DBX PB48 Manual

DBX Ikke kategoriseret PB48

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Side 1/5

PB-48 Patchbay

INTRODUCTION

UNDERSTANDING PATCHBAYS AND THE PBdbx -48

(A) Normalled Patchbay (B) Half-Normalled [Mult-ed] Patchbay

[With Rear-Panel Normal Connection Broken]

Figure 1: Normalled, Half-Normalled and De-Normalled Patchbay Operation

SIGNAL FLOW

FRONTBACK

SOURCE 1

OUT

BACK

SIGNAL FLOW

FRONT

TO LOAD 2

TO LOAD 1

SOURCE

OUT

BACK

SIGNAL FLOW

FRONT

TO LOAD 1

TO LOAD 2

SOURCE

OUT

BACK

SIGNAL FLOW

FRONT

TO LOAD

The PB-48 is shipped from the factory with its circuit boards installed for

half-normalled patchbay operation. means that audio signalNormalled

automatically flows between a vertical pair of patchbay jacks without the

need for patchcords (see Figure 1-A). Normalled patchbays may be half-

normalled or full-normalled. In the half-normalled PB-48, each rear panel

upper jack is respectively normalled to the jack directly below it as long

as nothing is plugged into the lower front-panel jack. Half-Normalled

means that pluggging into the upper front-panel jack does not break the

connection between the upper and lower rear-panel jacks, while plug-

ging into the lower front panel jack breaks the connection (see Figures

1-B adn 1-C). Note: A full-normalled patch bayÕs rear-panel connections

are broken when plugging into either front-panel jack.

A simple example of using half-normalled operation: connect a mixerÕs

monitor out to one of the PB-48Õs rear panel upper jacks, then connect

the rear panel jack directly below it to a power amplifier. The ÒNormalledÓ

signal will flow from the mixer monitor out to the power amplifier, and will

only be broken when a connection is made to the corresponding front

panel lower jack.

Congratulations on purchasing the dbx PB-48 rackmountable patchbay.

The PB-48 features 48 front panel patchpoints and 48 rear panel patch-

points, from 24 user-adjustable board assemblies that can be configured

forHalf-Normalled or De-Normalled patchbay operation without soldering

or cutting wires. The PB-48 is a rugged, noise-free, patchbay designed

to serve all your patchbay needs, from providing clear and easy access

to your mixer and other studio gear, to reducing the wear and tear on

their jacks, to facilitating quick and precise re-routing of devices within

your studio setup. PB-48 patchbay jacks accept balanced TRS or unbal-

anced TS standard audio 1/4Ó plugs.

We recommend that you take a moment and read through this instruc-

tion sheet as it provides information that will assist you in using your

patchbay to its fullest. Explanations of standard patchbay jargon, with

plenty of pictures, are included to help demystify common patchbay

points of entanglement and clear up any misunderstandings you might

have. Examples, suggestions and tips are provided as a starting point

only. Experiment with different setups, so that you find the setup that

best fits your system.

(A) Unscrew rear panel nut and save it. (B) Push down on rear lower jack, and snap board out

rotate the board 180û. push rear upper jack (in and up) to snap board into place.

(E) Re-tighten upper jack with nut from step A.

Figure 2: De-Normalled Configuration Steps [To Re-Normalize, repeat steps]

TIGHTEN

FRONT

PUSH IN AND UP FRONT

BOARD AFTER 180 ROTATION

(logo on bottom)

°°

PUSH

HERE

FRONT

UNSCREW

FRONT

The front panel upper jacks in a Half-Normalled/Normalled patchbay are

usually considered to be outputs because each front panel upper jack is

wired directly to its corresponding rear panel upper jack, where the audio

connection is initiated (see Figure 1-B). For example, connecting a head-

phone to the front panel upper jack allows you to Òlisten inÓ to the signal

from the corresponding rear jack. This setup is sometimes called a Mult-

ed patchbay, because the patchbay simultaneously routes the rear panel

signal (i.e., signal fed to the rear upper jack) to multiple points: one out-

put to the rear panel lower jack and one output at the front panel upper

jack. A possible setup might have a mono mix sent to the rear upper jack,

the routed signal at the lower rear jack fed to the power amp, and the

routed signal at the front panel upper jack connected to a tape recorder

input for a mono tape mix.

The front panel lower jacks in a Half-Normalled/Normalled patchbay are

called inputs because they actually interrupt the signal fed into the corre-

sponding rear panel upper jack and provide a new input to the rear panel

lower jack (Figure 1-C). For example, inserting a DAT recorder signal into

the front panel lower jack routes the tape signal directly to the corre-

sponding rear panel lower jack. Note, however, that the front panel upper

jack retains the signal from the rear panel upper jack.

The front panel lower jack input can also be used to alter its correspond-

ing rear panel upper jack input when the board assembly is correctly

patched to a signal processor (e.g., an equalizer, compressor, gate, etc.).

Start with a mixer and amp connected to one vertical pair of the patch-

bayÕs rear panel jacks, as described before. Then, connect the front

panel upper patchbay jack (which has the mixerÕs output signal) to the

processorÕs input, and connect the processorÕs output to the front panel

lower jack input which feeds the amp.

To connect devices like effects or signal processors directly to the PB-

48Õs rear panel jacks, so that they are accessible through a vertical pair

of front panel patchpoints, the PB-48 must be De-Normalized (see Figure

1-D for example and Figure 2 for customization instructions).

In a (or ) patchbay, each front panel jackDe-Normalled Non-Normalled

is routed directly and only to the corresponding rear panel jack (i.e., first

upper front to first upper rear, first lower front to first lower rear, etc.). De-

Normalled operation is especially useful with effects devices or other

input/output devices because its ÒstraightÓ signal flow helps reduce feed-

back or the chance of oscillations through signal loops.

Although a De-Normalled circuit board eliminates Mult-ed outputs, the

number of possible ÒstraightÓ signal connections is increased. For exam-

ple, to provide access to all the inputs of a 16-channel mixer, connect the

first eight pairs of the patchbayÕs rear panel jacks respectively to the 16

mixer inputs. Now, plugging a synthesizer into one of the front panel

patchpoints routes the synthesizer signal directly to the corresponding

mixer input. Note that all of this can be accomplished using only 1/3 of

the patchbay.

Produkt Specifikationer

Mærke:	DBX
Kategori:	Ikke kategoriseret
Model:	PB48

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