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First produced in 1982, the Yamaha NS-2000 is an improved version of the older NS-1000 speaker that was first made in the early to mid-1970s. Like the NS-1000, it is a 3-way acoustic suspension speaker system with a beryllium-dome midrange and tweeter. However, the woofer of the NS-2000 was entirely new, made of pure carbon fiber instead of paper. The cabinet is also improved and is larger and heavier than that of the NS-1000. The NS-2000 was Yamaha's top-of-the-line, flagship speaker product when it debuted. A few years later, the NSX-10000 was produced in limited numbers and is very similar to the NS-2000. The NS-2000 was later replaced by the smaller NS-1000x, which has a smaller woofer and similar but different-model beryllium-dome midrange drivers and tweeters. A limited issue walnut-veneered version of the NS-1000x, called the NS-1000xw, looks more similar to the NS-2000 than the standard black NS-1000x does. Also of note in Yamaha's line of beryllium-dome speakers is the later and extremely rare GF-1. ==Woofer== The woofer is made from pure, long carbon fibers that were fabricated into sheets. Eight of the sheets are bonded together to make the cone. The dust cap in the center is also a carbon fiber sheet formed into a dome. The woofer magnet is 11,350 Gauss and 220,000 Maxwell. The frame is diecast aluminum. The original rolled edging on the woofer was made of polyurethane and designed for optimal sonic performance. However, it was often fragile and deteriorated on NS-2000 speakers. Fortunately, replacement of the edge can be done by speaker repair shops and the woofer can then continue working well. The frequency response of the woofer is rated down to 28 Hz, making the NS-2000 a full-range speaker that may not need a separate subwoofer for low frequencies. The crossover starts at 500 Hz. The specifications read that the woofer is 33cm (13") in diameter. It is 13 inches when measured between the outer edges of the diecast aluminum frame. The inner diameter of the frame, including the cone and foam edge surround, measure about 12 inches. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NS-2000」の詳細全文を読む スポンサード リンク
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