37
3. Connect the Battery
If a battery is to be used as part of your DC power system, install it in the system between the power
supply and the DC distribution system you installed earlier.
A. Locate your battery within 10 feet (3 meters) of the power supply, preferably an Audio Authority
Model 277 Hybrid
™
Power Source.
WARNING: Never allow battery terminals to be shorted to one another. Keep all metal tools away from the
battery’s terminals, power supply terminals, and all terminals on 916Xs once the battery is connected.
B. Turn off the power supply. Disconnect the red and black
battery leads you connected to it for initial testing and
connect them to the red (+) and black (–) battery terminals
(see Figure 29 and Figure 42).
C. Connect the positive (red) cable from the 277 Power
Source to the battery as shown. Secure the battery
connection with a wing-nut and stud furnished with the
Model 277.
D. Connect the negative (black) cable in the same fashion.
4. Install the Remaining Products
• Install the rest of the sources, amplifiers and speakers by
groups, working from the bottom of the display toward
the top (for electronic products).
• Check all connections in each product group as it is completed.
5. Test Product Selection
This section covers operation of Access
™
Systems using PSBs rather than a Control Panel. For operation of
systems utilizing a control panel, please see the separate User’s Guide included with the control panel.
A. Make sure the system is on (check power lights on switch modules).
B. Select products to play by pressing the PSBs next to one product in each product group. The PSB
lights, confirming that the product is selected.
C. Adjust product controls to get the desired audio level.
D. Select a new product in any group by pressing its PSB. The previous selection is automatically
canceled. Select every product in each group to be certain all products are correctly installed.
Troubleshooting Noise Problems
Unwanted noises such as hum, transport-related noises, or switching-related popping, etc., sometimes occur
for seemingly no reason. The
Access
car audio system topology combats these noises by automatically double-
grounding the inputs of both selected and deselected amplifiers, because a car audio display presents a
different electrical environment than a car.
1. If an undesired noise turns up in the audio of one or two products, carefully check the products them-
selves and their wiring for defects. If a whole group of electronics or a large part of it is affected, review the
system wiring— or ask someone else to do it— to uncover anything that may have been overlooked
during installation, especially in the type of shielded cables that were used.
2. If noise persists, add 982A isolators in all signal paths between the EQ group and the 980 as shown in
Figure 43.
942
916X
Car Battery
2/77
Power
Source
Black (–)
Red (+)
Figure 42. Install the optional car
battery between the power supply and
the DC distribution system.
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