Studio Technologies 58 1998 - Manual (Page 24)

Issue 2, April 1998 Model 58/59 User Guide
Page 24 Studio Technologies, Inc.
for Surround
Once the insert returns on the first Model
58 have been calibrated, repeat the entire
procedure for the additional Model 58
units.
Monitor Output Trim Pots
A trim potentiometer is associated with
each of the two monitor output circuits.
Note that while there are two 2-channel
monitor output connections—A and B—
there is only one pair of output circuitry.
Relay contacts are used to switch the
output circuits between the A and B con-
nections. Installation-specific requirements
will dictate how the monitor output trim
pots are to be adjusted. In most cases the
trim pots will be adjusted to give exactly
the same output level on all the channels.
Other installations may require the trim
pots to be adjusted in reference to the
outputs of the audio power amplifiers.
For this discussion, we’ll describe how
to match the output levels of the monitor
outputs.
1. Start by turning off the AC mains
power on all audio power amplifiers.
If loudspeakers with integrated amplifi-
ers are being used, turn them off too.
This “power down” is critical, ensuring
that high-level test signals do not get
sent to the loudspeakers. Don’t mess
around—turn off the amps now!
2. Confirm that the audio source con-
nected to input 1 is generating a
steady signal at precisely its reference
level.
3. Using the Model 59 Control Console,
select input 1 as the audio source.
Enable monitor output A. Confirm that
inserts 1 and 2, as well as the mute all
and dim functions are disabled. Slowly
turn the rotary level control clockwise.
If audio is heard, stop raising the level
and turn off any active amplifiers. Turn
the control until it is fully clockwise,
providing the maximum monitor output
level.
4. Connect the precision audio level
meter to channel 1 of monitor output
A.
5. Observing the level meter, adjust
monitor output trim pot 1 to give ex-
actly +4dBu.
6. Disconnect the level meter and con-
nect it to channel 2 of monitor output
A.
7. Observing the level meter, adjust the
monitor output 2 trim pot to give ex-
actly +4dBu.
8. Once the monitor outputs on the first
Model 58 have been calibrated, repeat
steps 4-7 for the additional Model 58
units.
9. On the Model 59 Control Console, turn
the output level control to the fully
counterclockwise position.
10. After confirming that the level control
is fully counterclockwise, activate AC
mains power to the audio amplifiers
or amplified speakers.
Model 59 Operating
Parameters
Many StudioComm for Surround functions
can be configured to meet the exact needs
of your installation. Here’s an overview of
what you can configure:
• Number of output channels to be sup-
ported
• Input signals supported for each input
channel