1998 GMC Sonoma Owner's Manual - Page 153

To unlock a secured radio, see "Unlocking the Theft-Detement Feature After a Power Loss" earlier i n this section. To help avoid hearing loss or damage: Adjust the volume control to the lowest setting. Increase volume slowly until you hear comfortably and clearly. Understanding Radio Reception The range for most AM stations is greater than for FM, especially at night. The longer range, however, can cause stations tointerfere with each other. AM can pick up noise from things like storms and power lines. Try reducing the treble to reduce this noise if you ever get it. NOTICE: Before you add any sound equipment to your vehicle like a tape player, CB radio, mobile telephone or two-way radio be sureyou can add whatyou want. If you can, it's very important to doit properly. Added sound equipment may interfere with the operation of your vehicle's engine, Delco Electronics radio or other systems, and even damage them. Your vehicle's systems may interfere with the operation of sound equipment that has been added improperly. So, before adding sound equipment, check with your dealer and sure to check Federal rules be covering mobile radio and telephone units. -- -- FM Stereo FM stereo will give you the best sound, but FM signals will reach only about 10 to 40 miles ( 16 to 65 km). Tall buildings or hills can interfere with FM signals, causing the sound to come and go. Tips About Your Audio System Hearing damage from loud noise is almost undetectable until it is too late. Your hearing can adapt to higher volumes of sound. Sound that seems normal can be loud and harmful to your hearing. Tdke precautions by adjusting the volume control on your radio to a safe sound level before your hearing adapts to it, 3-23