MANUFACTURER’S 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
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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
Plug in the Remote Bass Boost Control wire in here.
(LA438 WITHOUT)
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
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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
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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
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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
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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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