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942
916X
942
Amplifier Product Groups
The low-level outputs of products in the Processor/EQ/Crossover group are
connected to the next logical component in the signal path, the Amplifier
Product Group. Generally, amplifiers come in two different varieties; those
that have low-level and high-level inputs and those that only have high-level
inputs, normally called “boosters.” These two types of amps require different
switching modules and belong in different Product Groups. If there are no
booster-amps in your display, then you probably want to divide the amplifi-
ers you wish to display into Front-channel amps, Rear-channel amps, and
Subwoofer amps (see example in Figure 8).
Many of today’s amps have multiple inputs and outputs such as 4-channel
amplifiers with Front Left/Right-INs/OUTs and Rear Left/Right-INs/OUTs.
There are 6-channel amplifiers, most with their own internal crossovers, and
amplifiers that can be specially configured, depending on how you hook them
up (e.g. Front L/R Stereo IN/OUT, Rear bridged in mono for Subs).
When planning for demonstrating these
multichannel amps, you will need to
support each L/R input to the amp, and
each L/R output from the amp.
So, a 4-channel amp could be used as
shown in Figure 9. The Front L/R Input
signal would come from the Processor/EQ
Product Group to the Front amplifier
Product Group’s Model 942 Amplifier
Selector through the Front Low-Level Bus.
The amplifier in position #1 receives the
front input L/R signal through the 942 Amp
Module and sends its front output L/R
signal back through the 942 in the Front
Amp Product Group. The Sub input signal
in this example passes through position #1
on the 942 Amp Selector for the Sub Amp
Product Group. The High-Level Bus
then passes the signals on to the Front
and Sub speaker groups.
Amp Sharing
It is sometimes desirable to have 2-
channel or 4-channel amplifiers
available to play in more than one
Product Group. For example, you may wish to show the same
amplifier driving a Front, Rear, or Sub speaker group. This method of
demonstration lowers your display inventory investment and con-
serves space.
The Access™ System allows the user to share an amp in different Product
Groups. To achieve “Amp Sharing”, one must use a Model 942 for each
Product Group that the shared amp will appear in. Also, the amp must
receive an input signal from the processor’s output for each source or source
unit group (see Figure 10). There are several ways to set up amp sharing
systems, so call Audio Authority at 800-322-8346 with questions.
916X
942
980
916X
942
942
916X
Figure 8. Dedicated EQ and Front/
Rear/Sub Amp Groups.
Head Unit Low-Level Bus
Dedicated EQ
Front
Amps
Rear
Amps
Sub
Amps
Figure 9. 4-channel amplifier switching
(Front/Rear or Front/Sub).
PSBs
Front/Sub
Front
Input
Output
Low-Level
Buses
Sub
942 942942
916X
993
Figure 10. One shared amp may be
selected for front rear or sub positions
(see Appx. B p. 48).
Front
Rear
Sub
Model 993
Amp Sharing
Adapter
Shared
Amplifier