4 3, 7 3 9 3 LA1438 LA1838 LA2038 | Legacy Car Audio LA638, LA838

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.

Electrical Connections

(all models)

to remote

turn-on

+12V

12V battery

head unit

L A 4 3 8

Low Level Stereo Input ConnectionL A 5 3 8

L A 7 3 8

L A 9 3 8

LA1438

LA1838

LA2038

Installation Precautions

head unit

2CH AMPS

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

L/R audio outputs

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.

High Level Stereo Input Connection

wiring harness

head unit

L L R R

orange black black orange

from speaker terminals

PLEASE NOTE! If using high level inputs, do not use the low level RCA inputs at the same time!

Electrical Wiring and Installation

inputsInput Connections

LA1438, LA838, LA2038, LA1038, LA738 specifications

Legacy Car Audio offers a diverse range of high-quality car audio systems, designed to enhance your in-car listening experience. Among their lineup, the LA938, LA538, LA638, LA1838, and LA738 models stand out for their unique features, advanced technologies, and impressive characteristics.

The Legacy LA938 is a powerful multimedia receiver that supports Bluetooth connectivity, allowing for hands-free calling and wireless audio streaming. This model features a built-in USB port, enabling users to charge devices while enjoying music. The LA938 also comes with a 7-inch touchscreen display, offering an intuitive user interface that allows for easy navigation. With impressive sound customization options, including a 7-band equalizer, users can tailor audio output to their personal preferences.

Next up, the LA538 model is a compact and versatile receiver. Its sleek design is complemented by a user-friendly interface. The LA538 supports various media formats, including MP3, WMA, and FLAC, ensuring that you can enjoy your favorite tracks. This model also includes a front auxiliary input, making it compatible with various devices. Its powerful output ensures clear sound quality, making it a great choice for those who appreciate quality audio on the road.

The LA638 is another noteworthy unit that offers an impressive range of features. This model boasts a 6.2-inch touchscreen display and supports both Android and iOS devices via Bluetooth. The LA638 includes customizable LED lighting, which adds a touch of personalization to your car's interior. It also supports rearview camera integration, enhancing driving safety by providing a clear view of the area behind your vehicle.

Moving on to the LA1838, this model is designed for those who prioritize power and performance. With a robust amplifier built-in, the LA1838 delivers exceptional sound quality that can fill any car with rich audio. The receiver supports various audio formats and offers extensive sound tuning features, including a 10-band equalizer, allowing audiophiles to adjust frequency ranges effectively.

Finally, the LA738 is an entry-level receiver that does not compromise on quality. Ideal for budget-conscious consumers, it offers the essential features like USB and auxiliary inputs, Bluetooth connectivity, and a clean, user-friendly interface. With solid performance and reliability, the LA738 ensures an enjoyable listening experience without breaking the bank.

In summary, Legacy Car Audio’s lineup of the LA938, LA538, LA638, LA1838, and LA738 models provides options for every type of car audio enthusiast. With advanced technologies and user-centric features, these receivers elevate the listening experience and prove that quality sound is attainable for all drivers.