Question about Car Audio Receivers

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Volume fade Hello. I recently purchased an 82 Lincoln - great car, except for the factory 8 track player. Installed a new Pioneer DEH-3000IB head unit and system worked great, except the (rear) factory speakers sounded terrible - very distorted at any volume. I replaced the rear speakers (front ones sounded fine) with new Sonys. System sounds fantastic and works like a charm for about 30 minutes. After that, the volume quickly starts to fade down to nothing (any source). If I turn the unit off then back on, the system sounds great again for about 5 minutes then fades. Turn off then on, 5 minutes until fade... and so on. It does not matter the volume I am listening or speed I am traveling. I am thinking this could be due to overheating, but I feel the unit and it is warm, normal warm, no where near "hot" and when I turn off/on, it comes right back on good as new... for 5 minutes. Any advice?

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  • quantux84 Mar 14, 2009

    Almost my same problem except for a few differences. I have a Lincoln LS 2003 with an unmodified factory THX soundsystem. Earlier this month i was listening to the radio turned up pretty loud until one day as i was driving, the radio system just shut down and i was in silence the rest of my commute. The following day I could not turn up the volume past 10% before fading slowly into a silence. Now it gets interesting. My car has a set of 10 speakers; 2 on each door ( midrange and tweeters ), a total of 4 doors and 2 rear speakers. My car is designed so that a dedicated amp supplies power to the 2 rear speakers and a second amp for the doors and navigation system. If I unplug the amp to the speakers on the doors, i can turn up the volume perfectly fine on the radio. Which means i can listen only to the bass coming from the 2 rear speakers. As soon as I plug in the amp for the doors the problems returns and fades across all speakers equally. Hoping it is not the amp, Is there another component in the car, relay, switch, fuse that aids with the amplifier power I should look in first? If so what is it?  

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Check to be sure there are no speaker wires touching ground, and that the wires are connected in phase to the head unit.
Front Speakers 5 1/4" Doors Left Front (+) Green Left Front (-) Black/White Right Front (+) White/Red Right Front (-) Black/White Rear Speakers 6" x 9" Rear Deck Left Rear (+) Pink/Red Left Rear (-) Pink/Blue Right Rear (+) Pink/Light Blue Right Rear (-) Green/Red

The symptoms you are relaying definately sound like an internal amplifier problem. It is fading in and out for a reason - usually due to heat.

Have you had the radio bench tested (seperate from the car) to eliminate the car as being the culprit?

Since the radio was run with damaged speakers originally, the output or amplifier power supply on the amplifier may be bad.

As an alternative to repairing, I would suggest investing in a small 2 channel amplifier to power the speakers.

The radios claim 50W per channel, but in reality give 12-15W RMS power.

A dedicated amplifier with built in crossovers and gain adjustments will prolong the life of your speakers and add to the tonal qualities of your new speakers. Instead of turning up the volume on the head Unit, and sending out a distorted signal that will blow your speakers, an amplifier will give more CLEAN power to them, so it will be louder at a lower volume setting.

This will bypass the internal amplifier on the radio, and send a Low Level signal ONLY thru a set of RCA cables.

Good Luck!!

Posted on Jan 10, 2009

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