Studio Technologies 78 2004 User Manual

Page 16

Issue 5, January 2004

Model 78/79 User Guide

Page 16

Studio Technologies, Inc.

for Surround

true log mode, normal listening may
require the level control to be set to ap-
proximately the 2-o’clock position. Other
users may be more comfortable with the
response given by the modiﬁed logarithmic
mode. This provides a much greater out-
put level during the ﬁrst 50% of the level
control’s travel. When conﬁgured for the
modiﬁed log mode, normal listening may
require the level control to be set to the
11- or 12-o’clock position. The modiﬁed log
mode more closely matches the monitor
level control performance found in many
audio consoles. As such it is selected as
the default mode.

It’s important to note that changing the
level control response conﬁguration will
impact the reference level. Changing from
modiﬁed log to true log, or vice-versa, will
change the reference level. Technically, the
mathematical value stored as the refer-
ence level does not change, but the result-
ing loudness that is heard by the operator
will change. Be warned! Changing the level
control response may require the reference
level to be re-calibrated.

Level Control Auto Mute All
The level control auto mute all function
automatically mutes the monitor output
channels whenever the rotary level control
is in its fully counterclockwise position. In
some applications it may be desirable to
disable this function. When disabled, the
rotary level control adjusts the monitor out-
put level over the conﬁgured level range;
no automatic muting takes place.

Output Level Offset
To provide assistance during room calibra-
tion, the relative output levels on seven
of the eight output channels can be adjust-
ed. The exact calibration procedure

is covered later in this document. A con-
ﬁguration parameter selects whether the
output level offset function is set for view
only, or view and change. The view only
mode allows users to view the level offset
settings, but serves as a “lock out,” prevent-
ing a calibrated system from accidentally
being changed. Unless the level offsets are
actively being adjusted to their desired val-
ues, it is recommended that the view
only mode be selected.

Output Level Range
To meet the needs of different applications
the output level range can be selected. In
mode 1 the input-to-output level has a min-
imum gain of –70 dB and a maximum gain
of unity (0 dB). When the rotary control is
set to its fully counterclockwise position,
–70.0 will display on the readout. Set to
its fully clockwise position, 0.0 will display.
In mode 2 the input-to-output level has a
minimum gain of –80 dB and a maximum
gain of –10 dB. The display will read over a
range of –80.0 to –10.0.

Reference Level
For audio-with-picture applications it’s criti-
cal that mixing be done in reference to
a known monitor loudspeaker level. This
is often referred to as mixing to “85 dB” on
the monitors. The Model 79 Control Con-
sole allows a precise monitor output level
to be stored, and then enabled by pressing
the button labeled REF. Setting the refer-
ence level is very simple:

1. Set up a precision sound pressure level

(SPL) measuring device at the desired
listening location.

2. Place the StudioComm system in the

normal operating mode, not the conﬁg-
uration mode. Be certain that the refer-
ence and dim functions are not active.

This manual is related to the following products:

79 2004