LA480 LA1080
LA580 LA1480
LA680 LA1880
LA780 LA2080
HIGH SPEED
CAR AMPLIFIER
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Legacy Blue Diamond Amplifier Features
all amps feature:
• Polished chrome finish w/plexiglass panel
• Soft turn on/off circuit
• Variable gain control
• Fully adjustable electronic crossover network
• Remote control Bass boost ( 0 – +18dB @ 60Hz )
• 2 ohm stereo stable
• Remote turn on/off
• Hi/low level inputs
• Power on LED indicator
• Bridgeable into 4 ohms
• MOSFET PWM power supplies
• LED protection indicator
LA480 LA580 LA680 LA780 LA1080 LA1480 LA1880 LA2080
Specifications
2CH amplifier
2CH amplifier
4CH amplifier
2CH amplifier
4CH amplifier
2CH amplifier
2CH amplifier
2CH amplifier
OUTPUT POWER
RMS @ 4 OHMS
RMS @ 2 OHMS
MAX OUTPUT
2 X 40W
2 X 60W
2 X 300W
1 X 600W
2 X 50W
2 X 85W
2 X 400W
1 X 800W
4 X 35W
2 X 75W
4 X 75W
2 X 125W
2 X 200W
2 X 800W
1 X 1600W
2 X 150W
2 X 230W
2 X 900W
1 X 1800W
2 X 200W
2 X 320W
2 X 1200W
1 X 2400W
4 X 55W
2 X 125W
2 X 500W
1 X 1000W
4 X 125W
4 X 250W
2 X 500W
(2 X 250W+1X500W)
4 X 500W
2 X 1000W
(2 X 500W+1X1000W)
BRIDGE MODE
FREQUENCY RESPONSE
10-30 kHz
INPUT IMPEDANCE
LOW LEVEL INPUTS
HIGH LEVEL INPUTS
10 k-Ohms
100 Ohms
INPUT SENSITIVITY
LOW LEVEL INPUTS
HIGH LEVEL INPUTS
250 mV
2.5V
POWER SUPPLY VOLTAGE
14.4 VDC/NEG GD (10.5-16V)
MATCHING SPEAKER IMPEDANCE
STEREO MODE
2-4 OHMS
4-8 OHMS
2-4 OHMS
4-8 OHMS
2-4 OHMS
4-8 OHMS
2-4 OHMS
4-8 OHMS
2-4 OHMS
4-8 OHMS
2-4 OHMS
4-8 OHMS
2-4 OHMS
4-8 OHMS
2-4 OHMS
4-8 OHMS
BRIDGED MODE
MAXIMUM CURRENT DRAW
15 A
15 A
20 A
20 A
40 A
30 A
40 A
50 A
DIMENSIONS, W x H x L, inches
(mm)
11.5 X 2 X 8.25 11.5 X 2 X 9.25 11.5 X 2 X 12
11.5 X 2 X 12
11.5 X 2 X 15
11.5 X 2 X 15
11.5 X 2 X 17
(292 X 51 X 432)
11.5 X 2 X 19
(292 X 51 X 482)
(292 X 51 X 209) (292 X 51 X 241) (292 X 51 X 305) (292 X 51 X 305) (292 X 51 X 381) (292 X 51 X 381)
5.4 (2.45)
6 (2.72)
8.1 (3.66)
7.4 (3.35)
9.5 (4.3)
9.24 (4.2)
10.3 (4.66)
11.44 (5.2)
NET WEIGHT, LBS (KG)
Features and Specifications
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specs
3
2
1
1
2
Speaker Terminals
These terminals are 14K Gold plated for high conductivity
and minimum impedance loss. The terminals face
upwards for easy wiring in tight situations.
–
+
B R I D G E D
Fuse
Protects the amplifier as well as the automobile electrical
system from short circuit conditions.
V
1 2
G G N N D D
–
+
+
–
L
R
S U E F F U S E
R E M
Power Supply Terminals
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
setting of this control.
5
Crossover Mode Switch
In a full range system, set this to FULL. If the amp is
being used to power a crossover system, set to either
HPF or LPF as needed.
