Feed back from radio when I shut it off

Feed back from radio when I shut the radio off it is comming from the bass speaker.  I just added a sub and amp but when the radio is off I still get a noise from the speaker sub. What would cause this? it is fine when the radio is on. 

Could this have anything to do with me changing the factory single cd to a Factory 6 disc from ford?  Please help.  I put the single cd radio back in and it does not make the sound, but as soon as I put the 6 disc in it has feedback whe the radio is clicked off and I drive it echos and it comes from the bass speaker. 

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Feed back from radio when key turned off.... I just added a sub and amp but when the radio is off I still get a voom noise from the speaker sub. What would cause this?

I'm sure it is not feedback, unless you have a microphone in your system.  I suspect either your gain is way too high or the signal to the sub amp is bad - are you using the speaker level inputs to the amp?  Are you using a LOC?

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I added an after market sub and amp to my single disc with tape deck  ford factory radio, it works great, but then I changed to a factory ford pioneer six disc stereo and I am getting the loud gain noise.  I never got that from the other stereo.  If I turn the gain down I lose bass and the noise, but I want bass. 

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Feed back from radio when key turned off.... I just added a sub and amp but when the radio is off I still get a voom noise from the speaker sub. What would cause this?

You must match the gain to the output from the head unit.  When a head unit (or anything else in the signal chain) changes, amplifier gain(s) must be reset to match.  There's your problem, it needs to be set correctly.  Use the SEARCH function for "gain" in the topic and there are several short tutorials on this forum.

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I thank you very much for your help.  I am new and this really means a lot.  I have been trying for the past few days to figure this out.  It works correctly on the single disc factory cd player but not on the 6 disc factory player??  All the hook ups just plug right in as well.  Thank for the quick response to my listing. 

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Feed back from radio when key turned off.... I just added a sub and amp but when the radio is off I still get a voom noise from the speaker sub. What would cause this?

The voltage output from the two head units will be different.  The amp must be matched to the one you use.  It is normal.

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If I turn the gain down I lose bass and the noise, but I want bass.  Could this have anything to do with the radio having some thing different inside?  I works fine with the single cd radio. 

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Feed back from radio when key turned off.... I just added a sub and amp but when the radio is off I still get a voom noise from the speaker sub. What would cause this?

shawn9766 wrote:

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If I turn the gain down I lose bass and the noise, but I want bass.  Could this have anything to do with the radio having some thing different inside?  I works fine with the single cd radio. 

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NO it has to do with the gain.  You must turn it down.  Actually you must set it properly to match the head unit.  If you do not understand this then I suggest you need to go to a shop and get some help.

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Sorry,  I will go do as you stated and see someone at a shop.  thank you for all the assistance. 

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Feed back from radio when key turned off.... I just added a sub and amp but when the radio is off I still get a voom noise from the speaker sub. What would cause this?

OK here is the deal,  Thanks for your help, but I think I had abit of a different problem.  I bought a six disc stereo factory radio  because I had a factory single disc.  The single disc does not make the noise and allows mwe to turn the gain all the way up for maxxx bass.  BUT, the six disc will not allow me to move the gain past 1/4 quarter.  If I go past 1/4th quarter it gives me feedback when turned off....  WHY???????  Is the factory wiring for these much different possibly if so can it be corrected?  thanks

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Feed back from radio when key turned off.... I just added a sub and amp but when the radio is off I still get a voom noise from the speaker sub. What would cause this?

First off, please do not post multiple threads with the same question.  Thanks.

Now I've already answered your question, but let me try again.  Every head unit produces a different level output.  No two - not even two of the make and model - will be exactly the same.  An outboard amplifier has a gain control so that you can match it's input sensitivity to the output from your head unit.  SO, like I said before, an amplifier's gain setting will be different for every head unit, and there is nothing wrong with any of your gear that causes this, it is the nature of car audio equipment.  If you have the input gain too high on an amplifier it can overload the input stages and cause it to oscillate or make strange noise.

NOW, you have several problems going on here that make your installation difficult.  You are using factory head units, which are normally low to mid-level quality and not designed for adding outboard amplifiers easily.  This means you are using the speaker-level signals, which can be clipped, noisy and have unknown EQ added to them from the factory head.  Also, you are trying to use a factory CD-changer that did NOT come with your car, which can cause other problems that you may not even be able to predict...

How is the signal from the CD-changer getting to your amp?

Is your amp properly grounded?

And lastly, and man I hope I don't have to keep posting this, but something tells me it will remain the most common thing I write for many more years, AMPLIFIER GAIN IS NOT A VOLUME CONTROL!  It is to be set to match the head unit and left alone.  Any gain setting from all the way left to all the way right may be the CORRECT setting, depending on the head and input voltage levels.  1/4-way is probably the CORRECT setting (or as close to it as you seem able to accept) for your setup.  If this means you "don't get enough bass," then hey, it's time for new equipment as you cannot get blood from a stone.  I suggest the FIRST thing you do is go to a good car stereo shop in your town and buy a new head unit.  Pay for professional installation and amplifier matching, and then don't F**K with it!  If it's still "not enough bass," then you will know you also need a different subwoofer setup.

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Hey,  I thank you once again for all the help, but I now have the actual answer.  The actual wire for the two units are a bit dif.  There were two wires set differently for this model.  You are correct that the gain will solve the problem, but it really was not the solution.  I have all the radio wire diagrams and I seriously can say that I feel like I have gained the proper knowledge now to know what and where things went wrong. 

Once again thank you and Sorry for the multiple listings, but I am new and was familliar with the forum.  :)

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Feed back from radio when key turned off.... I just added a sub and amp but when the radio is off I still get a voom noise from the speaker sub. What would cause this?