Studio Technologies 770 - Manual (Page 38)

Issue 1, October 1997 Model 770 User Guide
Page 38 Studio Technologies, Inc.
Model 770
5. Adjust the AUX master level control so
that the meter displays 0 VU. The AUX
bus is now set for unity gain.
6. The procedure has now been com-
pleted. Return the 1kHz to main and
AUX button to the off (out) position.
Signal Present/Peak LEDs
Bi-color status LEDs are provided on the
mixer section’s mic/line input sections.
Under normal operating conditions the
LEDs should light only with the color
green. Signal peaks may cause an occa-
sional red flash, but sustained lighting of
the peak indicator means that audio per-
formance is being compromised. Adjust
the level controls so that you aren’t “in the
red” except on rare occasions.
Limiter/Compressor
While the Model 770 was designed to
provide lots of signal “headroom,” most
applications, especially broadcast, won’t
benefit from it. In fact, wide dynamic
range, in many cases, will simply tax the
transmission chain and lead to signal
degradation. Our feeling is that leaving the
limiter/compressor in the on state is your
best bet. If you can’t think of a good rea-
son why extended dynamic range on the
mixer section’s main audio bus is desired,
leave the limiter/compressor active!
Don’t misunderstand our position: Ex-
tended dynamic range is great for music
recordings. We love listening to terrific
classical, jazz, and, when available, pop
recordings. But for most applications
served by the Model 770 dynamic range
is not really a factor.
Talent Amplifiers
Both the Model 32 and Model 33 Talent
Amplifiers utilize a ¼-inch 2-conductor
phone jack for their audio output. On the
Model 32, either IFB audio or the channel
2 audio source, if configured, can be
selected as the audio source. On the
Model 33, either or both audio signals
can be selected. The level control(s)
should be adjusted for the desired level.
Note that even when the level control(s)
are set to the fully counterclockwise posi-
tion, the audio output will not be fully “off.”
This ensures that personnel will never
(hopefully!) miss an important cue be-
cause a level control was accidentally
turned “off.”
Technical Notes
¼-Inch Plugs and EIA RS-453
An incompatibility problem lurks between
some ¼-inch 2-conductor and 3-conduc-
tor phone plugs and the jacks found on
professional audio equipment. While all
the plugs seem to “look” the same, some
do not comply with the industry standard,
called EIA RS-453. This standard defines
the physical dimensions, including the
shape of the plug’s tip. It seems that some
plug manufacturers don’t bother to make
the tip comply with the standard.
Why is this relevant to you? Because the
phone jacks used on the Model 770 do
comply with the standard, and they expect
to be mated with plugs that do, too.
Should a connection seem “flaky,” sound
noisy, or make intermittent contact, the
most likely problem is a nonstandard
phone plug. Replace the plug if this is
the case.
You should find that all plugs from
Switchcraft or Neutrik will work correctly,
specifically Switchcraft No. 297 or Neutrik
NP3C. In our experience, headphones are