Legacy Car Audio LA738 User Manual

MANUFACTURERS LIMITED TWO YEAR  
WARRANTY  
LEGACY SOUND CORP. warrants this unit to be free from defective material or workmanship and will repair or  
replace this unit or any part thereof if it proves defective in normal use or service within two (2) years from the  
date of original purchase.  
Our obligation under this warranty is limited to repairing or replacing, at our discretion, the defective instrument  
or any part thereof when it is returned, transportation prepaid to the Legacy Service Center at the address  
below. This warranty will be considered void if the unit has been tampered with, improperly serviced, subjected  
LA4 3 8  
LA5 3 8  
LA6 3 8  
LA7 3 8  
LA8 3 8  
LA9 3 8  
LA1 0 3 8  
LA1 4 3 8  
LA1 8 3 8  
LA2 0 3 8  
to abuse or misuse or if installed in  
a
commercial vehicle. This warranty does not cover accidental damage.  
When returning this unit for service, please include $15.00 for return postage and handling. Send your unit to:  
LEGACY SERVICE CENTER  
1 6 0 0 6 3 rd St reet  
IMPORTANT: Pack carefully in original carton if possible. We are not  
responsible for damage incurred in returning items for repair.  
A
letter  
Brooklyn, NY 1 1 2 0 4  
stating your exact street address, daytime phone number, and the  
problem you are experiencing should be included. You must also enclose  
a
copy of the original receipt as proof of date of purchase.  
FOR YOUR PROTECTION  
Completely and immediately mail the Product Registration Card  
so that we may contact you directly in the event safety  
a
notification is issued in accordance with the 1972 Consumer  
Product Safety Act, or for other reasons Legacy may deem  
necessary.  
TECHNICAL SUPPORT HOTLINE  
Our technical department will gladly answer any questions  
you may have about our products. They cannot, however  
tell you the status of  
a
repair, or handle other customer  
service situations.  
1 -8 0 0 -9 3 4 -2 2 7 7  
Monday t hrough Thursday, 9 AM t o 5 PM  
Friday 9 AM t o 2 PM East ern.  
HIGH SPEED  
CAR AMPLIFIER  
WWW. le g a c y c a r a u d io . c o m  
1
2
3
14  
1
2
3
14  
1
2
Speaker Terminals  
1
2
Speaker Terminals  
These terminals are 14K Gold plated for high conductivity  
and minimum impedance loss. The t erminals face  
upwards for easy wiring in t ight sit uat ions.  
These terminals are 14K Gold plated for high conductivity  
and minimum impedance loss. The t erminals face  
upwards for easy wiring in t ight sit uat ions.  
Fuse  
Protects the amplifier as well as the automobile electrical  
syst em from short circuit condit ions.  
Fuse  
Protects the amplifier as well as the automobile electrical  
syst em from short circuit condit ions.  
Power Supply Terminals  
Power Supply Terminals  
3
4
3
4
Input Level Control  
Use this control to match the output of the head unit  
to the amplifier. If distortion is present, reduce the  
set t ing of t his cont rol.  
Input Level Control  
Use this control to match the output of the head unit  
to the amplifier. If distortion is present, reduce the  
set t ing of t his cont rol.  
5
5
Crossover Mode Switch  
full range system, set this to FULL. If the amp is  
Crossover Mode Switch  
full range system, set this to FULL. If the amp is  
In  
being used to power  
a
In  
being used to power  
a
a
HPF or LPF as needed.  
crossover system, set to either  
a
HPF or LPF as needed.  
