I read through this thread and thought I'd offer one more source of potential noise. That source would be a partially failing alternator. Not sure how many people know that a diode on a modern alternator can fail and no light on the dash will show this - you are still partially charging. Only way to detect it* is through looking at the output on an O-scope or similar. What you would see is a partially rectified output with a much less 'smooth' line to the DC being sent to the battery and any other load devices. Among other ramification, this can create issues through fluctuating voltage for things like a display plugged into the cigarette lighter.
* Note: Well I guess if you were previously barely able to run something with a healthy alternator, and a diode failed you might notice, but in that scenario you're already probably replacing alternators on a regular basis due to load induced issues.
Ok, I have hooked up a few systems, and now my very own. I did what most people do, use cheap parts and expect it to be the best on the block. But in my case, it is! But now, after hooking up my Compt. Pioneer speakers, there is the noise... The whine that makes every man scream! Sounds good standing still! lol but what good is a Good system standing still when you use it for everyday driving?
Now, on to my set up. The amp is a no name, Jessen? It was hooked up to my 2 12" Duals, it sounded great, hit hard and all! But then I wanted to go louder, and so I split my amp to now go to the Compt speakers, and now the sound is here. I ran my cords like a good Instalation boy, Got my power cord running with the rest of my electrical cords running on the left side and my cords from the head unit on the right.
My Ground is to my frame, found a nice little unpainted bolt. My amp wires, even wrapped in 3 layers of Foil, and then with electrical tape to make sure of no interference. I just had my alt replaced, due to the fact that it is way passed 100000 miles. YAY! But still, I cant find the source, the only thing I can think of is if the amp maybe on the side of going out? Or maybe since its only 400 watts, and I have it maxng out? the speakers are set up for 4ohm and so are the set of Duals, and Im pretty sure the amp is too, but I cant really find ANYTHING on that amp lol. Any idea's are very much thanked!
Hopefully its pretty simple, or cheap! I do plan by next year to Move up to, two 15" 1000watts each and then upgrade the amp, and get some front speakers. But before I do that, I need to fix this! :)
Sorry to bug I have this buzzing noise. I have two options:
http://www.amazon.com/Peripheral-PLD...ref=de_a_smtd# Adjustable gain levels Low 20 milliampere consumption Configurable output ground isolation
or a ground loop isolator
Note I am using a home stereo not a car.
I'm still struggling to solve this problem. I really need help.
My problem is really simple. WITH THE ENGINE OFF - I have a mini 12v amp connected directly to a NEW connection from the car battery. When I connect my phones' earphone 3.5mm plug to the amp, the sound is perfect - crystal clear. However, the minute I connect my car charger to my phone, I get the following sound. I have tried a ground Loop Isolator between my phone and the mini amp and it makes absolutely no difference.