Legacy Car Audio LA-1478 Car Amplifier User Manual
Contents
1. c A ee AW M A A ee M AAA eee D e e ewe oo Speaker Output Connection tamm MI NI MUM SPEAKER IMPEDANCE subwoofer 2 4 OHMS Input Connections SpeakersGonnection Amplifier will not power up Check for good ground connection e Check that remote DC terminal has at least 2v DC e 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 High hiss or engine noise alternator whine in speakers 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 e Itis 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 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 Amplifier s gets very hot Check that the minimum speaker impedance for that model is correct Check for speaker shorts Check that there is good airflow around the ampl2. 16V 2 4 OHMS 4 8 OHMS 15A 12 2X2 X 8 25 309 X 53 X 209 SEDIS LA 678 4CH amplifier 250W 250W 500W R2X500W 2 4 OHMS 4 8 OHMS 20A 122X2X12 309 X 53 X 305 17 7039 LA 778 2CH amplifier 75W 125W D 2 X 2 X 2 X 1 X 1000W 2 4 OHMS 4 8 OHMS 20 A 12 2 X2 X12 309 X 53 X 305 7 6 3 46 LA 878 4CH amplifier X 50W X 60W X 400W X 400W 800W 4 4 4 2 oR 2 X 800W 2 4 OHMS 4 8 OHMS 40 A 112 2 2 22 10 309 X 53 X 381 9 1 4 4 Features and Specifications Legacy American Amplifier Features LA 2478 also feature Mono Block Subwoofer Amplifier 2 Ohm Stable MOSFET Power Supply Gold Plated RCA Inputs for Line Input amp Bypass Output Gold Plated Terminals for Speaker Output and Power Input Thermal Overload and Short Protection Variable Sub sonic Filter IbHz 40Hz 24dB Octave Variable Low pass Filter 20Hz 250Hz 24dB Octave Specifications OUTPUT POWER RMS 4 OHMS RMS 2 OHMS MAX OUTPUT BRIDGE MODE FREQUENCY RESPONSE INPUT IMPEDANCE LOW LEVEL INPUTS HIGH LEVEL INPUTS INPUT SENSITIVITY LOW LEVEL INPUTS HIGH LEVEL INPUTS POWER SUPPLY VOLTAGE MATCHING SPEAKER IMPEDANCE STEREO MODE BRIDGED MODE MAXIMUM CURRENT DRAW DIMENSIONS W x H x L inches mm NET WEIGHT LBS KG LA 973 LA 1478 2CH amplifier 2CH amplifier 2 X 100W 2 X 125W 2 X 150W 2 X 200W 2 X 600W 2 X 800W 1X1200W 1X1600W 10Hz 30 kHz 10
3. CD s and recordings Used properly these amplifiers will provide you with years of listening pleasure table of contents SPECIFICATIONS LA 478 578 778 978 1478 1878 2078 2278 FEATURES amp CONTROLS LA 678 878 FEATURES amp CONTROLS LA 2478 FEATURES amp CONTROLS ELECTRICAL WIRING INSTALLATION amp SETUP 2 CH STEREO INPUT CONNECTIONS 4 CH STEREO INPUT CONNECTIONS BRIDGED INPUT CONNECTIONS BASIC STEREO SPEAKER CONNECTIONS MONO BRIDGED SPEAKER CONNECTIONS MONO BLOCK INPUT amp SPEAKER CONNECTIONS TROUBLESHOOTING Legacy Ame 14 ey J 9 60 20 e Soft turn on off circ e Variable gain control e Remote turn on off Hi low level inputs e Power on LED indicator LED protection indicator Specifications OUTPUT POWER RMS 40HMS RMS 2 OHMS MAX OUTPUT BRIDGE MODE FREQUENCY RESPONSE INPUT IMPEDANCE LOW LEVEL INPUTS HIGH LEVEL INPUTS INPUT SENSITIVITY LOW LEVEL INPUTS HIGH LEVEL INPUTS POWER SUPPLY VOLTAGE MATCHING SPEAKER IMPEDANCE STEREO MODE BRIDGED MODE MAXIMUM CURRENT DRAW DIMENSIONS W xH x L inches mm NET WEIGHT LBS KG Fully adjustable electronic crossover network e Remote control Bass boost 0 18dB 60Hz 2 ohm stereo stable Bridgeable into 4 ohms MOSFET PWM power supplies LA 478 2CH amplifier 10Hz 30 kHz 10 k Ohms 100 Ohms 250 mV 2 5V LA 578 2CH amplifier OW 5W 00W 0 2 2 2 1 OW X5 X 7 X4 X8 14 4 VDC NEG GD 10 5
4. turnon off This may be connected to the head unit power antenna lead all models to remote turn on 12V head unit 12V battery Installation Precautions vum 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 e 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 e 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 f 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 d
5. 00 in 000 000000 MN 0000000 A Level 4 CH Stereo Input 4CH Audio Source non ground connection orange orange REAR FRONT Input Connections g 0 2000000020 d 0000000000 tamm Ac LEFT speaker RIGHT speaker Mess 0 000000000 Roin am t um FRONT R L REAR speakers speakers Basic Stereo Output 2CH AMPS 4CH AMPS Basic 4CH Output Speaker Connections n e 0 0 0 0000 000000 070000009 2 00 00000000000 HB Lxx ol 0000 Bridged Mono Output MINIMUM SPEAKER Sue PES I MPEDANCE speaker 4 OHMS m ACH AMPS 2 CH Mono Bridged Output tam speakers am MINIMUM SPEAKER L I MPEDANCE R 4 OHMS 000 nity 00000000 000000 0 Ku 0000 2 CH Stereo plus M ono Bridged Subwoofer Output um am speakers Gad 4a MINIMUM peni I MPEDANCE Subwoofer 4 OHMS Speaker Connections Low Level Stereo Input Connection MONO CHANNEL AMPS 0000000 pi 00 0 00000000000 3 LEGACY L R Audio Outputs TO SATELLITE AMPLIFIER LINE INPUT 00 aS iy 0 Se 1