crossover system, set to either  
Bass Boost Control  
Allows you to increase the bass signal level sent to the  
speakers  
Bass Boost Control  
Allows you to increase the bass signal level sent to the  
speakers  
6
7
8
9
6
7
8
9
Low Pass Control  
Permits you to adjust the crossover frequency from 35  
Hz t o 4 0 0 Hz t o suit t he subwoofers  
Low Pass Control  
Permits you to adjust the crossover frequency from 35  
Hz t o 4 0 0 Hz t o suit t he subwoofers  
High Pass Control  
Permits you to adjust the crossover frequency from  
8 0 Hz t o 2 .5 kHz t o suit t he t weet ers  
High Pass Control  
Permits you to adjust the crossover frequency from  
8 0 Hz t o 2 .5 kHz t o suit t he t weet ers  
3
High Level Input (Low Impedance)  
Use t hese if your car st ereo does not have  
RCA output jacks: connect the speaker output from  
t he head unit t o t hese input s  
High Level Input (Low Impedance)  
Use t hese if your car st ereo does not have  
RCA output jacks: connect the speaker output from  
t he head unit t o t hese input s  
Low Level Input (High Impedance)  
This unit is provided with gold-plated RCA input  
jacks. Using RCA-RCA type patch cords, connect  
these inputs to the RCA outputs from your head  
unit .  
Low Level Input (High Impedance)  
This unit is provided with gold-plated RCA input  
jacks. Using RCA-RCA type patch cords, connect  
these inputs to the RCA outputs from your head  
unit .  
10  
10  
Power LED Indicator  
This LED is illuminat ed when t he REMOTE ON  
syst em is t urned on.  
Power LED Indicator  
This LED is illuminat ed when t he REMOTE ON  
syst em is t urned on.  
11  
11  
12  
12  
Protection LED Indicator  
Protection LED Indicator  
The protection circuitry in the amp will disable it if it  
senses an input overload, speaker short circuit, or  
thermal overload conditions. Should this occur, the  
PROTECT LED will be illuminated. At that time, it is  
important that you check to determine what has caused  
t he prot ect ion circuit ry t o become act ivat ed.  
The protection circuitry in the amp will disable it if it  
senses an input overload, speaker short circuit, or  
thermal overload conditions. Should this occur, the  
PROTECT LED will be illuminated. At that time, it is  
important that you check to determine what has caused  
t he prot ect ion circuit ry t o become act ivat ed.  
If the amp shut off because of  
allow it to cool down before attempting to restart.  
a
thermal overload,  
If the amp shut off because of  
a
thermal overload,  
allow it to cool down before attempting to restart.  
If the shutdown occured because of an input overload,  
or speaker short circuit, be sure to correct these  
conditions before attempting to restart the amp.  
If the shutdown occured because of an input overload,  
or speaker short circuit, be sure to correct these  
conditions before attempting to restart the amp.  
4
13  
4
To reset the amp, turn the REMOTE power off and on  
again.  
To reset the amp, turn the REMOTE power off and on  
again.  
13  
14  
13  
14  
Remote Bass Boost (LA438 WITHOUT)  
Plug in the Remote Bass Boost Control wire in here.  
Remote Bass Boost (LA638 WITHOUT)  
Plug in the Remote Bass Boost Control wire in here.  
LED Light Bar Swit ch.  
LED Light Bar Swit ch.  
When switch set at"SCAN"position,the LEDs scan  
automatically from left to right over top cover.  
When switch set at"Hold" position light up all the  
LED indicat or.  
When switch set at"SCAN"position,the LEDs scan  
automatically from left to right over top cover.  
When switch set at"Hold" position light up all the  
LED indicat or.  
13 12 11  
8
7
6
5
4
10  
9
9
10  
5
6
7
8 12 11  
8
7
6
5
10  
9
LA438/F5e3at8ur/es7a3n8d /C9on3tr8ol/s 1438/ 1838/ 2038  
LA638/ 838/ 1038  
Features and Controls  
LA 4 3 8  
LA 5 3 8  
LA 7 3 8  
LA 9 3 8  
LA1438  
LA1838  
Making Power Connect ions  
Low Level Stereo Input Connection  
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.  
to remote  
turn-on  
+12V  
Elect rical Connect ions  
(all models)  
12V battery  
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.  
head unit  
LA2038  
2 CH AMPS  
head unit  
Inst allat ion Precaut ions  
This amplifier comes complete with all mounting harware required. Please remember that this is  
electrical energy and heat. Therefore, be sure to install the unit in place with sufficient airflow,  
space around the cooling fins to permit reasonable airflow and cooling.  
a
high-power unit, which generates considerable  
minimum of dust, and no moisture. Allow enough  
L/ R audio outputs  
a
a
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.  
