Technics SB-4500
¥ 26,800 (1 unit, around 1977)
Commentary
This is a speaker system that uses a linear phase method to align the phase characteristics between units.
It is equipped with a network that measures the phase frequency characteristics of only the unit with a delay device using a B. B. D element, and based on this, realizes flattening of the phase frequency characteristics of the entire system.
The sound center of each unit is basically the same straight line as seen immediately. It is a unique shape with a stepped mounting surface.
The vertical alignment of arrangement provides excellent horizontal directional characteristics, and the arrangement is as close as possible to improve vertical directional characteristics. The woofer is positioned higher to prevent adverse effects due to reflection from the floor.
Voice coil bobbin made of hard aluminum foil with excellent heat resistance is used.
In addition, CCAW (copper coated aluminum wire), which is lightweight and heat-resistant, is used for the coil of the tweeter.
Model Rating
| Method | 2-way, 2-speaker, linear phase bass reflex system ・ Floor type |
| Units Used | For low band : 25 cm cone type For high pass : 6 cm cone type |
| Crossover frequency | 2000Hz |
| