Car Audio Noise Trouble Shooting
You've installed a new receiver or amplifier in your car, and now you have a noise problem. Noise in your audio system commonly comes in these three forms:
- Radio static
- Amplifier whine
- Buzzing speakers
What can you do? The trick is to determine what the source of the noise is. Noise can be introduced into your system from a number of sources.
1. Noise and your new receiver
- Is your receiver securely grounded?
Improper ground is one of the biggest causes for introducing noise into your audio system. Is the ground wire located near a noise source (like a heater, air conditioner, or computer)? Is the ground wire actually connected to the vehicle's ground? Since the antenna lead can act as a ground (thereby enabling a new receiver to operate without its ground wire properly connected), the antenna lead is frequently the source of noise problems.
- Radio static can be caused by antenna noise
Check to see if you're getting noise on all sources — CD, auxiliary/USB, AM, and FM. If the noise is present only on the radio, then it's most likely coming through your antenna lead. Unplug the antenna. If the noise goes away, try an antenna noise suppressor.
- Radiated noise
If the noise isn’t coming in through the antenna, try pulling the receiver from the dash while a CD is playing. If the noise goes away, it's being radiated into your system due to the receiver's proximity to a noise producer (like a heater motor or car computer).
- Engine noise and alternator whine
Noise introduced through the power and ground wires connected to your receiver is called engine noise or alternator whine. If engine noise is your culprit, you may hear a whining or clicking sound. Its pitch will usually vary with engine speed.
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