5
Do not operate the amplifier when it is unmounted. Attach all audio system components securely within the automobile to prevent damage, especially  
PLEASE NOTE! If using high level  
inputs, do not use the low level  
RCA inputs at the same time!  
High Level Stereo Input Connection  
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 location inside your vehicle which has adequate ventilation.  
a
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.  
Set t ing 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.  
wiring harness  
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:  
head unit  
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.  
L
L
R
R
4. Start your vehicle, and again, listen for background noise.  
orange  
black  
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 t urn t he LEVEL cont rol(s) up any higher t han you need t o get clear sound at 2 / 3 volume on t he head unit .  
black  
orange  
from speaker terminals  
Input Connections  
inputs  
Electrical Wiring and Installation  
LA 6 3 8  
LA 8 3 8  
LA1038  
LA 4 3 8  
LA 5 3 8  
LA 7 3 8  
LA 9 3 8  
LA1438  
LA1838  
4 CH AMPS  
Low Level 4 CH Stereo Input  
from 2 CH Audio Source  
Bridged Input Connection  
to a second  
amplifier  
LA2038  
head unit  
2 CH AMPS  
Left Output  
head unit  
Y adaptors  
Right Output  
Y
adaptors  
7
LA 6 3 8  
LA 8 3 8  
LA1038  
4 CH AMPS  
Low Level 4 CH Stereo Input  
from 4 CH Audio Source  
4 CH Bridged Input  
from 2 CH Audio Source  
CH1 +2  
CH3 +4  
=
=
Left Channel  
Right Channel  
head unit  
L + R Front Outputs  
L + R Rear Outputs  
Left Output  
head unit  
Right Output  
Y
adaptors  
Input Connections  
Input Connections  
LA 6 3 8  
LA 8 3 8  
LA1038  
LA 4 3 8  
LA 5 3 8  
LA 7 3 8  
LA 9 3 8  
LA1438  
LA1838  
4 CH AMPS  
wiring harness  
High Level 4 CH Stereo Input  
from 4CH Audio Source  
floating ground connection  
Basic Stereo Output  
head unit  
LA2038  
2 CH AMPS  
orange  
orange  
L
R
L
R
black  
black  
black  
orange  
black  
orange  
LEFT speaker  
RIGHT speaker  
REAR  
FRONT  
9
LA 6 3 8  
LA 8 3 8  
LA1038  
4 CH AMPS  
High Level 4 CH Stereo Input  
from 4CH Audio Source  
common ground connection  
Basic 4CH Output  
head unit  
L
R
L
Rorange  
orange  
black  
black  
black  
orange  
black  
orange  
R
L
REAR  
FRONT  
R
L
FRONT  
speakers  
REAR  
speakers  
Input Connections  
inputs  
Speaker Connect ions  
speakers  
LA 4 3 8  
LA 5 3 8  
LA 7 3 8  
LA 9 3 8  
LA1438  
LA1838  
LA 6 3 8  
LA 8 3 8  
LA1038  
4 CH AMPS  
2 CH St ereo plus  
Mono-Bridged  
Subwoofer Output  
Bridged Mono Output  
speakers  
MINIMUM  
SPEAKER  
IMPEDANCE  
4 OHMS!  
LA2038  
L
R
MINIMUM  
SPEAKER  
IMPEDANCE  
4 OHMS!  
Mono  
Subwoofer  
2 CH AMPS  
speaker  
Amplifier will not power up.  
