A grand piano has over 5,000 moving parts that need periodic adjustment, Durben says. Other pianos also must be kept in good operating order. Our social hall doesn't have a sound system. Portable systems are ideal for noisy environments such as social halls, where voices and music must be heard over ambient noise, says Merle Davis of Amplivox Sound Systems. These systems can also be used outdoors for special worship services, picnics, ice cream socials, games, and sporting events.
Children listen better to amplified sound and like to use a microphone.
As voice reinforcement for people with hoarse or weak voices. In rooms where the lectern isn't close to the audience. To back up an installed sound system in case the equipment or power source fails. For traveling ministers, lecturers, and missionaries. These units are very transportable and can operate on batteries.