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PB-48 Patchbay

INTRODUCTION

UNDERSTANDING PATCHBAYS AND THE dbx PB-48

(1-A) Full-Normalled or Half-Normalled Patchbay (1-B) Half-Normalled [Mult-ed] Patchbay

(1-C) Half-Normalled Patchbay (1-D) De-Normalled Patchbay

[With Rear-Panel Normal Connection Broken]

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

SIGNAL FLOW

FRONT

BACK

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. Normalled means that audio signal

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 plugging into the upper front-panel jack does not break the

connection between the upper and lower rear-panel jacks, but splits the

signal to two destinations, while plugging into the lower front-panel jack

breaks the connection (see Figures 1-B and 1-C). Note: A full-normalled

patch bay’s rear-panel connections are broken when plugging into either

front-panel jack.

A simple example of using half-normalled operation: connect a mixer’s

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

the rear-panel jack directly below it to a power amplifier. The “normalled”

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

for Half-Normalled or De-Normalled patchbay operation without solder-

ing 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 unbalanced TS standard audio 1/4” 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 de-mystify 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.

1 2 3 4

Sommario

Pagina 1 - INTRODUCTION

PB-48 PatchbayINTRODUCTIONUNDERSTANDING PATCHBAYS AND THE dbx PB-48(1-A) Full-Normalled or Half-Normalled Patchbay (1-B) Half-Normalled [Mult-ed] Patc

Pagina 2

(2-A) Unscrew rear panel nut and save it. (2-B) Push down on rear lower jack, and snap board out(2-C) K

Pagina 3 - EXAMPLES OF PATCHBAY SETUPS

EXAMPLES OF PATCHBAY SETUPSFigure 3: Possible Initial Patchbay Setup(Examples of patchpoints for this setup are shown below)(3-A) Patching A Compresso

Pagina 4 - WARRANTY

PATCHBAY TIPSWARRANTYLimited WarrantyThis warranty is valid only for the original purchaser. We warrant dbx products against defects in material or wo

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