Legacy Car Audio LA780 User Manual

LA480 LA1080  
LA580 LA1480  
LA680 LA1880  
LA780 LA2080  
HIGH SPEED  
CAR AMPLIFIER  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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.  
WWW.legacycaraudio.com  

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