Bass Boost Control
Allows you to increase the bass signal level sent to the
speakers
6
7
8
9
Low Pass Control
Permits you to adjust the crossover frequency from 35
Hz to 400 Hz to suit the subwoofers
High Pass Control
Permits you to adjust the crossover frequency from
80 Hz to 2.5 kHz to suit the tweeters
High Level Input (Low Impedance)
Use these if your car stereo does not have
RCA output jacks: connect the speaker output from
the head unit to these inputs
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
Power LED Indicator
This LED is illuminated when the REMOTE ON
system is turned on.
11
12
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
the protection circuitry to become activated.
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.
To reset the amp, turn the REMOTE power off and on
again.
LOW IN
L
R
REMOTE
BASS BOOST
BASS
BOOST
HPF
LPF
FREQ.
LEVEL
R
L
Remote Bass Boost(LA480 Without)
Plug in the Remote Bass Boost Control wire in here.
PROTECT
POWER
13
MIN
MAX
80 2.5k
35 400
0
18db
H
2
H
2
HPFLPF
FULL
HI IN
13
12 11 8 7 6 5 4 10
9
Features and Controls
LA480/580/780/1480/1880/2080
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2
1
3
1 Speaker Terminals
These terminals are 14K Gold plated for high conductivity
and minimum impedance loss. The terminals face
upwards for easy wiring in tight situations.
–
+
B R I D G E D
–
+
B R I D G E D
Fuse
Protects the amplifier as well as the automobile electrical
system from short circuit conditions.
2
–
+
+
–
+
–
+
C H
–
V
1 2
G G N N D D
4
C H
3
C H
2
C H
1
S U E F F U S E
R E M
Power Supply Terminals
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
setting of this control.
5
Crossover Mode Switch
In a full range system, set this to FULL. If the amp is
being used to power a crossover system, set to either
HPF or LPF as needed.
Bass Boost Control
Allows you to increase the bass signal level sent to the
speakers
6
7
8
9
Low Pass Control
Permits you to adjust the crossover frequency from 35
Hz to 400 Hz to suit the subwoofers
High Pass Control
Permits you to adjust the crossover frequency from
80 Hz to 2.5 kHz to suit the tweeters
3
High Level Input (Low Impedance)
Use these if your car stereo does not have
RCA output jacks: connect the speaker output from
the head unit to these inputs
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
Power LED Indicator
This LED is illuminated when the REMOTE ON
system is turned on.
11
12
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
the protection circuitry to become activated.
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.
BASS
BOOST
BASS
CH4
CH2
LEVEL
FREQ.
LPF
HPF
HPF
LPF
BOOST
FREQ.
LEVEL
To reset the amp, turn the REMOTE power off and on
again.
CH4 CH3
HI IN
CH2 CH1
HI IN
MIN
MAX
FULL
MIN
MAX
0
18db 35 400 80 2.5k
80 2.5k 35 400
0
18db
LPFHPF
HPFLPF
FULL
CH3
CH1
H
2
H
2
H
2
H
2
REMOTE
BASS BOOST CH3/4
PROTECT
POWER
Remote Bass Boost
Plug in the Remote Bass Boost Control wire in here.
LOW IN
LOW IN
13
9
10 4 5
12 13 11
5 4 10
9
6 7 8
8 7 6
Features and Controls
LA680/1080
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REM
FFUUSSEE
Making Power Connections
CH1
CH2
CH3
CH4
GGNNDD
12V
+
–
+
–
+
–
+
–
1. Connect the +12V terminal directly to the car battery (+) terminal.
BRIDGED
–
BRIDGED
–
+
+
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
Electrical Connections
(all models)
12V battery
head unit
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 Wiring and Installation
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LA480
LA580
LA780
LA1480
LA1880
Low Level Stereo Input Connection
LOW IN
L
R
REMOTE
BASS BOOST
BASS
BOOST
HPF
LPF
FREQ.
LEVEL
R
L
PROTECT
POWER
MIN
MAX
80 2.5k
35 400
0
18db
H
2
H
2
HPFLPF
HI IN
FULL
LA2080
2CH AMPS
head unit
L/R audio outputs
5
PLEASE NOTE! If using high level
inputs, do not use the low level
RCA inputs at the same time!
High Level Stereo Input Connection
LOW IN
L
REMOTE
BASS BOOST
BASS
BOOST
HPF
LPF
FREQ.
