PB-48 PATCH BAY SYSTEM
8
After a pair of jumpers is removed, we recommend saving them for possible
later re-installation by storing them in place, but positioned so that each contacts
only one of the two pins.
Note:
The proper positioning of the jumpers for standard,
half-normal operation is with the long dimension left-to-right. Do not install them in
the front-to-back orientation.
Multing
A group of jacks connected together is called a mult. One of the PB-48s
unique features is that you can choose any number of jacks and wire them to-
gether to form a mult of any size, up to the entire 48 jacks of the patch bay. (
Note:
Multing is not possible with the PB-48D.) For example, as in Example 5, you could
connect four of the top front panel jacks together, and four of the lower front panel
jacks together to make two mults. In this case the two sets of multed jacks are not
connected to each other top-to-bottom.
Example 5 illustrates the use of a mult. A patch cord connects Effects Send to
one of the group of four Mult 1 jacks. This signal will now also be present at the
other three Mult 1 jacks. These three are then patched to three different effects
processors. The outputs of the three processors are patched to three input chan-
nels of the mixer, so you can creatively mix and pan them to achieve a unique
sound.
To create mults of three or more jacks, remove the front cover as described
under Non-Normalling above and remove the modules that will comprise it. Look
for unsoldered connection points on each modules circuit board labeled
T
for
tip,
R
for ring, and
G
for ground (sleeve). There are
T
and
R
points for both the
top and bottom jacks. (The bottom
T
and
R
may or may not be labeled. They are
located in a line directly under the
G
point.) The connection points are positioned
to allow easy wiring from one circuit board to adjacent boards. Pass a bare, 22
gauge solid wire through each hole and solder it to the corresponding holes on
adjacent boards. Note that the signal ground on each circuit board is isolated from
the chassis and from other circuit boards (to prevent ground loops), so the ground
must be wired along with the signal lines. Therefore, five wires are used to link
together a group of modules intended to be a mult. If these modules are turned
around (as described under Non-Normalling above) and nothing is plugged into
the rear jacks, there will result a single mult as wide as the number of modules
tied together, and encompassing both the top and bottom rows. If you wish to
create separate mults in the top row and the bottom row (as in Example 5), it is not
necessary to turn the modules around, but you must cut the two traces comprising
the normal link between the top and bottom jacks on each module making up the
mults. The proper places to cut can be identified as two very narrow traces just
below the upper
T
and
R
points. Cut them cleanly with a sharp implement and curl
the cut ends back to make sure there is no chance of shorting.
Example 5
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