I have a Rockford Fosgate system in my Nissan Titan. Recently i have noticed that the base from the sub is way higher than normal on FM radio stations, but seems to be normal when in CD mode. Any Ideas?
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The sub was part of a Sony DAV-X1. This whole system is highly proprietary in its connections for a reason. For all anyone knows, the original amp's output was frequency-shaped to correct for speaker response issues, like Bose would do. Substituting a different amp may be electrically unwise and audibly unsatisfying. It is certain that the DAV base unit did all the electronic magic to create a surround effect from only 2 speakers and a sub.
Your best bet to put these speakers to use would be to examine the sub and speakers for two conductors each that would be for the amplifier's audio output. Measured across them wit han ohmmeter it would read somether around 6 ohms.
Then somehow craft a physical connector to carry an amp's speaker output to it and carefully test it with very low volume.
Turn the sub on, then touch the end of the sub lead when you take it out of the back of the amp..it should buzz to show the sub is ok . If the sub is ok then go through the setup on the Yamaha and tell it there is a sub connected in the speaker setup.
It most likely has a blown channel. It is going into the protect mode. If you have a multimeter I can guide you thru the process of figuring out which channel is blown and how to repair it. It will require, as noted above, a multimeter as well as a soldering iron, solder, solder wick and then the purchase of the bad parts. If you do not have this equipment there is no way for you to fix this yourself. You can always take it to a service center for repair if you are not able to do it yourself.
I have fixed many Fosgate amplifiers and can assure you there is no easy fix for your amplifier. It will require the replacement of parts.
Let me know if you are willing to try it yourself and I will help you as much as possible.
Check your amps ground and make sure it has a clean connection to the chasis. If there is paint or any kind of coating where you are trying to ground, use a steel brush to expose the bare metal. Also, make sure you are grounding the amp directly to the chasis and not to another grounded wire.
You will need a line level adaptor to get an audio input for the amp.
A line level adaptor is a device that lets you tap off of your speaker outputs of the radio and it converts that signal into the proper level for an RCA input signal the amplifier uses.
If you are installing the amp in the trunk of the car you can just tap off the speaker outputs of the rear speakers mounted in the trunk. Keep the speaker outputs connected to the speakers, just run an extra set of wires from them to the line level adaptor. It will not take anything away from the speakers sound because it is not a power drain on them.
After that, you just connect the power wires for the amp as you would normally and you also need to run an extra wire from the radio power antenna wire to the remote turn on of the amp, or you can use a wire directly from the battery and connect it thru a switch you would need to connect somewhere around the dash, so you can turn the amp on and off when you need to. The power antenna wire from the radio is best, so you don't need to turn the amp on and off manually. It is easy to forget about turning it off sometimes and that would run doen your battery if the amp is left on over night even with no signal going thru it.
Then connect your speakers to the amp and thats it.
Then big issue is getting an audio signal to the amp and the turn on signal for the amp.