6. Features and controls 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 Fuse Protects the amplifier as well as the automobile electrical system from short circuit conditions Power Supply Terminals 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 Phase Shift Switch Allows you to change the phase of your subwoofer from O degree to 180 degrees to help compensate from timing difference between drivers High Pass Subsonic Filter Adjustable from 15Hz to 40Hz with a slope of 24dB per octave This allows for the attenuation of frequencies that are mostly inaudible and cause unnecessary strain on the amplifier Crossover Low Pass Filter Adjustable from 20Hz to 250Hz with a slope of 24dB per octave This allows for the adjustment of the upper point of the frequency bandwidth and the respective subwoofer 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 Output High Impedance This unit is provided with gold plated RCA Output jacks Using RCA RCA type patch cords connect these Outputs to the RCA Inputs for your anyther amplifier Protection LED Indicator
7. MANUFACTURER S LIMITED TWO YEAR VVAR FR AINT Y 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 IMPORTANT Pack carefully in original carton if possible We are not LEGACY SERVICE CENTER responsible for damage incurred in returning items for repair A letter LA Eee A EA FA LA 9 14 18 2 22 2 4 _ vire MANUAL 1600 63rd Street stating your exact street address daytime phone number and the Brooklyn NY 11204 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 co
8. 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 Power LED Indicator This LED is illuminated when the REMOTE ON system is turned on 12 Remote Bass Boost Plug in the Remote Bass Boost Control wire in here __ _ _ _______ Making Power Connections SS a B U 1 Connect the 12V terminal directly to the car battery terminal 0000000 00 2 Connect the GROUND terminal directly to the car battery terminal 00000 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 Electrical Connections
9. el inputs do notuse the low level RCA inputs at the same time SO 0000 0000000 0 00000000 2000 0 000 0 0 0 0 _LE 5 Se RR wiring harness head unit orange orange from speaker terminals 2CH AMPS Input Connections E IE 1 0 0709000 0000 0 900020000 070000 4CH AMPS 0 0 0 Low Level 4 CH Stereo Input from 2 CH Audio Source to a second amplifier 2CH AMPS head unit head unit 8 f 5 Iran aerate Left Output Y adaptors Y adaptors EGGACY mme ES 5 000 D x m X et mas 000 0 s 4CH AMPS 00g o 00000 gii 00090 Oat 000 0 000 0900 4 CH Bridged Input from 2 CH Audio Source CH142 Left Channel CH344 Right Channel Low Level 4 CH Stereo Input from 4 CH Audio Source Left Output head unit Right Output Y adaptors Input Connections Input Connections 4CH AMPS LEGACY 0 uum 10 il eee oe eo eo oe oe x High Level 4 CH Stereo Input frorn 4CH Audio Source floating ground connection orange black black orange REAR FRONT 0 0
10. ifferent 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 Low Level Stereo Input Connection 0 000 000 0000 00000 hed i bs 00 0 o 0 0 0 L R audio outputs High Level Stereo Input Connection PLEASE NOTE fusing high lev
11. ifier In some applications an external cooling fan may be required 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 High squeal noise from speakers This is almost always caused by a poorly grounded RCA patch cord Led 2 channel Amplifier Operating in Bridged Mono 2 channel Amplifier Operating in Stereo Two 4 ohm speakers wired in parallel to a bridged two channel amplifier will present a 2 ohm mono load to the amplifier MOST TWO CHANNEL AMPLIFIERS DO NOT SUPPORT 2 OHM MONO OPERATION AMPLIFIER DAMAGE COULD RESULT Two 4 ohm speakers wired in stereo will present a 4 ohm load to each channel of the amplifier Most two channel amplifiers will work well in this configuration Sound around Inc 1600 63rd street brooklyn ny 11204 4 channel Amplifier 4 channel Amplifier Operating in Stereo 4 Operating Bridged Mono Four 4 ohm speakers wired in stereo will present a 4 ohm load to each channel of the amplifier Most four channel amplifiers will work well in this configuration Four 4 ohm speakers wired in parallel to a bridged four channel amplifier will present a 4 ohm mono load to the amplifier MOST FOUR CHANNEL AMPLIFIERS DO NOT SUPPORT 2 OHM MONO OPERATION AMPLIFIER DAMAGE COULD RESULT Tr
