The higher pitched and more irritating ‘buzz’ is typically found emanating from the loudspeakers and is usually caused by a ground loop.
The low non-irritating drone hum is usually internal to the equipment and is mechanical in nature. Video hum is usually seen as diagonal bars across the TV or screen of a projector. The ‘hum noise’ usually comes in two flavors, a low non-irritating drone (50 or 60 Hz) or a slightly higher pitched buzz or raspy/irritating ‘angry insect’ sound (100 or 120 Hz). Sometimes hums and buzzes are quite obvious, sometimes not. If your system has a bit of hum, is it the transformer or a ground loop? How do you determine the source of hum and what can you do about it? There are usually always a few hum related problems. Very few audio or video systems are dead quiet. There is a shorter 3-step version available here. Also, it only happens when it is plugged into the iPod.This is the extended version. This is recorded with the engine off, but I started the car and tried again and it sounded identical. Here is a sample of the sound For some reason the music on the recording was louder than it was IRL. It happens even with the engine off (running off the car battery) Radio: Sony GT33W Car: 99 Pontiac BonnevilleĮdit: The IPod/Phone isnt being charged by the car and the pitch does not change with speed. Ive tried multiple 3.5 mm audio cables and checked the connections between the wiring harness and the radio with a multimeter. (I've noticed this happens when its really cold out, but that might just be my imagination) But every once the noise remains now matter how I mess with the volume. Now, usually this can be fixed by turning up the volume on my iPod or Phone. This doesnt happen with the CD player or radio no matter how high I turn up the volume. On the aux input of my car stereo, if the input device is of a low volume and the car stereo is on high, I get a high pitched noise coming through the speakers.
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