LEVEL
R
L
PROTECT
POWER
R
MIN
MAX
80 2.5k
35 400
0
18db
H
2
H
2
HPFLPF
FULL
HI IN
wiring harness
head unit
L
L
R
R
orange
black
black
orange
from speaker terminals
Input Connections
inputs
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BASS
BOOST
BASS
BOOST
CH4
CH2
LEVEL
FREQ.
LPF
HPF
HPF
LPF
FREQ.
LEVEL
LA680
LA1080
CH4 CH3
HI IN
CH2 CH1
HI IN
MIN
MAX
FULL
MIN
MAX
0
18db 35 400 80 2.5k
80 2.5k 35 400
0
18db
LPFHPF
HPFLPF
CH3
CH1
H
2
H
2
H
2
H
2
FULL
REMOTE
BASS BOOST CH3/4
PROTECT
POWER
LOW IN
LOW IN
4CH AMPS
Low Level 4 CH Stereo Input
from 2 CH Audio Source
Left Output
head unit
Right Output
Y adaptors
BASS
BOOST
BASS
BOOST
CH4
CH2
LEVEL
FREQ.
LPF
HPF
HPF
LPF
FREQ.
LEVEL
CH4 CH3
HI IN
CH2 CH1
HI IN
MIN
MAX
FULL
MIN
MAX
0
18db 35 400 80 2.5k
80 2.5k 35 400
0
18db
LPFHPF
HPFLPF
FULL
CH3
CH1
H
2
H
2
H
2
H
2
REMOTE
BASS BOOST CH3/4
PROTECT
POWER
LOW IN
LOW IN
Low Level 4 CH Stereo Input
from 4 CH Audio Source
head unit
L + R Front Outputs
L + R Rear Outputs
Input Connections
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BASS
BOOST
BASS
BOOST
CH4
CH2
LEVEL
FREQ.
LPF
HPF
HPF
LPF
FREQ.
LEVEL
LA680
LA1080
CH4 CH3
HI IN
CH2 CH1
HI IN
MIN
MAX
FULL
MIN
MAX
0
18db 35 400 80 2.5k
80 2.5k 35 400
0
18db
LPFHPF
HPFLPF
FULL
CH3
CH1
H
2
H
2
H
2
H
2
REMOTE
BASS BOOST CH3/4
PROTECT
POWER
LOW IN
LOW IN
4CH AMPS
High Level 4 CH Stereo Input
from 4CH Audio Source
wiring harness
head unit
orange
black
black
orange
black
black
L
R
L
R
orange
orange
REAR
FRONT
7
BASS
BOOST
BASS
BOOST
CH4
CH2
LEVEL
FREQ.
LPF
HPF
HPF
LPF
FREQ.
LEVEL
CH4 CH3
HI IN
CH2 CH1
HI IN
MIN
MAX
FULL
MIN
MAX
0
18db 35 400 80 2.5k
80 2.5k 35 400
0
18db
LPFHPF
HPFLPF
FULL
CH3
CH1
H
2
H
2
H
2
H
2
REMOTE
BASS BOOST CH3/4
PROTECT
POWER
LOW IN
LOW IN
High Level 4 CH Stereo Input
from 4CH Audio Source
head unit
L
R L
R
orange
orange
black
black
black
orange
black
orange
REAR
FRONT
Input Connections
inputs
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LOW IN
L
R
REMOTE
BASS BOOST
BASS
BOOST
HPF
LPF
FREQ.
LEVEL
R
L
PROTECT
POWER
LA480
LA580
LA780
LA1480
LA1880
MIN
MAX
80 2.5k
35 400
0
18db
H
2
H
2
HPFLPF
FULL
HI IN
Bridged Input Connection
to a second
amplifier
head unit
LA2080
2CH AMPS
Y adaptors
BASS
BOOST
BASS
BOOST
CH4
CH2
LEVEL
FREQ.
LPF
HPF
HPF
LPF
FREQ.