12. k Ohms 100 Ohms 250 mV 2 30 14 4 VDC NEG GD 10 5 16V 2 4 OHMS 2 4 OHMS 4 8 OHMS 4 8 OHMS 30A 30A 12 2 X 2 X 13 3 12 2X2X15 309 X 53 X 343 309 X 53 X381 8 2 3 73 8 8 4 0 Features and Specifications Phase Control 0 180 degree Remote Bass Control Input Impedance 10K Ohms Soft Turn On Off Advanced Protection Circuitry S N Ratio 290dB LA 1878 2CH amplifier 150W 225W 1000W 2X 2X 2X 1 X 2000W 2 4 OHMS 4 8 OHMS 40 A 12 2 X2 X 17 309 X 53 X 432 10 1 4 62 LA 2078 LA 2278 2CH amplifier 2CH amplifier 2 X 200W 2 X 300W 2 X 2 X 450W 2 X 1200W 2 X 2000W 1X2400W 1X4000W 2 4 OHMS 2 4 OHMS 4 8 OHMS 4 8 OHMS 50A 70A 12 2X 2 X 18 12 2 X 2 X 20 309 X 53 X 482 309 X 53 X 532 11 4 5 2 12 8 5 8 LA 2478 Mono channel amplifier 200W mono 335W mono 2000W mono 20 250Hz 3dB 10 k Ohms 100 Ohms 250 mV 4V 14 4 VDC NEG GD 10 5 16V 2 OHM STABLE 40 A 12 2 X2 X12 309 X 53 X 305 7 3 3 34 01 7770 5 Ah 1000 Wall 2 Channel Bridgeable MOSFET Ampiitier Features and Controls d 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 Fuse Protects the amplifier as well as the automobile electrical system from short circuit conditio
13. l 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 Remote Bass Boost Plug in the Remote Bass Boost Control wire in here 1000 Wall d Channel Bridgeable MOSFET Ampiitier 00000 LEGACY Ne 0 E Features and Controls e Speaker Terminals These terminals are 14K Gold plated for high conductivity minimum impedance loss The terminals face upwards for easy wiring in tight situations Fuse Protects the amplifier as well as the automobile electrical system from short circuit conditions Power Supply Terminals 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 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 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 f
14. ns Power Supply Terminals 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 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 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 Power LED Indicator This LED is illuminated when the REMOTE ON system is turned on 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 therma
15. ntact 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 0 N O UI A 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 1 800 934 2277 service situations Monday through Thursday 9AM to 5PM Friday 9AM to 2PM Eastern LEGACY WwW legqgacycaraudio com NNNNNNNNNNN CO 00 CO CO CO CO OO CAR PAM A D ere On Ir C ane ngratulations a z Legacy amps are some of the most advanced car amplification products available These quality audio products are designed and engineered to afford you years of uncompromised musical service Legacy has utilized the latest electronic technologies in order to deliver a superb listening experience This innovative system has been designed utilizing a 12 V DC Negative Ground power supply The Legacy American Series 2 amps incorporate two to eight MOSFETS in the different models This design produces enough available voltage to supply the main amplifier sections and still have a huge amount of reserve voltage for peak high demand situations The Legacy line has been designed to ensure adequate headroom for even the most demanding peaks and dynamic ranges found on today s
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17. rom 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 Power LED Indicator This LED is illuminated when the REMOTE ON system is turned on 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 Remote Bass Boost Plug in the Remote Bass Boost Control wire in here 09 0000 ae 700000000 000000 2000 Wall Mono Block MOSFET Ampliticr Eie a n 2 OD cmm LEGACY OO MONU BLOCK HIMPLINER Se oe oe eo ee
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