posted
I just installed a eclipse 7001 screen, and have developed a horrible engine whine. My previous deck, an alpine 7939 did not have the same problem. I was wondering if anybody here has worked with the 7001 and had the same problem. I tried the usual stuff to eliminate it, move ground, try new rca's, ground loop isolator, but to no success. Any help would be appreciated.
posted
the car is a 1993 suburban.The brain is under the drivers seat, changer under passangers. Rca runs from passanger side crosses under middle row of seat to driver, changer cord also goes underneath middle row carpet. Power, ant and din cord all run from deck down the drivers side. Vcr is straight back from brain. The rca goes to an audiocontrol 24xs which goes to a memphis 3004 and 1000d. Power is 1/0 run under car. This noise problem did not exist before I swaped the decks.
posted
Assuming that the noise is present in all sources, and the power cable to the "brain" isn't the cause then follow these steps given to us by Mabeita in the troubleshooting section, and substitute the EQ part for your crossover. To properly isolate the point of entry for alternator noise, you should follow the following steps, as they apply, for each component in the system. Begin with the amplifier(s) that has the noise and work towards the head unit, be sure to have an extra RCA cable, or two, on hand for the testing, as well as a pair of muting plugs. Muting plugs are RCA ends that have the shield and the center conductor connected together, high end home equipment usually comes with these, they are used on input sections that do not have source units connected to them. When installed, these plugs guarantee that the empty input will allow no audio activity(hiss, pop, static),noise if you will.
Amplifier: 1.) Isolate the unit from chassis ground, remove all mounting screws that connect the unit to the vehicle and check for noise(cfn). 2.) Mute the inputs(cfn). 3.) Use alternate power supply(cfn).
Rca's: 1.) Substitute the patch cord(cfn), just to be sure that there is no possibility that the noise is coming in through the RCA's. Use a different RCA, connect directlty form the amp to the EQ, don't bother running the cable under the carpet, you're only doing this to verify that you're cables are good. If this corrects the problem, then you replace the original connectors.
Equalizer: 1.) Isolate the unit from all contact with the chassis(cfn), including the chassis of other units(deck). 2.) Mute the inputs to the EQ(cfn). 3.) Use alternate power supply(cfn). 3.) Simplify the system(cfn), bypass the EQ and connect the amp directly to the head unit.
Also, what HU did you have before? You may need to change the configuration of the inputs to the crossover to compensate the change of headunits and the difference of the preouts.
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Posts: 515 | From: Omaha NE, USA | Registered: Nov 2000
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