LEVEL
CH4 CH3
HI IN
CH2 CH1
HI IN
MIN
MAX
FULL
MIN
MAX
0
18db 35 400 80 2.5k
80 2.5k 35 400
0
18db
LPFHPF
HPFLPF
FULL
CH3
CH1
H
2
H
2
H
2
H
2
REMOTE
BASS BOOST CH3/4
LA680
LA1080
4CH AMPS
PROTECT
POWER
LOW IN
LOW IN
4 CH Bridged Input
from 2 CH Audio Source
CH1+2 = Left Channel
CH3+4 = Right Channel
Left Output
head unit
Right Output
Y adaptors
Input Connections
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REM
FFUUSSEE
L
R
+
–
+
–
GGNNDD
12V
LA480
LA580
LA780
LA1480
LA1880
BRIDGED
+
–
Basic Stereo Output
LA2080
2CH AMPS
LEFT speaker
RIGHT speaker
9
REM
FFUUSSEE
CH1
CH2
CH3
CH4
GGNNDD
12V
+
–
+
–
+
–
+
–
LA680
LA1080
4CH AMPS
BRIDGED
BRIDGED
+
–
+
–
Basic 4CH Output
R
L
R
L
FRONT
speakers
REAR
speakers
Speaker Connections
speakers
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REM
FFUUSSEE
L
R
+
–
+
–
GGNNDD
12V
LA480
LA580
LA780
LA1480
LA1880
BRIDGED
+
–
Bridged Mono Output
MINIMUM
SPEAKER
IMPEDANCE
4 OHMS!
LA2080
2CH AMPS
speaker
REM
FFUUSSEE
CH1
CH2
CH3
CH4
GGNNDD
12V
+
–
+
–
+
–
+
–
LA680
LA1080
4CH AMPS
BRIDGED
BRIDGED
+
–
+
–
2 CH Mono-Bridged Output
speakers
MINIMUM
SPEAKER
IMPEDANCE
4 OHMS!
L
R
Speaker Connections
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REM
FFUUSSEE
CH1
CH2
CH3
CH4
GGNNDD
12V
+
–
+
–
+
–
+
–
LA680
LA1080
BRIDGED
BRIDGED
+
–
+
–
4CH AMPS
2 CH Stereo plus
Mono-Bridged
Subwoofer Output
speakers
MINIMUM
SPEAKER
IMPEDANCE
4 OHMS!
L
R
Mono
Subwoofer
11
TROUBLESHOOTING
Before removing your amplifier, refer to the list below
and follow the suggested procedures. Always test the
speakers and their wires first.
Amplifier will not power up.
• Check for good ground connection.
• Check that remote DC terminal has at least +12v DC.
• Check that there is battery power on the + terminal.
• Check all fuses.
• Check that Protection LED is not lit. If it is lit, shut off amplifier
briefly and then repower it.
Amplifier(s) gets very hot.
• Check that the minimum speaker impedance for that model
is correct.
High hiss or engine noise (alternator whine) in
speakers.
• Check for speaker shorts.
• Check that there is good airflow around the amplifier. In
some applications, an external cooling fan may be required.
• Disconnect all RCA inputs to the amplifier(s) – if hiss/noise
disappears, then plug in the component driving the amplifier
and unplug its inputs. If hiss/noise disappears, go on until the
faulty/noisy component is found.
• It is best to set the amplifier's input level as insensitive as
possible. The best subjective S/N ratio is obtainable this way.
Try to drive as high a signal level from the head unit as possible.
Distorted sound
• Check that the Level control(s) is set to match the signal
level of the head unit.
• Check that all crossover frequencies are properly set.
• Check for shorts on the speaker leads.
Protection LED comes on when the amplifier is
powered up.
• Check for shorts on speaker leads.
• Check that the volume control on the head unit is turned
down low.
• Remove speaker leads, and reset the amplifier. If the
Protection LED still comes on, then the amplifier is faulty.
High squeal noise from speakers.
• This is almost always caused by a poorly-grounded RCA
patch cord.
Troubleshooting
troubleshooting
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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
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
1600 63rd Street
IMPORTANT: Pack carefully in original carton if possible. We are not
responsible for damage incurred in returning items for repair. A letter
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.
Brooklyn, NY 11204
FOR YOUR PROTECTION
Completely and immediately mail the Product Registration Card
so that we may contact you directly in the event a safety
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.
1-800-934-2277
Monday through Thursday, 9AM to 5PM
Friday 9AM to 2PM Eastern.
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