CEDIA ESPA EST Practice Test

Answer - D - Speaker volume decreases by 6 dB if the distance from the speaker to the sound source is doubled.

Key Takeaway: Sound gets weaker as the distance from the source is increased. The Inverse square law specifies that when the distance from the source is doubled, the sound pressure weakens by 6 dB. So at a 6-ft. distance a speaker produces 89 dB. If the distance is increased to 12 feet, the speaker now produces 83 dB.