1997 Chevrolet Astro Owner's Manual - Page 174

To unlock a secured radio, see "Unlocking the Theft-Deterrent Feature After a Power Loss" earlier in 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 FM Stereo FM stereo will give you the best sound. But FM signals will reach only about 10 to40 miles (16 to 65 km). Tall buildings or hills can interfere with FM signals, causing the sound to come and go. . 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 what you want.If'you can, it's very important to do it properly. Added sound equipment may interfere with the operation your vehicle's of engine, Delcoradio or other systems, and even damage them. Your vehicle's systems may interfere with the operation sound equipment of that has been added improperly. So, before adding sound equipment, check with your dealer and be sure to checkFederal rules covering mobileradio and telephone units. -- AM The range for most AM stations is greater than for FM, especially at night. The longerrange, however, can cause stations to interfere 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. -- Tips About Your Audio System Hearing damage from loud noise is almostundetectable until it is too late.Your hearing canadapt to higher volumes of sound. Sound that seems normal can be loud and harmful to your hearing. Take precautions by adjusting the volume control on your radio toa safe sound level before your hearing adapts to it. 3-28