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Revision C • 12/05
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the output level of the built-in headphone amplifier. The room
monitor output is automatically muted whenever a Mic chan-
nel is On (typically channel 1 is set as a mic, but channels 2
and 3 can also be set as mics). The talent/board operator head-
phone jack is next to the Channel 1 controls on the rack ver-
sion. It is inset into the left side panel on the desktop version.
Logic
The 2-way talk interface has External Talk audio and logic
inputs, a Talent/board operator Mic Talk output and Talk Out
Tally. These allow the SMX
d to easily interface with any exist-
ing intercom system, or to function as its own talkback sys-
tem by adding an external audio switching relay.
There are three logic connectors on the rear panel:
•
12-pin AMP MOD IV:
Logic outputs for a warning
lamp interface, talk tally output and an external talk
logic input.
•
14-pin AMP MOD IV:
Logic inputs and outputs for
an optional cabinet-mount Mic Remote Panel
(PRE99-1197 or PRE99-1198) for channel 1 con-
trol from a remote talent mic location.
•
15-pin female D-Sub:
Ch. 2 - 7 start pulse outputs
and a timer reset command closure.
Overview of the Rack Mount model’s
Controls and Features
Stereo Bargraph Meter
(Displays average or
Average plus Peak)
Room Monitor
Output level
control
TRS Stereo Input
(alternate source
for Channel 4)
Talent
Headphones
level control
Channel controls (x7) with Bus
assign and Cue or Talk buttons, level
control & removable On/Off button lens
Meter, Monitor,
& Headphone
Source Selection
(
Desktop model’s controls are shown on the next page)
Power Supply
A separate “line lump” switching power supply, with three
regulated output voltages, is supplied with both versions of
SMX
d. The ±15 volt outputs power the analog circuitry, while
a +5 volt output powers the DSP and logic control circuits.
Talent
Headphones
Jack
Audio Routing
& Mixing DSP
Digital to Analog
Converters
Logic I/O
Stereo Bargraph Meter
MONO IN 1 *
AUX IN 4 STEREO
(Front Panel 1/4" TRS)
ANALOG IN 2L *
ANALOG IN 2R *
EXT. TALK
ANALOG IN 3L *
ANALOG IN 3R *
ANALOG IN 4L
ANALOG IN 4R
DIGITAL IN 5
DIGITAL IN 6
DIGITAL IN 7
EXT MONITOR IN L
EXT MONITOR IN R
EXT. TALLY LOGIC
(C/R Warning, Talk Tally,
Mic Panel Tallies, Start
Pulses, Timer Reset)
EXT. INPUT LOGIC
(Ext. Talk logic input,
Mic Panel Switches)
ROOM MONITOR OUT L
ROOM MONITOR OUT R
MIX MINUS OUT (DIGITAL)
MIX MINUS OUT (ANALOG)
PROGRAM 1 OUT L (ANALOG)
PROGRAM 1 OUT R (ANALOG
PROGRAM 1 OUT (DIGITAL)
TALKBACK OUT (ANALOG)
HEADPHONE AMP OUT L
HEADPHONE AMP OUT R
ANALOG AUDIO
DIGITAL AUDIO
LOGIC
PROGRAM 2 OUT L (ANALOG)
PROGRAM 2 OUT R (ANALOG
PROGRAM 2 OUT (DIGITAL)
* DIPSWITCH SET FOR MIC OR LINE FUNCTIONALITY
SRC: SAMPLE RATE CONVERSION
A/D: ANALOG TO DIGITAL CONVERSION
SMX
d
Block Diagram
