How the Car Audio System Works

AM and FM radio signals are broadcast from transmitting towers located around your city. They are received by your vehicle's radio antenna. The signal is then processed by the radio and sent to the speakers in your vehicle.
When a strong radio signal reaches your vehicle, the precise design of your audio system provides the best playback quality. However, in some cases, the signal reaching your vehicle may not be strong and clear.
This may be caused by many factors, such as distance from the radio station, proximity to other strong radio stations, or buildings, bridges, or other large obstacles in the area.

AM broadcasts can be received over longer distances than FM broadcasts. This is because AM radio waves are transmitted at low frequencies. These long, low-frequency radio waves can follow the curvature of the earth rather than travel straight into the atmosphere. In addition, they bend around obstacles so they can provide better signal coverage.

FM broadcasts are transmitted at high frequencies and do not follow the surface of the earth. Therefore, FM broadcasts usually begin to fade over short distances from the station. In addition, FM signals are easily affected by buildings, mountains, or other obstacles. They can cause certain listening conditions that may make you believe there is a problem with your radio. The following conditions are normal and do not indicate a radio malfunction:

- Fading - As your vehicle moves away from the radio station, the signal will weaken and the sound will begin to fade. When this happens, we suggest you select another, stronger station.
- Flutter/Static - Weak FM signals or large obstacles between the transmitter and your radio may interfere with the signal, causing static or fluttering sounds. Reducing the high frequency level may reduce this effect until the interference disappears.

- Station switching - As the FM signal weakens, another, stronger signal on the same frequency may begin to play. This is because your radio is designed to capture the clearest signal. If this happens, select another station with a stronger signal.
- Multipath cancellation - Radio signals received from multiple directions may cause distortion or fluttering. This may be caused by a direct and reflected signal from the same station, or by signals from two stations with close frequencies. In this case, select another station until the condition passes.
Using a Cellular Phone or Two-Way Radio
When a cellular phone is used inside the vehicle, noise may come from the audio system. This does not mean that there is something wrong with the audio equipment. If this happens, try using the cellular phone as far away from the audio equipment as possible.
When using a communication system, such as a cellular phone or two-way radio, inside the vehicle, a separate external antenna must be installed. When a cellular phone or radio is used with only an internal antenna, it may interfere with the vehicle's electrical system and adversely affect the safe operation of the vehicle.
WARNING
Do not use a mobile phone while driving. Stop in a safe place to use a cellular phone.
WARNING - Driver Distraction
Driving while distracted may result in loss of vehicle control, which may lead to an accident, serious injury, or death. The primary driver is responsible for the safe and legal operation of the vehicle. Portable devices, other equipment, or vehicle systems that take the driver's eyes, attention, and focus away from the safe operation of the vehicle, or that are not permitted by law, should never be used while the vehicle is being operated.
WARNING! Audio System
Do not disassemble, assemble, or modify this audio system. Such actions may result in fire or electric shock.
WARNING - Antenna
Do not touch the antenna during thunder or lightning, as such actions may result in lightning strike or induced electric shock.
Test yourself
A quick Kia Forte BD quiz: every answer comes with an explanation and a link to the manual page.