Open or "De-Normalled"
Rear
Front
PHB-265
(Switch to Middle Position)
In the Open or "De-Normalled" bay, signal applied to
the top-rear jacks is available at the top-front jacks,
and signal applied to the bottom-front jacks is
available at the bottom-rear jacks. Top-rear and
bottom-rear jacks are never connected to each other.
One use for the Open configuration is to connect
outboard reverbs or compressors or other signal-
processing gear. With the module set to "De-
Normalled", you can avoid unwanted signal loops
such as the one that would happen if you were to
connect a reverb's outputs directly to its own inputs.
Figure 4 a. shows how this works.
Another use for the Open configuration is to connect
pieces of equipment that have no inputs of their own.
For example, the Left and Right outputs of a CD
player could be connected to separate modules of
the bay, but since there are no corresponding "loads"
for those two channels (
i.e., You can't send any
signal TO the CD player, because it has no inputs),
there would be nothing to plug into the top-front
jacks. Therefore for the CD player and other "play-
only" gear, it makes sense to save space by dou-
bling-up and plugging the Left and Right CD Outputs
one above the other into the Top-Front and Bottom-
Front positions of a single bay module. (See Figure
4 b.)
Notice that Figure 4 b. is the only diagram showing
signal flowing from front to back in both top and
bottom positions. This is one instance where it is
helpful to break the "top-rear IN; bottom-rear OUT"
convention adhered to in every other diagram. Make
sure you label any such dual inputs clearly to avoid
confusion!
Rear
Front
From
REVERB's
OUTPUT
To
REVERB's
INPUT
From CD
LEFT
Output
From CD
RIGHT
Output
To Mixer's
CD LEFT
INPUT
To Mixer's
CD RIGHT
INPUT
Top-Front Jack
is now a
REVERB
SOURCE
Bottom-Front
Jack is now a
REVERB
LOAD (input)
Figure 4a. Arrows indicate direction of signal flow. The
rear top & bottom jacks of Open ("De-Normalled") bays are
never connected to each other, even when no cables are
connected to the corresponding front jacks.
Figure 4b. Arrows indicate direction of signal flow. Open
or "De-Normalled" bays modules are often used to input
signal from devices that have no inputs of their own. This is
one instance that defies the convention of top-rear-IN,
bottom-rear-OUT. It's a great way to save space in the bay.
4 b.
4 a.
Using the Whole Bay
5
Take a moment o look at Fig.2c. again (Page 2). It
shows how a mixer's signals could be routed out to a
compressor and then back through the bay to the
recorder. What it
doesn't show, is how the cables
were run to and from the compressor's input and
output. One way, of course would be to string cables
directly to and from the compressor's input and
output, but if the compressor isn't near the patch bay,
the long cable runs to the front of the bay would be in
the way. A better way to accomplish this would be to
connect the compressor's ins and outs to the rear
panel of the patch bay, too. (
See Fig. 5, Page 5)
Then, all we need are short patch cables from the
corresponding front-panel jacks that represent the
compressor's in and out to the front-panel jacks that
represent the mixer (source) and the recorder (load)
at patchbay Channel One.
In this manner, each signal source and each destina
