (1):
3-pin female XLR
S/PDIF EIAJ CP-340 consumer format (2):
unbalanced coaxial RCA
optical (fiber-optic)
One of these connectors may be selected for
digital input.
Outputs
Output format can be AES/EBU or S/PDIF.
Output always goes to all three digital outputs.
Digital interfaces conform to both the AES ANSI
S4.40-1985 spec and the EBU doc tech 3250.
Input/output impedance levels of the AES/EBU
connectors comply with the CCITT V.11 EIA-
422A specification.
Digital Inputs and Outputs
Time Code In
3-pin female XLR con-
nector for input of
SMPTE (Drop or Non-
drop), EBU, or FILM
time code formats.
(Electronically bal-
anced, 100mV p-p
minimum)