Check for good ground connect ion.  
Check t hat remot e DC t erminal has at least +1 2 v DC.  
Check t hat t here is bat t ery power on t he  
Check all fuses.  
+
t erminal.  
STOP  
Check that Protection LED is not lit. If it is lit, shut off amplifier  
11  
briefly and t hen repower it .  
High hiss or engine noise (alternator whine) in  
speakers.  
4
ohm  
4 ohm  
2-channel Amplifier  
(Operating in  
Disconnect all RCA input s t o t he amplifier(s)  
if hiss/ noise  
2-channel Amplifier  
(Operating in Stereo)  
Bridged Mono)  
disappears, t hen plug in t he component driving t he amplifier  
and unplug it s input s. If hiss/ noise disappears, go on unt il t he  
fault y/ noisy component is found.  
LA 6 3 8  
LA 8 3 8  
LA1038  
4
ohm  
4 ohm  
YES!  
NO!  
Two 4-ohm speakers, wired in stereo,  
will present 4-ohm load to each  
channel of the amplifier. Most two-  
channel amplifiers will work well in this  
configuration.  
Two 4-ohm speakers, wired in parallel  
to bridged two-channel amplifier.  
will present 2-ohm mono load to the  
amplifier. MOST TWO-CHANNEL  
AMPLIFIERS DO NOT SUPPORT 2-OHM  
MONO OPERATION! AMPLIFIER DAMAGE  
COULD RESULT!  
It is best t o set t he amplifier's input level as insensit ive as  
possible. The best subject ive S/ N rat io is obt ainable t his way.  
Try to drive as high signal level from the head unit as possible.  
a
a
a
a
sound around, Inc.  
1600 63rd street. brooklyn. ny 11204  
4 CH AMPS  
Protection LED comes on when the amplifier is  
powered up.  
Check for short s on speaker leads.  
Check t hat t he volume cont rol on t he head unit is t urned  
2 CH Mono-Bridged Output  
down low.  
STOP  
Remove speaker leads, and reset t he amplifier. If t he  
Prot ect ion LED st ill comes on, t hen t he amplifier is fault y.  
speakers  
Amplifier(s) gets very hot.  
4
ohm  
4
ohm  
MINIMUM  
SPEAKER  
IMPEDANCE  
4 OHMS!  
Check t hat t he minimum speaker impedance for t hat model  
is correct .  
4
4
ohm  
ohm  
4
4
ohm  
ohm  
L
R
4-channel Amplifier  
(Operating in  
4-channel Amplifier  
(Operating in Stereo)  
Check for speaker short s.  
Bridged Mono)  
Check t hat t here is good airflow around t he amplifier. In  
some applicat ions, an ext ernal cooling fan may be required.  
4
ohm  
Distorted sound  
4
ohm  
YES!  
Four 4-ohm speakers, wired in stereo,  
NO!  
Four 4-ohm speakers, wired in parallel  
Check t hat t he Level cont rol(s) is set t o mat ch t he signal  
will present  
a
4-ohm load to each  
to  
will present  
a
bridged four-channel amplifier,  
4-ohm mono load to the  
level of t he head unit .  
a
channel of the amplifier. Most four-  
channel amplifiers will work well in this  
configuration.  
Check t hat all crossover frequencies are properly set .  
Check for short s on t he speaker leads.  
amplifier. MOST FOUR-CHANNEL  
AMPLIFIERS DO NOT SUPPORT 2-OHM  
MONO OPERATION! AMPLIFIER DAMAGE  
COULD RESULT!  
sound around, Inc.  
1600 63rd street. brooklyn. ny 11204  
High squeal noise from speakers.  
This is almost always caused by  
a
poorly-grounded RCA  
pat ch cord.  
Troubleshoot ing  
Speaker Connect ions  
troubleshooting  

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