YAMAHA NS-550 [1973]
The basic research to the base of the NS speaker, developed speaker system aimed at music rich and resolution clear sound.
JA-3505B of NS type Woofer as low-pass with a unique patented structure has been adopted.
It has adopted a large-diameter aluminum ribbon line edgewise-wound voice coil of 52φ.
In the high region it is equipped with a short horn type tweeter JA-0505.
Vibration plate duralumin foil with a thickness of 30μ is adopted to, does not use the bobbin in order to reduce the vibration system, directly connected to the diaphragm and the voice coil, it has become a edgewise wound aluminum ribbon line.
Expanded urethane braking element has earned a high-pass characteristic which is excellent is used between the further diaphragm and the center pole.
Network part is designed to repeatedly listen and static characteristics measurement.
Use the air-core coil in order to avoid the distortion by the network, along with the lower the DC resistance adopted a formal line of 0.8φ, we have to reduce the characteristic change to prevent power loss.
In addition, the capacitor uses a MP capacitor.
Enclosure has a closed system, has become a rare tall Boy type as that time so as not to take the floor space.
In addition, snow white polyester paint on the top plate, has adopted a design which has been subjected to American walnut oil finish to the side plate.
Rating models
method 2-way 2 speakers, a sealing scheme, and a Tallboy type
Use unit For low-pass: NS type (JA-3505B)
High-frequency: 5cm short horn type (JA-0505)
Play frequency band 60Hz ~ 18000Hz
The lowest resonance frequency (fo) 65Hz
Crossover frequency 5kHz, 12dB / oct
Impedance 8Ω
Output sound pressure level 91dB / W / m (new JIS)
Maximum permissible input 36W
External dimensions Width 402 × height 1021 × depth 303mm
weight 32.5kg
