By John Eargle
The moment variation of Loudspeaker Handbook follows an analogous common outlines because the hugely profitable first variation and has been augmented and up to date in lots of parts of expertise. so much impressive are the advancements in large-scale, programmable line arrays, disbursed mode loudspeakers, and ultrasonic-based audio transduction. also, the middle chapters on low frequency platforms, process recommendations, and horn structures were multiplied to incorporate either extra analytical fabric and a richer array of examples.
Much of the luck of the 1st variation has been because of its accessibility either to loudspeaker engineers and to put technicians operating within the box - some degree of view the writer keeps within the current paintings. an entire knowing of the underlying expertise calls for a pretty rigorous engineering history in the course of the moment yr learn. whilst, the beneficiant use of graphs, with their intuitive thrust, can be important to all readers.
Loudspeaker instruction manual, moment Edition remains to be acceptable to be used in classes on the undergraduate senior point, for graduate scholars, and for execs in audio and acoustical engineering.
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Additional info for Loudspeaker Handbook
We will use this figure as a guide in discussing the design and construction of the device. 1 The Frame The frame, often referred to as the "basket," is the ribbed conical structure that holds the driver together. Professional drivers use frames made of die-cast aluminum, while many lower-cost frames are made of stamped metal. Injection molded plastic is also used. The advantages of the die-cast structure are dimensional accuracy and relative freedom from warping when installed in an enclosure.
The need for internal damping in the cone is illustrated in Figure 2-10. At sufficiently high frequencies, the cone does not act as a single unit; rather, it acts as a mechanical transmission line with distributed mass, resistance, and compliance, providing a medium for mechanical waves to travel outward as shown. If these waves (shown highly exaggerated) reach the edge of the cone with little attenuation, they will reflect back to the cone apex, creating a pattern of peaks and dips in response.
The on-axis HF response of the deep cone may be compromised to some extent due to the fact that rear portion of the cone (the apex) is displaced from the edge of the cone by an amount that will cause a cancellation in response on-axis when the front-to-back distance is equal to a half-wavelength. A shallower cone raises the frequency at which this cancellation will take place. The so-called curvilinear cone profile shown in Figure 2-6c is often used in lightweight moving systems where efficiency and extended output at high frequencies are the chief considerations.