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JCC Tri-Valley Preschool Outdoor Play Area Noise <br /> 30 January 2017 Page 8 <br /> With regard to increases in noise level, knowledge of the following relationships will be helpful in <br /> understanding the quantitative sections of this report: <br /> Except in carefully controlled laboratory experiments,a change of only 1 dB in sound level cannot be <br /> perceived. Outside of the laboratory,a 3 dB change is considered a just-noticeable difference.A <br /> change in level of at least 5 dB is required before any noticeable change in community response would <br /> be expected.A 10 dB change is subjectively heard as approximately a doubling in loudness,and would <br /> almost certainly cause an adverse community response. <br /> Acoustics <br /> Audiovisual <br /> Telecommunications <br /> Security <br /> 130 Suffer Strout <br /> F our 5 <br /> Scri Fronci,co CA <br /> 04104 <br /> T 415 3970442 <br /> F 315 3970454 <br /> V.w'w crnro;:e,cur <br /> Salter <br /> ,..'r- <br /> 4'1 <br />