YAMAHA NS-2000

YAMAHA NS-2000 ¥228,000 ~3000usd (1 unit, around 1982)

System: 3 ways 3 speakers airtightness system bookshelf type
Use unit:It is low the for limits: 30cm cone type (JA-3301)For middle limits: 8.8cm dome type (JA-0802A)For high pass: 3.0cm dome type (JA-0526A)
Playback frequency zone
28Hz - 20kHz
Crossover frequency:500Hz and 6kHz (-12dB/oct)
Lowest resonance frequency:33Hz
Impedance:6 Ω
Output overpressure value:90dB/W/m
Allowance input:125W
Music allowance input:250W
Level control:Mediant: +3dB - - XXINFTreble: +2dB - - XXINF
External size:Width 440× height 752× depth 404mm
Weight:47kg

Explanation

How the finishing maturing music in the background, the cohesion of speaker technology as a playback art, the speaker system which was developed in goal whether you can produce impressed sound.Low JA-3301 which is the 33cm cone type woofer is loaded in the limits.As Yamaha new developing the pure carbon fiber cone which for the first time does not use the paper, you have adopted for the diaphragm. This diaphragm, the woofer 8 in order to become radial pattern, arranges the carbon fiber unidirectional arrangement seat of the form which is divided equally in sector, uses the special resin for the matrix and adopts the method of forming, shape of the diaphragm as pulling compressed strength of fiber direction is utilized as a straight conical type, has raised the rigidity of the whole woofer.

In addition, you bend to diaphragm outer circle and provide the rib on reverse side of the section and the cone, designate the rigidity of circumferential direction as firm ones.Magnetic flux distribution is calculated in the magnetic circuit making use of finite element method, in order for the strain component of the driving force which works in voice coil extremely to become with little the new design magnetic circuit which is designed is adopted. The magnet 180 φ -100 φ -20t has adopted the ferrite magnet, flux density 11,350gauss, the numerical value, entire magnetic flux 220,000maxwell has been shown. In addition the oxygen free copper wire is used to voice coil, the edge wise volume voice coil 88 φ is adopted.Furthermore, the roll edge of the urethane foam is adopted to the edge, those to which also the damper which supports vibrating system adds sufficient examination for the material and the impregnation material are adopted.In addition, the special aluminum alloy is adopted to the frame.JA-0802A which is 8.8cm hard dome type スコーカー is loaded in the middle limits.

In the diaphragm, it formed with the individual system which applies the electron beam vacuum vapor deposition method which is used for LSI manufacturing technology, pure beryllium is adopted. With NS-2000 from former beryllium furthermore it has succeeded in the production of the diaphragm finely with those of the particle. This diaphragm directional characteristics has improved by the fact that it makes small form of radius of curvature, the valley by the interference which to quality on the axis outside the zone which occurs with this happens, is held down by the fact that the D fuser is adopted.In addition, we adopt those which edge wise volume do the oxygen free copper ribbon line to voice coil, coating do the visco-elastic polymers and the thermosetting metaplasia resin doubly in the edge and we adopt the tangential edge of the special fiber which raises the linearity.156 φ -80 φ -25tmm we adopt the ferrite magnet to the magnetic circuit, flux density 18,400gauss, obtain entire magnetic flux 150,000maxwell.To 3cm hard dome type JA-0526A which is the eater is loaded in high pass.We adopt pure beryllium to the diaphragm same as the middle limits, we assure the playback to outside audible zone by the fact that it makes small size lightweight of the aperture 23mm and weight 0.028g.

Furthermore, the acoustic diffuser which improves the frequency characteristic and directivity of high pass is loaded on the diaphragm front.The bobbin with the special kraft paper which is superior in durability, it raises rigidity with the high purity copper clad aluminum ribbon line of light weight as an edge wise volume, it supports in the tangential edge of the special fiber which the visco-elastic polymers and the thermosetting metaplasia resin double coating is done. In addition, the diaphragm converting the center pole of the space from now on tapered, fills up the acoustic material in the opening, makes the adverse effect to the sound with resonance minimum.100 φ -50 φ -22tmm adopting the ferrite magnet to the magnetic circuit, flux density 18,800gauss, you obtain entire magnetic flux 34,000maxwell.It does the constitution, large-sized ferrite core and the inductor and all MP condenser which uses the oxygen free copper wire in the network section and sub- business has done.

In addition, also internal wiring has used all oxygen free copper wires, wire rod itself one one welding processing, will do those which stop calling, it is.To スコーカー level control of continual variable type is loaded onto the eater.As for アッテネーター which is adopted allowance input is adopted to be sufficiently large those whose sound quality deterioration is little.With NS-2000, arrangement of speaker unit in the vertical one line we have arranged in center position of the baffle aspect, directivity response pattern inside the horizontal plane is made left and right equal. Furthermore, by the fact that it makes the round baffle which finishes the left and right edge of the baffle with the curved surface, diffraction phenomenon of the sound wave is held down.ネクロージャー is designed to be complete airtightness structure of the content volume 80L, we adopt the pure material of Buna around the board and the round baffle which the 25mm thick high density party come extensively we raise strength reinforcement 棧, with the large quantity use of the corner wood. We use modal analysis to the design of this enclosure, raise the strength balance of each part.The finish has become the opening pore finish of the American walnut.