Get Loudspeaker Handbook PDF

By John Eargle

ISBN-10: 1441953906

ISBN-13: 9781441953902

ISBN-10: 147575678X

ISBN-13: 9781475756784

The moment version of Loudspeaker Handbook follows a similar normal outlines because the hugely winning first version and has been augmented and up to date in lots of parts of expertise. so much remarkable are the advancements in large-scale, programmable line arrays, allotted mode loudspeakers, and ultrasonic-based audio transduction. also, the middle chapters on low frequency structures, approach recommendations, and horn platforms were accelerated to incorporate either extra analytical fabric and a richer array of examples.

Much of the good fortune of the 1st variation has been as a result of its accessibility either to loudspeaker engineers and to put technicians operating within the box - some extent of view the writer keeps within the current paintings. a whole figuring out of the underlying know-how calls for a reasonably rigorous engineering historical past throughout the moment yr examine. even as, the beneficiant use of graphs, with their intuitive thrust, might be worthy to all readers.

Loudspeaker guide, moment Edition remains to be applicable 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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Example text

The JBL model 2226H driver, whose response is shown in Figure 2-26, is rated at 600 watts with a shaped pink noise signal covering the frequency decade from 50 to 500 Hz. The noise signal is limited to a 6 dB crest factor. Normal operation of the driver is in the range perhaps 10 dB lower than full Cones and domes 45 rating (one-tenth rated power), so it is customary for the manufacturer to publish the 60-watt distortion data for such a driver. Generally, second and third harmonic components are dominant in the driver's distortion signature.

The distortion generated by a 25 mm ( 1 in) titanium dome device is shown in Figure 2-27. Again, the curves are run at one-tenth the nominal power rating of the device. Below about 5 kHz the distortion is due largely to suspension nonlinearity. Above 6 kHz the distortion is largely a result of breakup modes in the diaphragm. J ~r.. , ·, .. ~ ~ ·... ~ t: 80 r1k :\l 2k 3k I ~"' "i'l f t·~· '· ' ( ~ 10k 20k Frequency (Hz) Figure 2-27. On-axis response of a 25-mm (1 in) titanium dome HF driver at one-tenth rated power.

Olson et al. ( 1954) present the data shown in Figure 2-14. Here, the nature ofthe suspension motions are clearly indicated, and the addition of a rubber damping ring to the suspension smooths the response dip, as shown. A~--7 B c ~-7 Figure 2-13. Various surrounds in section view. Half-roll surround (A); double half-roll surround (B); "accordion" surround (C). / /"\ A '-" 1/ ' 400 too aoo 1000 3000 2000 'AEOUENCY IN CYCLES 1-ER SECOND D c lltU81ER 20 ,. /" 10 0 400 100 aoo 1000 2000 3000 FREQUENCY IN CYCLES PER SECOND Figure 2-14.

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Loudspeaker Handbook by John Eargle


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