MOD 7a STEREO PROCESSOR
12
Digital Player Connections
The MOD 7a has six inputs (Left, Center, Right, Left Sur-
round, Right Surround and Sub) via a female DB25 connec-
tor marked
DIGITAL INTERFACE
. The
DIGITAL IN-
TERFACE
inputs accept any high level multi-channel
source. The audio signals are processed through the
equalizers and master volume circuit before they appear at
the main OUTPUTS. If EX mode is selected, then the Circle
Surround matrix processes the left surround and right
surround channels to produce the rear and overhead
channels.
SMART has interconnection cables available to connect the
popular digital player systems to the MOD 7a. Simply plug
the appropriate DB25 connector to the
MOD 7a DIGITAL
INTERFACE
port and the other DB25 connectors to the
audio and control ports on the digital player.
If you desire to make your own cables, here is the pinout
for the DB25 connector.
Digital Interface DB25 Pinout
Pin 1
Left
Pin 3
Center
Pin 5
Right
Pin 6
Left Surround
Pin 7
Right Surround
Pin 8
SubWoofer
Pin 9
Mono
Pin 10
Music
Pin 11
Stereo A
Pin 12
Digital
Pin 13
Stereo SR
Pin 14-25
Ground
Another application for the digital input is for external sync
sources. Sound interlock from a 35-mm reproducer or a
single 16-mm projector may be fed into the
DIGITAL
INTERFACE
and selected with the front panel
DIGITAL
format switch.
Default Optical Selection
External digital decoders available on the market have a
function that instructs the processor to switch to an optical
format in the event that the digital decoder fails or loses
time code. When this happens, the digital decoder will
pulse the appropriate terminal (MONO, STEREO A,
STEREO SR, or MUSIC) to ground to alert the processor to
switch to the optical format. The information pertaining to
which format to default to is encoded in the digital
soundtracks on DTS prints. On Dolby Digital, the default is
SR.
Monitor Interface
The
MONITOR INTERFACE
Port is a male DB25 connec-
tor to which a booth monitors processor inputs can be
connected. The pinout is as follows:
Pin 5
Right Rear/Overhead
Pin 7
Left Rear
Pin 12
+15 VDC
Pin 13
-15 VDC
Pin 15
Subwoofer
Pin 17
Right Wall
Pin 19
Left Wall
Pin 21
Right
Pin 23
Center
Pin 25
Left
Pins 2, 4, 6, 8,
10, 16, 18, 20,
22, & 24
Ground
Output Connections
The main OUTPUTS are labeled
LEFT
,
CENTER
,
RIGHT
,
LEFT WALL
,
LEFT REAR
,
RIGHT REAR
,
RIGHT WALL
,
SUB+
and
SUB-
. Shielded cable should be run between
these terminals and the next piece of equipment in the sound
system (equalizer, amplifer, etc.). Convenient
GROUND
terminals are provided near the outputs.
Output Wiring for non-EX applications
If you are not using the EX feature, then wire all surround
amplifiers to the
LEFT WALL
and
RIGHT WALL
termi-
nals. Do not use the
LEFT REAR
and
RIGHT REAR
terminals.
Output Wiring for EX applications
If you are using the EX feature, then wire the left wall and
right wall amplifiers to the
LEFT WALL
and
RIGHT
WALL
terminals. Wire the left rear and right rear amplifi-
ers to the
LEFT REAR
and
RIGHT REAR
terminals. Please
note: the CS/OS shunt must be in the
CS
position (see top
of Page 7 titled
EX Power Up and Overhead Channel
Configuration
)
Output Wiring for EX and Overhead Applications
If you are using the EX and overhead features, then wire
the left wall and right wall amplifiers to the
LEFT WALL
and
RIGHT WALL
terminals. Wire the left rear and right
rear amplifiers to the
LEFT REAR
terminal. Wire the
overhead amplifier to the
RIGHT REAR
terminal. Please
note: the CS/OS shunt must be in the
OS
position (see top
of Page 7 titled
EX Power Up and Overhead Channel
Configuration
) Also SW1-2 on the matrix must be set to the
DOWN position.
