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Originally Posted by RandallNeighbour
This makes no common sense to me. The noise eliminator is put between the power line coming from the car and the head unit. It simply eliminates certain frequencies to pass through the power leads. It should have no bearing on what the head unit produces and sends to the speakers, but it does have a bearing on what the head unit does not transfer to the speakers.
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Hi,
Not exactly true. This type of noise can be signals which the power leads pick up and transmit (along with the power) to the Head Unit's circuitry. This can then be amplified. Noise filters block specific frequencies or a range, but often these stray signals fall outside the range of the filter and some still passes through.
With alternators, AC is produced and converted to DC current. But, some stray AC can still be present and cause the noise.
Another issue, as I stated, over weeks, the human ear can adjust and pick up this noise once again. In any event, the Lister will subconsciously be listening for it.
I say it's a Band-Aid in that it merely covers up the problem, when the cleanest sound will be had through eliminating it. As I said, I suspect theere's a Diode or two not up to snuff in the Alternator and this is where the noise emanates from. But, it also means that the Alternator is not 100% and may need attention anyway in short order which is why I recommend having it checked and killing both birds at once...
Happy Motoring!... Jim'99