Handbook for Sound Engineers

112 Chapter 5 To calculate the effective thickness for a perforated absorber, a correction factor, G, is required. This factor i ...

Acoustical Treatment for Indoor Areas 113 fill). The air mass in the slots between the slats reacts with the springiness of the ...

114 Chapter 5 on wavelengths that large, most likely one could move a wall, improving, if not optimizing, the modal distribution ...

Acoustical Treatment for Indoor Areas 115 common RT equations will not work satisfactorily in these spaces. Absorption is often ...

116 Chapter 5 Table 5-3. Absorption Data for Common Building Materials and Acoustical Treatments (All Materials Type A Mounting ...

Acoustical Treatment for Indoor Areas 117 basic sense, diffusion can be thought of as a special form of reflection. Materials th ...

118 Chapter 5 plots of the diffuse sound field from a diffuser. The less lobing there is in a diffusion polar plot, the more dif ...

Acoustical Treatment for Indoor Areas 119 number, in this case the square of n, is divided by the second number, in this case p, ...

120 Chapter 5 particularly helpful when budget is a concern since diffu- sive treatments tend to cost twice to ten times more th ...

Acoustical Treatment for Indoor Areas 121 For more information on the design of usefully reflective surfaces for large spaces, s ...

122 Chapter 5 as an acoustical treatment is typically tested in accor- dance with the ASTM E84 standard to measure flamma- bilit ...

Acoustical Treatment for Indoor Areas 123 References Don Davis, If Bad Sound Were Fatal, Audio Would Be the Leading Cause of De ...

124 Chapter 5 V. S. Mankovsky, Acoustics of Studios and Auditoria, New York: Focal Press, 1971. Data available from RPG, Inc., ...

125 Chapter 6 Small Room Acoustics by Doug Jones 6.1 Introduction............................................................... ...

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Small Room Acoustics 127 6.1 Introduction The acoustics of small rooms is dominated by modes, shape, and reflection management. ...

128 Chapter 6 If we consider only the length of the room, we set q and r to zero, their terms drop out, and we are left with (6- ...

Small Room Acoustics 129 axial modes (for now) we see a fundamental mode at 565/12 or 47.08 Hz. If we continue the series, looki ...

130 Chapter 6 of standard building materials. Our next test room is 16 ft long by 12 ft wide with a ceiling height of 8 ft (4.88 ...

Small Room Acoustics 131 The ratio of the dimensions determine the distribution of modes. The ratio is determined by letting the ...