Assessments - 2, GPA: 3 ( )

Fabricante : Legacy Car Audio Arquivo Tamanho: 1.07 mb Arquivo Nome : Língua de Ensino:

• This is almost always caused by a poorly-grounded RCA patch cord. 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 amplifier. 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. 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. 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. • 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. 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. Speaker Connections troubleshootinTrougbleshooting 2 CH Mono-Bridged Output Bridged Mono Output speakers L R MINIMUM SPEAKER IMPEDANCE 4 OHMS! STOP YES! NO! 2-c hannel Ampl i f ier (Operating in Stereo) 4 ohm 4 ohm Two 4-ohm speakers, wired in stereo, will present a 4-ohm load to each channel of the amplifier. Most twochannel amplifiers will work well in this configuration. 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! sound around, Inc. 1600 63rd street. brooklyn. ny 11204 4 ohm 4 ohm 2-c hannel Amplifier (Operating in Bridged Mono) STOP YES! NO! Four 4-ohm speakers, wired in stereo, will present a 4-ohm load to each channel of the amplifier. Most fourchannel 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! sound around, Inc. 1600 63rd street. brooklyn. ny 11204 4-c hannel Amplifier (Operating in Bridged Mono) 4 ohm 4 ohm 4 ohm 4 ohm 4-c hannel Amplifier (Operating in Stereo) 4 ohm 4 ohm 4 ohm 4 ohm 2CH AMPS LA438 LA538 LA738 LA938 LA1438 LA1838 LA2038 11 4CH AMPS LA638 LA838 LA1038 4CH AMPS LA638 LA838 LA1038 2 CH Stere...

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