User manual AUDIO DESIGN LA-4200

[. . . ] Be careful not to cut or drill into gas tanks, fuel lines, brake or hydraulic lines, vacuum lines or electrical wiring when working on any vehicle. ⷠAftermarket amplifiers will put an increased load on the vehicle's battery and charging system, which can reduce battery and alternator life. It is strongly recommended to upgrade your factory alternator and battery for optimum performance from your new audio system. Choose a mounting location that will be secure and offer plenty of unobstructed space for proper cooling. [. . . ] connect the other end of the REM wire to a switched 12-volt positive source. NOTE: The switched voltage is usually taken from the source unit's accessory/remote lead. Connect the source signal to the amplifier by plugging the RCA cables/high level inputs into the input jacks at the amplifier. NOTE: When using High Level Inputs, if audible engine noise is present, connect the Black wire to chassis ground. If noise is still present, contact your local authorized dealer or Lightning Audio customer service. Strip the speaker wires 1/2" and insert into the speaker terminal and tighten the setscrew to secure into place. Be sure to maintain proper speaker polarity. DO NOT chassis ground any of the speaker leads as unstable operation may result. Check all power and ground connections for frayed wires and loose connections. Complete the installation by installing the proper value fuse. Operation Adjusting Level: To adjust the level setting, turn the amplifier gain level to the lowest setting. Turn the source unit volume up until distortion is audible and then slowly down until the distortion is inaudible (approximately ¾ volume position). Next, increase the amplifier level setting until once again distortion is audible and then down slowly until the distortion is inaudible. NOTE: Proper level setting is done by a trained professional utilizing an oscilloscope. With the system playing at normal listening level, turn the crossover adjustment knob up slowly until the desired crossover point is achieved. Example: subwoofers- low pass with an 80Hz crossover point and full-range- high pass with a 100Hz crossover point NOTE: Some models include a subsonic filter with a variable 15-40Hz high pass filter designed to prevent frequencies below the audio range from being applied to the subwoofer from the amplifier. Set this to your personal preference while listening to the system. Amplifier does not turn on B+ or REM not between 10. Repair as necessary Amplifier Noise Amplifier is not properly grounded Check wiring and repair as necessary Turn-On Pop Voltage spike from source unit is entering amplifier's input Connect a relay turn-on module to REM terminal if pops are eliminated with no input signal to amplifier Engine Noise Noise is radiating into signal cables Re-route signal cables away from sources of high current Lightning Audio offers a limited warranty on products subject to the following terms: Length of warranty: Speakers - One year replacement warranty from date of original purchase - requires proof of purchase. Amplifiers - One year replacement warranty from date of original purchase - requires proof of purchase. [. . . ] ⷠHow to obtain service Defective products should be returned to your local authorized Lightning Audio Dealer for warranty service or, you may call 1-888881-8186 for Lightning Audio customer service. You must obtain an RA# (Return Authorization number) prior to returning any product to Lightning Audio. Return Authorizations are valid for 30 days. You are responsible for the shipment of defective product to Lightning Audio and you MUST include valid proof of purchase. [. . . ]