Studio Technologies 68A 2001 - Manual (Page 34)

Issue 1, March 2001 Model 68A/69A User Guide
Page 34 Studio Technologies, Inc.
for Surround
In the mute mode, multiple channels can
be muted simultaneously. A channel that
is muted has its associated LED turned
on. The solo mode can operate in one of
two ways: additive or exclusive. How solo
operates follows the configuration set in
the Model 69A Control Console. In addi-
tive solo mode, multiple channels can be
soloed simultaneously. A channel that is
soloed has its associated LED flash on
and off, while the LEDs on the non-soloed
channels are not lit.
As expected, in the exclusive solo mode
pressing a channel button will cause that
channel to be soloed. But, in addition, any
other channel or channels being soloed
will go back to their normal, non-solo
condition. Thus the exclusive solo mode
allows rapid “soloing” of individual chan-
nels. Should more than one channel need
to be simultaneously soloed, simply push
and hold a channel button, then add the
extra channels by momentarily pressing
their buttons.
Remote Controls
Three remote control signals can be con-
nected to the system and configured for
the desired operating characteristics: mute
all, dim, and input select. When remote
mute all is activated the LED on the Model
69A associated with mute all will flash.
If mute all was already active when the
remote mute all function is activated, the
LED will change from being steadily lit to
flashing.
When Remote Dim is activated the LED
on the Model 69A associated with the dim
function will flash. If dim was already
active when remote dim is activated, the
LED will change from being steadily lit to
flashing.
When remote input select is activated,
the LED on the Model 69A associated with
the selected input will flash. If the function
is set for exclusive, no other LEDs will be
lit. If the function is set for nonexclusive,
the LED associated with remote input
select will flash, while the LEDs associated
with any other active inputs will remain
steadily lit.
Technical Notes
Downmix
The downmix function is implemented in
the Model 68 Central Control’s hardware
using simple analog circuitry. From the
factory downmix is defined as: center
dropped in level by 6dB and routed to left
and right; left surround dropped in level by
3dB and routed to left; right surround
dropped in level by 3dB and routed to
right; LFE muted. By making simple resis-
tor changes the level changes can be
easily revised. In addition, provision has
been made to allow the LFE signal to be
routed to the left and right channels during
downmix.
While no soldering is required, a compe-
tent technician is required to perform any
changes to downmix function. This will
help to ensure a safe and successful
modification. Page 5 of the Model 68A
schematic contains the circuitry that imple-
ments the downmix function. Please
contact [email protected] for
a copy of the schematic.
Bandpass Filter
The bandpass filter associated with the
mono-to-center mode is created by cas-
cading (connecting in series) a high-pass