Handbook for Sound Engineers

72 Chapter 4 The low-frequency resonance effect is due to the mechanical resonance of the barrier. For heavier barriers, the res ...

Acoustical Noise Control 73 measured TL curve shown in Fig. 4-10, the STC overlay is first aligned to 500 Hz and adjusted vertic ...

74 Chapter 4 4.3 Isolation Systems Isolation systems must be dealt with holistically. One must consider walls, ceilings, floors, ...

Acoustical Noise Control 75 Table 4-7. Sound Transmission Class of Some Common Building Partitions* 9 ...

76 Chapter 4 general STC range of the gypsum wallboard walls 1 to 8, inclusive. The three papers by Green and Sherry report meas ...

Acoustical Noise Control 77 Steel stud partitions usually have an STC from two to ten points higher than the equivalent wood st ...

78 Chapter 4 of the engineering and calculations that have been discussed so far can be rendered meaningless if suffi- cient car ...

Acoustical Noise Control 79 Another means of decoupling the floor above from the sound room ceiling involves suspending the enti ...

80 Chapter 4 raises it only to STC-59. There are many recording studios and other sound-sensitive rooms that require floors grea ...

Acoustical Noise Control 81 Another approach by Mason Industries is to build a grid supported on neoprene mounts or, if greater ...

82 Chapter 4 one-half turn at a time. This is continued until an air space of at least 1 inch is achieved. Fig. 4-28 shows an al ...

Acoustical Noise Control 83 The design of rooms to achieve maximum isolation from airborne and structure-borne sounds is a highl ...

84 Chapter 4 4.3.10 Windows Occasionally sound rooms require windows. The obser- vation window between control room and studio i ...

Acoustical Noise Control 85 each graph. Although the heavy ¾ inch plate attains a TL of 40 dB or more above 2 kHz. It is inappro ...

86 Chapter 4 the plates with 6 inch separation is included in Fig. 4-37. The superior performance of laminated glass comes with ...

Acoustical Noise Control 87 4.3.11 Transmission Loss of a Compound Barrier We are using the term compound to refer to those part ...

88 Chapter 4 Figure 4-39. Noise-Lock™ window by IAC is rated at STC 53. Courtesy IAC. Figure 4-40. Head and sill requirements fo ...

Acoustical Noise Control 89 50 dB wall TL gives the overall TL with a window of 45 dB. (Calculated from Eq. 4-4 gives 45.7 dB.) ...

90 Chapter 4 use window units that get shut off when quiet is needed! If this solution is not acceptable, and central distribute ...

Acoustical Noise Control 91 4.4.4 Attenuation of Noise in Ducts Metal ducts with no linings attenuate fan noise to a certain ext ...