![]() ![]() To enable small speakers with only a single frail tweeter to handle power peaks, liquid cooling is now used in many models. Occasionally, they burned out altogether and the tweeter, after a final gasp, subsided into lasting silence. During powerful musical climaxes, the internal structures of small tweeters grew so hot that their delicate coils were deformed and scraped - rather than glided - along their path. Problems also arose at the top end of the frequency range, where the tweeters in small speakers suffered meltdown at high volume levels. Also, new materials had to be found for suspending the cone at its edge so that its elastic resistance remained constant all along the way. For if the motion does not precisely correspond to the signal at every point of the cone's travel, the result is distorted sound. New magnet structures had to be developed to permit the small cones to travel their long back-and-forth excursions without loss of linearity - that is, keeping their motion exactly proportional to the electrical signal, even at the far ends of each trip. This simple principle proved difficult to translate into practice. They substitute length of cone travel for greater cone area to generate the required amount of air movement. That is exactly what many small models now do. This means letting the cone travel a greater distance back and forth with each stroke, so that it scoops up more air along the way. But small speakers can increase their effectiveness by lengthening their throw. ![]()
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