14
MODIIC STEREO PROCESSOR
dBC spl from the subwoofer. The installer may wish to
adjust for another level, depending on the amount of
subwoofer desired. Turn the Left and Right channel
amplifiers back on.
An alternative procedure is to turn on the LEFT and
RIGHT pink noise switches and adjust the SUB LEVEL
on the Output Card to “level out” the lower end fre-
quencies as viewed on an RTA set up in the auditori-
um. Do not turn off the Left and Right channel ampli-
fiers for the alternative method.
Plug the MATRIX Card back into its slot.
OPTIONAL 3-D MONO FUNCTION:
No adjustments are necessary for units equipped with
the optional 3-D Mono/Backup Card.
MUSIC LEVELS:
Set the MUSIC LEVEL control, located behind the
front panel on the right side of the Format Card, two-
thirds up from its counterclockwise position . Select
Music mode and turn on the music source that is feed-
ing the MODIIC. Turn the left and right music level
trimpots on the Output/Music Card to obtain a nor-
mal house level. These trimpots are factory set and
may not need adjustment. DO NOT TURN THESE UP
TOO HIGH as music-to-film crosstalk may occur.
Adjust the trimpots so that right and left music are set
to the same level. A way to accomplish this is to play a
stereo music selection with a good vocal track and
adjust either the left or right music trimpots for mini-
mum vocals in the surround channel.
The music circuit in the MODIIC has a simple matrix
which generates four channels of music from any 2-
channel stereo music source.
TIME DELAY:
Locate the 325 DIGITAL TIME
DELAY Card. The bottom of this
card has a rotary switch. Each
position clockwise on the rotary
switch equals 10 mSec (millisec-
onds) of delay. Position 0 is the
minimum delay setting which
equals 10 mSec of delay. Position
1 produces a total of 20 mSec of
delay, position 2, 30 mSec, etc.
The maximum amount of delay
possible is 160 mSec. Measure the
distance in feet from the ideal seat (which
is usually 2/3 of the way back from the
stage speakers, centered side to side) to
the stage speakers. Now measure the dis-
tance from the ideal seat to the nearest surround
speaker. Subtract the two measurements. Now add 20
to this number to get the delay (in milliseconds)
required in the auditorium. Set the rotary switch to the
nearest setting in milliseconds.
DIGITAL LEVEL SETTINGS:
Incoming signals feeding the DIGITAL INPUT termi-
nals MUST be trimmed externally to match levels
from the Stereo-Optical signals. These adjustments can
be made at the output of the external digital decoder
or interlock audio tape machine (see manufacturer’s
manual). Make sure that all other B-chain calibration
adjustments have been made prior to adjusting the
digital levels (see special note in the PRELIMINARY
section of the B CHAIN CALIBRATION).
This completes the B chain calibration.
SECTION 6:
OPERATING
INSTRUCTIONS
The MODIIC system is one of the easiest systems to
operate. The Manager/Operator of the sound booth
should review the operation instructions to assure that
emergency functions are also understood, should they
ever be needed.
TURNING ON THE SYSTEM:
The sound engineer who installed the sound system
has provided a way to apply power to the system
through a master power switch or circuit breaker.
Also, several of the individual components in the
equipment rack have their own power switches.
Become familiar with all switches or breakers that con-
trol power to the sound equipment.
If the components are normally turned on individual-
ly, it is important that the processing components are
turned on first and the power amplifiers are turned on
last. This will allow time for the low level circuits to
stabilize so that the power amplifiers will not pass a
“turn-on thump” to the auditorium speakers. Repeat
in reverse order when turning off the system.
MUSIC SELECTION:
It is likely that the sound system will be turned on
before the arrival of the first audience of the day. The
MODIIC powers up in Music mode. If the music play-
er (CD player or tape machine) is running, music will
be heard in the auditorium and on the booth monitor.
Music may also be selected by pressing the front panel
POSITION
DELAY
0
10
1
20
2
30
3
40
4
50
5
60
6
70
7
80
8
90
9
100
A
110
B
120
C
130
D
140
E
150
F
160
mSec
