Legacy Car Audio LA-1878 - Manual (Page 5)

to remote
turn-on
+12V
head unit
12V battery
L A - 4 7 8
L A -
5 7 8
L A -
7 7 8
L A -
9 7 8
LA- 1478
LA- 1878
LA-
2078
LA-
2278
2CH AMPS
7
inputs
Input Connections
Low Level Stereo Input Connection
L/R audio outputs
head unit
High Level Stereo Input Connection PLEASE NOTE! If using high level
inputs, do not use the low level
RCA inputs at the same time!
wiring harness
L R L R
from speaker terminals
head unit
orange
black
black
orange
Electrical Wiring and Installation
Making Power Connections
1. Connect the +12V terminal directly to the car battery (+) terminal.
2. Connect the GROUND terminal directly to the car battery (-) terminal
OR to a good clean, paint-free chassis ground point.
3. To ensure a good ground, and to prevent “motor-boating” noise in the
system, make an additional connection from the car battery (-) terminal
to the chassis of the stereo unit, using 12 gauge minimum wire.
4. Connect the REMOTE terminal to an external switch for positive 12V
turnon-off. This may be connected to the head unit power antenna lead.
Installation Precautions
This amplifier comes complete with all mounting harware required. Please remember that this is a high-power unit, which generates considerable electrical energy and
heat. Therefore, be sure to install the unit in a place with sufficient airflow, a minimum of dust, and no moisture. Allow enough space around the cooling fins to permit
reasonable airflow and cooling.
• Before you drill or cut any holes, investigate your car’s layout very carefully. Take care when you work near the gas tank, fuel lines, hydraulic line and electrical wiring.
• Do not operate the amplifier when it is unmounted. Attach all audio system components securely within the automobile to prevent damage, especially in an accident.
• Do not mount this amplifier so that the wire connections are unprotected or in a pinched condition, or likely to be damaged by nearby objects. Be sure to select a
location inside your vehicle which has adequate ventilation.
• Before making or breaking power connections in your system, disconnect the vehicle battery. Confirm that your head unit or other equipment is turned off while
connecting the input jacks and speaker terminals.
• If you need to replace the power fuse, only replace it with a fuse identical to that supplied with the system. Using a fuse of a different type or rating may result in
damage to your system which isn’t covered by the manufacturer’s warranty.
Setting Up and Turning On Your New Amplifier
After all electrical connections have been made, and physical installation is complete, turn on your stereo and listen for the amplifier to turn on. If there are any unusual
noises from the speakers, turn the stereo off and recheck ALL wiring.
Assuming the amplifier turn on normally, you may have to adjust the LEVEL control(s) to match the output levels from your head unit. Follow these steps:
1. Set the volume control on your head unit to about the 2/3 position.
2. Adjust the amplifier LEVEL control(s) to an average listening position.
3. Turn the head unit volume all the way down, and listen for background noise.
4. Start your vehicle, and again, listen for background noise.
5. By fine tuning the LEVEL control(s), you can reduce background and engine noise, if present.
These adjustments should only be made once. After that, use the head unit volume control to adjust the system volume, not the LEVEL control(s).
CAUTION: Never turn the LEVEL control(s) up any higher than you need to get clear sound at 2/3 volume on the head unit.
Electrical Connections
(all models)