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5
What is the Access
™
System?
The Access
™
System consists of a variety of intelligent switching modules. These modules communicate with
each other via the “system bus,” allowing you to construct the exact demonstration system configuration you
desire from the sources, processors/equalizers, amplifiers, speakers, and subwoofers in your display. The
switching modules are located near the actual products on display creating a “distributed switching net-
work.” The products are connected to the modules rather than being wired to one central point. Selected
product signals are then sent across the network through “buses” that interconnect the modules. A simplified
view is shown below.
DEFINITION OF TERMS
To successfully install your new Access Demonstration Network, you should
familiarize yourself with the following terms:
Address A number that pinpoints the identity and location of a
switch module within a system. The installer sets numeric
switches like the ones in Figure 2 for each module which
provides a unique address in the proper sequence for each
component connected to the system.
AutoDamping
™
When merchandising many pairs of different speakers in a
showroom, the drivers of the unselected speaker pairs
become passive radiators when the currently active
speaker pair is playing, absorbing much of the sound
coming from the speakers being played. AutoDamping
™
is a circuit in the Model 932 that
electrically disconnects (shorts) speakers not being played, thereby automatically damping
them as passive radiators and improving sound quality in the showroom.
Bus A Bus is a pathway for signals to travel from module to module; a cable connecting
modules. There are three types of buses found in most AccessEZ Systems:
• System Bus A four wire harness (red, black, yellow, blue) connected to every
AccessEZ module. The System Bus carries the signals that control the selection of
the components and perform various housekeeping functions among the modules
in the system.
• Speaker Bus (or High Level Bus) A four wire harness (green, white, brown, gray)
that carries speaker-level signals from source and/or amplifier modules to
speaker modules.
• Low-level Bus A signal bus using RCA patch cables to carry low-level audio
signals between source modules and equalizer or amplifier modules.
Figure 1.
Figure 2. This example shows an
address setting of 0/00. Typically
this would represent the first
module (components 1 through 4)
in the Source Product Group.
Source
Switching
Module
System
Module
Amplifier
Switching
Module
Left
Speaker
Switching
Module
Right
Speaker
Switching
Module
SYSTEM BUS
SPEAKER BUS
Product
Select
Button
Remote
Control
Control
Panel
LOW LEVEL BUS
CONTROL PANEL CABLE