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By paying careful attention to the sound system design, we can improve intelligibility quite significantly. The important factors include:

Install accurate speakers which provide controlled dispersion angles and even coverage.
The speakers must be selected and installed to provide accurate sound and project it evenly throughout the seating area of the room, and not into the ceiling [...]

Radio frequency interference (RFI) can bleed into sound systems from nearby radio stations, or C.B. radio transmitters. Electro-magnetic frequency (EMF) interference can also come from other electrical devices such as electrical transformers, fluorescent lights, computers, electric motors, or switches.
High impedance microphones and equipment are much more sensitive to these types of interference. In some cases, [...]