EFC Media Center Training Introduction What is Sound

Introduction • What is Sound ? • Properties of Sound – Speed 340 m/s

Introduction Range (d. B Sound Pressure Level) 0 - 30 Very Quiet This is

Introduction 71 - 90 Loud This is the point where a sound becomes annoying

Introduction • How do we perceive sound – – – 20 ~ 20 KHz

Introduction • Purpose of Audio System in Church – Amplify voices so that it

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EFC Media Center Training

Introduction • What is Sound ? • Properties of Sound – Speed 340 m/s – Frequency / Pitch – Loudness / SPL

Introduction Range (d. B Sound Pressure Level) 0 - 30 Very Quiet This is the threshold of human hearing, up to the sound of a quiet whisper. 31 - 50 Quiet This is an average quiet house, with maybe the sound of a fridge running or someone moving around. 51 - 70 Normal Regular daily sounds like people talking.

Introduction 71 - 90 Loud This is the point where a sound becomes annoying or distracting. Vacuums or a noisy car on a busy street are at these levels. 91 - 110 Very Loud Most people will try to avoid being in areas this loud. Prolonged exposure can cause permanent ear damage. Temporary effects, like "stereo hiss", may happen. 111 + Painful!!! Even limited exposure to levels this high will cause permanent hearing loss.

Introduction • How do we perceive sound – – – 20 ~ 20 KHz range Perceived loudness at different frequency Perceived spectral response at different average loudness level

Introduction • Purpose of Audio System in Church – Amplify voices so that it will be noise free, intelligent, with sufficient volume even for our elderly. • Purpose of Sound Engineer – To operate and maintain audio equipments so that our congregation is free to worship without distractions.