Buzzing sound in stereo
Thread Starter
Launching!
Joined: Dec 2001
Posts: 210
Likes: 0
From: Homestead
Buzzing sound in stereo guys I am getting this buzzing sound in the stereo when the radio is on or off. It changes with the engine speed the pitch goes up. I checked and removed and cleaned any ground cables under the hood and it still does it .. Any ideas?
Re: Buzzing sound in stereo Ok guys I got to it this morning and fixed it. First I checked for any loose grounds and everthing seemed fine. I just retightened them. Then I moved all signal cables as far away from the power cable. These 2 things did not fix the problems but are very common cuases for noise. Well it turns out it was a loose RCA in back of my Alpine. For some reason it became loose. However, had tis not solved the problem, I would of proceded to replace the RCA with some better quality ones.
Back to your problem, do you mean you hear the buzzing sound when the radio is off or the engine is off. Because if you still hear when the radio is off that is new to me. Please elaborate more on this problem.
Back to your problem, do you mean you hear the buzzing sound when the radio is off or the engine is off. Because if you still hear when the radio is off that is new to me. Please elaborate more on this problem.
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TECH Resident
Joined: Aug 2003
Posts: 970
Likes: 4
From: England UK
Re: Buzzing sound in stereo I have the stock system and all is fine. But in my 3rd Gen firebird I would get this buzzing sound it was a loose RCA cable, also another cause was a loose ariel cable, that cable was screened also joined the radio to chassis ground which was also done though the wiring loom.
But if you radio is standard not too sure what it could be. There is surge supression inside the radio if not its in a box outside in the cable loom, if you remove that it would cause problems. If you look at your 12V when the engine is running with an occiliscope you will see huge voltage spiked although small in duration they to peek quite high, if this is not surpressed it will be passed onto the audio. Its not only GND that is important its the 12V too. If the regulation unit in the alternator is faulty you will get even larger voltage spikes with a longer duration if your radio is fine and this happenes it will be very hard for your audio system to surpress that.
Good luck in finding the fault.
But if you radio is standard not too sure what it could be. There is surge supression inside the radio if not its in a box outside in the cable loom, if you remove that it would cause problems. If you look at your 12V when the engine is running with an occiliscope you will see huge voltage spiked although small in duration they to peek quite high, if this is not surpressed it will be passed onto the audio. Its not only GND that is important its the 12V too. If the regulation unit in the alternator is faulty you will get even larger voltage spikes with a longer duration if your radio is fine and this happenes it will be very hard for your audio system to surpress that.
Good luck in finding the fault.
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Teching In
Joined: Oct 2005
Posts: 1
Likes: 0
I am a factory trained tech for Toyota (pays bills) and I have seen this once or twice. Turns out if was RFI or radio frequency interference. There are fiberglass strands in the spark plug wires to reduce RFI. The high voltage of the secondary could be causing your issue, as I have seen this happen before. On a side note, is this all the time or only in certain areas? Ive seen a problem where the trunk would pop open just driving down the road. Turns out after I drove the customers route it happened to be when you drove under the HV power lines. The RFI caused the trunk to pop.
the factory monsoon amp could also be going bad. regardless wether the radio is on. same thing happend to a customer of mine with a range rover. bad factory amp. but then again that was also with an alpine in the dash. i bypassed the amp and all was well.
Teching In
Joined: Jun 2007
Posts: 43
Likes: 0
From: Houston, TX
I'd like to hear the solution to this problem. My brother has an 1994 Honda accord with some cheapo Clarion deck. When the system is on or off there is not a problem UNTIL I decide to turn on the A/C, headlights or anything else that requires electricity. I wouldn't rule out that I hear the noise when the blinkers turn on and off.
Originally Posted by dark01ws6
I am a factory trained tech for Toyota (pays bills) and I have seen this once or twice. Turns out if was RFI or radio frequency interference. There are fiberglass strands in the spark plug wires to reduce RFI. The high voltage of the secondary could be causing your issue, as I have seen this happen before. On a side note, is this all the time or only in certain areas? Ive seen a problem where the trunk would pop open just driving down the road. Turns out after I drove the customers route it happened to be when you drove under the HV power lines. The RFI caused the trunk to pop.
ive seen this happen in older vehicles as well. Sometimes changing spark plug wires can fix your problem. Its not expensive nor difficult, could give you a reason to give your car a tune up.
