For sale by Buddika 8 Nov 8:02 amBandarawela, Badulla
The NS-451 targeted the younger crowd who had never been a major demographic for conventional Yamaha speakers, an introductory-class 20cm two-way bass reflex system that produced energetic sound with attractive bass at a reasonable price. Its main feature, the Strong Woofer white woofer unit, was an important key to achieving high cost-performance. To put it simply, the sheet process involved shaping a round paperboard sheet cut out into a cone instead of the conventional process of molding paper directly into a 3D cone shape. The catalogs of the time extolled the merits of the process, saying, "fewer irregularities in thickness and density" and "extremely strong despite being lightweight," but naturally, paper is supposed to be uniform and homogeneous, and it goes without saying that this would be the result of cutting such material into a round shape.
Producing a stable supply of relatively large diameter, high efficiency yet low cost paper cone speakers while still maintaining sound tuning flexibility was a game changing, outside the box idea. With its low price of 26,500 yen making a full component system possible for 100,00 yen, the NS-451 became Yamaha’s unique gateway for young fans to get the most out of their music, and the concept of the white woofer produced by the sheet process was incorporated into Yamaha’s worldwide best-selling NS-10M and many other of its HiFi and theater speakers. The problem with sheet process speakers was that the seam where the cone element was attached was visible, but thanks to the pure white color it wasn’t noticeable and didn’t look strange or questionable. The dazzling white diaphragm of the sheet process speaker was probably due as much to this as to the desire to take advantage of the basic color of the paper and to make products that looked distinctive.
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