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958
915X
Figure 7. Basic Processor/EQ
hookup for low-level inputs and
outputs with DC power.
Front Out
Rear Out
Sub Out
Source In
DC Power
910
Figure 6. Basic Head
Unit hookup with high
and low-level plus DC
power.
CHOOSING THE CORRECT SWITCHING MODULES
The Access
™
System is very
versatile and can be installed and
wired in many different ways,
including the wrong way. Your
Account Manager can help you
choose the modules that will best
suit your needs. If at any time
you wish to change your mer-
chandising approach, Access can
be rewired and additional
modules can be installed to
accommodate a different configu-
ration.
Product Groups
When planning the installation,
try to think of the components
you wish to display as belonging
to a particular family or GROUP, and where those components might
reside in the signal path, for a typical vehicle installation.
Head Units
The Model 910 is a good choice for almost every type of head unit, from
simple 2-channel powered tape/tuner units with only high-level
outputs, to CD/tuner units that have low-level outputs (preamp) for
rear channels and high-level outputs (speaker-level) for front channels.
Both of these varieties belong to the same source family or Product
Group and may be switched with the Model 910D (see Figure 6).
Processors and Equalizers
The next logical Product Group in the signal path may be Processor/
EQs/Crossovers. Generally, these devices have 2-channel (stereo) low-
level inputs that are processed through a dividing network to derive multiple output channels
(e.g. 2 in x 6 out; see Figure 7). Products in this group are usually wired in the signal path just
prior to the amplifier(s) input. Most of these processors have a wide range of adjustable
controls that, when over-adjusted, can interject noise (distortion, hum, etc.) into the system.
Check the gain setting controls, crossover frequency, and other control settings on your
products often. Powered Equalizers would not be included in this Product Group. For the
bypass option, remember to leave the fourth position open on the last 958 module in the
Processor/EQ Product Group. That position is reserved for the bypass connection, so no
processor or EQ can be connected (see pp. 6, 40).
You may not wish to buy the extra switching modules to create a
separate Product Group for Processor/EQs, especially if you only carry one or
two models of crossovers or passive EQs. However, if you want more than one
amp to play at any given time, there should be at least one device (a crossover
or processor) in the signal path that can accept a 2-channel low-level input from
a source, and deliver front, rear and sub low-level outputs to amplifiers. Many
retailers use a single dedicated crossover, buried inside the display, to derive
multiple output signals for multiple amp inputs. This may be the simplest
solution for your display (see Figure 8). Our Model 9A80 Crossover was
designed just for this purpose. Call your Audio Authority Account Manager for
details (800/322-8346).
Figure 5. Basic car audio
signal flow for a system
including Front, Rear and Sub
amplifier and speaker Product
Groups.
Source Units
Processor/EQs
Front Amps
Rear Amps
Sub Amps
Subwoofers
Rear Speakers
Front Speakers