valutazioni - 6, GPA: 3.8
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The voltage should measure between 11.5V - 15.5V. If voltage is notfound, check the battery, fuse, fuse housing and wire connections. Fix, repair, or replace accordingly. 2. If the amplifier still does not play, check the voltage at the amplifier’s remote turn-on lead. The voltage should measure between 11V - 15V. a. If voltage is above or below the prescribed measurements, check for proper connections and have the head unit checked by an Authorized Dealer or Service Center. b. If the remote turn-on current draw from the head unit is connected to multiple amps and/or electronics, the current draw may be too great. Check for proper connections. (Use a relay to suppress the excessive current draw.) Problem Amplifier will not play — Remote Turn-on light is on: Solution 1. Unplug the head unit and test the amplifier with another working source unit (i.e., bench-test radio, walkman, etc.). If the amplifier plays, check the in-dash leads for cuts, breaks and/or shorts. 2. If the amplifier still does not play, disconnect the existing speakers and connect a set of test speakers to the output of the amplifier (any type of speaker will do - i.e., simple home box type, bookshelf, raw speaker, etc.). If the amp plays, check for shorts or blown voice coils in the vehicle’s speaker system. –17 – Problem Amplifier gets too hot. Solution 1. Be sure the amplifier is properly mounted. You should be able to place your hand a few inches above the amplifier housing and feel the heat rising when the unit is on. Hot air rises. Consequently mount the amplifier with the heatsink fins aligned vertically. This allows the air to flow freely, carrying away the heat. Check to see that the heatsink fins are free of any obstruction (i.e., carpet, seats, etc.). 2. If #1 does not solve the problem, check to see that the impedance of the overall system is not less than 2. stereo or 4. bridged/ mono. Using an AC impedance meter (such as the Perfect Interface IM-1), sweep from 20 Hz-20 kHz, and look for dips below 2.. Be sure to test the bass region (20 Hz - 150 Hz) of your system. If the amplifier is bridged to those speakers, the load the amp sees is one-half (1/2) of the reading on the AC impedance meter. If the impedance level is below 2., check for a bad speaker and/ or crossover, proper usage of passive crossovers or shorted wires, or try rewiring the entire system. Problem Amplifier noise (Turn-On Pop) Solution 1. Disconnect the RCA plugs from the amplifier and recheck the amp by turning it on and off with the source unit. If turn-on pop goes away, connect a delay turn-on module (Perfect Interface DT-1) to the amplifier. See your Authorized Rockford Fosgate Dealer for more information. 2. If the noise persists, disconnect the turn-on wire from the head unit and use a different +12 volt power source to turn on the amplifier (i.e., battery direct). If the noise is gone, use a relay to switch +12 volts auto power from the clean power source. – 18 – Problem Engine Noise (Whine) Solution 1. Disconnect the speakers from the amplifier. Connect a test speaker to the amplifier output terminals. If the noise goes away, check your speaker leads, speakers and crossovers. 2. If the noise persists, use a “shorting plug” to mute the input signal at the amplifier. If the noise goes away: a. Bypass all of the other equipment (i.e., crossovers and equalizers) and connect the head unit directly to the amp. If the noise disappears, reconnect the equipment one piece at a time, being sure to test for noise after each piece is installed. Logic indicates that the last unit installed when the noise returns is the culprit. Refer to the unit’s owner’s manual for more information. b. If the noise persists, run a new RCA line from your head unit to the amplifier. If there is no noise, replace the RCA cable. c. If the noise is still present after replacing the RCA cable, run the RCA cable on a different route. d. Isolate the grounds on the head unit so that there is only one grounding point. If the noise disappears, install the radio, using only one (1) grounding point. Isolate the radio chassis from the grounding on the dash, and use an antenna grounding loop isolator on the antenna. If noise persists, see your Authorized Rockford Fosgate Dealer. – 19 – DYNAMIC POWER MEASUREMENTS About the Dynamic Power Measurements The Audio Graph PowerCube is a test instrument used to measure the output of an amplifier. It makes measurements in accordance with IHF202 standards. The IHF-202 standard is a Dynamic power measurement. It was developed as a means of measuring power in a manner that best represents the Real World operation of an amplifier. Many manufacturers, including Rockford Fosgate, at times will measure amplifier power into a fixed resistor (4 Ohm, 2 Ohm). While this method is useful in some types of evaluation and testing, it is not representative of an amplifier that is hooked up to a speaker and playing music. Music Music is dynamic; sound waves are complex and ...
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