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Permanent magnets play important role in everyday life. Decorative magnets used to hold children?s artwork, calendars and shopping lists to refrigerators or magnetic bulletin boards are highly visible on a daily basis. In manufacturing, permanent magnets are vital items for electronic appliances and also for medical products. Inside a speaker, you will find permanent magnet that translate signals into sound-carrying vibrations. The magnets convert the electrical signals through the use of coils. Then the coils transfer sound to the speaker cones through the bobbins that are wrapped around them. The cones move due to air pressure from the interaction of the vibrations and the magnets.