Studio Technologies 58 1998 - Manual (Page 23)

Model 58/59 User Guide Issue 2, April 1998
Studio Technologies, Inc. Page 23
for Surround
2. Using the Model 59 Control console,
select input 1 as the audio source.
Be certain that insert 1 and 2 are not
enabled. Enable the mute all function,
ensuring that you won’t have to hear
a steady tone during the entire
procedure!
3. Confirm that the audio source con-
nected to input 1 is generating a
steady signal at precisely its reference
level. (This is assumed to be nominally
+4dBu.)
4. Observing the level meter, adjust input
trim pot 1 to give a +4dBu level at
meter output 1.
5. Disconnect the level meter from meter
output 1 and reconnect it to meter
output 2.
6. Observing the level meter, adjust input
trim pot 2 to give +4dBu.
7. Repeat steps 1-6 for line inputs 2, 3,
and 4.
Once all eight line inputs on the first Model
58 have been calibrated, repeat the entire
procedure for the additional Model 58
units.
Insert Return Trim Pots
Describing the calibration process for the
insert returns is a bit more difficult as the
exact implementation of the insert sections
is dependent upon the specific installation.
The goal is to have no level change occur
when switching an insert section between
disabled and enabled. Note that the insert
send outputs are not calibrated for a
precise +4dBu nominal level. Trim pots on
the insert returns allow inaccuracies in the
connected device’s input and output levels
to be accounted for.
The following procedure would be appro-
priate when an insert section is configured
to place another device in the audio path.
A device commonly used in this type of
application would be a surround sound
encode/decode unit. The procedure also
assumes that precision metering devices
are not connected to the meter outputs.
1. On the first Model 58, connect the
audio level meter to meter output 1.
2. Using the Model 59 Control console,
select input 1 as the audio source.
Confirm that inserts 1 and 2 are dis-
abled. Enable the mute all function,
ensuring that you won’t have to hear
a steady tone during the entire
procedure!
3. Confirm that the audio source con-
nected to input 1 is generating a
steady signal at precisely its reference
level.
4. Observing the level meter, confirm that
the output level is exactly +4dBu. (If
this is not the case, the input trim pot
must be re-calibrated.)
5. Using the Model 59 Control Console,
enable insert 1.
6. Observing the level meter, adjust the
trim pot associated with insert 1, return
1 to give a +4dBu level.
7. Disconnect the level meter from meter
output 1 and reconnect it to meter
output 2.
8. Repeat steps 4, 5, and 6 for insert 1,
return 2.
9. If insert 2 is being utilized, repeat the
procedure for its two return trim pots.