Handbook for Sound Engineers

632 Chapter 17 usually on axis. This is the equivalent of assuming that the on-axis response will be equalized flat, which is no ...

Loudspeakers 633 17.10.1 Acoustics of Radiators An understanding of direct sound radiation from a piston in space, a baffle, or ...

634 Chapter 17 response over this range of frequencies. This mecha- nism is the mechanical impedance due to the moving mass of t ...

Loudspeakers 635 A second difference between real loudspeakers and our theoretical piston is that practical diaphragms are very ...

636 Chapter 17 Note the separation of right side of the equation for pressure response into two parts. The first contains amplit ...

Loudspeakers 637 requiring less woofer excursion for a given acoustic output in the lowest portion of its usable bandwidth. In g ...

638 Chapter 17 (17-31) 17.10.3 Horns Although there are numerous mathematical treatments of horns in the texts on acoustics, the ...

Loudspeakers 639 frequencies will be integer multiples of this frequency. In order to have infinitesimally small frequency resol ...

640 Chapter 17 computer-based measurement system, processing and display of the data can be accomplished at any time after the r ...

Loudspeakers 641 this technique have several common elements. The technique involves sampling the signal at a point in the chain ...

642 Chapter 17 Allan D. Pierce, Acoustics: An Introduction to Its Physical Principles and Applications, New York: McGraw- Hill, ...

Loudspeakers 643 R. H. Small, “Vented Box Loudspeaker Systems; Part I II III and IV,” J. Audio Eng. Soc., Vol. 15, nos. 5, 6, 7, ...

This page intentionally left blank ...

645 Chapter 18 Loudspeaker Cluster Design by Ralph Heinz 18.1 Why Array?........................................................ ...

This page intentionally left blank ...

Loudspeaker Cluster Design 647 18.1 Why Array? For the purposes of this discussion we can define a loudspeaker array as a group ...

648 Chapter 18 each with two or three separate acoustic centers of its own. It’s easy to appreciate that getting all those discr ...

Loudspeaker Cluster Design 649 Fig. 18-6 shows why there will always be interfer- ence with conventional horn arrays (whether th ...

650 Chapter 18 (18-4) The square of the pressure amplitude is given by: (18-5) where, Ai(T) is Ai(T - Di For a circular arc ar ...

Loudspeaker Cluster Design 651 while matching the trapezoidal sides with the opening angle of the horn, creates a system capable ...