PHB-265
"Half-Normalled"
For "Half-Normalled" operation, switch to the
right, using a ball-point pen or other pointed
object. Switches are recessed to prevent
accidental changes.
3
Patch-Bay Types
(Continued)
A "Half-normalled" bay is one which allows you to break the connection between the
rear top and bottom
jacks simply by plugging a cable into the
bottom-front jack. This is a very versatile configuration, allowing a
number of different signal-flow scenarios. Let's continue to build upon our original example.
REAR
FRONT
Figure 2 (a., b., c.) Arrows indicate direction of signal flow. Notice that until a cable is inserted into the bottom-front jack,
signal is passed from top rear to bottom rear without interruption (a), and may also be accessed at the top front jack (b).
But when a cable is inserted into the bottom-front jack, signal flow from top jacks to bottom jacks is interrupted (c).
REAR
FRONT
REAR
FRONT
a.
b.
c.
Figure 2a. (above) shows a detail of the switching
jack (bottom-front position). With nothing connected
to the switching jack, signal passes directly from top
rear to bottom rear, or from mixer OUT to recorder IN
in our example, and the same mixer OUT signal is
also available at the top-front position. (Figure 2b.
above.) In other words, the top-front jack is now a
SOURCE; an extension of the mixer OUT.
Notice however that when a cable is plugged into the
bottom-front jack, (Figure 2c.) the connection is
broken between top and bottom jacks at the rear of
the bay. To examine why that's a good thing, let's
From
Mixer's Ch.
1 OUTPUT
To
Recorder's
Ch. 1 INPUT
say we wanted to run our Mixer's Channel 1 OUT-
PUT into a compressor before we send the signal on
to the recorder. All we have to do is connect the
compressor's IN and OUT to the corresponding front
jacks on the bay (Figure 2c.) and signal now flows
from the mixer's OUT to the compressor's IN and
from the compressor's OUT to the recorder's IN. And
this is all accomplished without crawling around on
your hands and knees behind your equipment.
In addition to inserting devices into the signal path,
the half-normalled bay configuration also allows you
to substitute a different signal altogether. In our
From
Compressor's
OUTPUT
To
Compressor's
INPUT
From
Mixer's Ch.
1 OUTPUT
To
Recorder's
Ch. 1 INPUT
From
Mixer's Ch.
1 OUTPUT
To
Recorder's
Ch. 1 INPUT
Top-front Jack is an
additional SOURCE
of signal from Mixer
Ch 1, AND signal
continues to rear-
bottom jack as well.
2 a., b., c.
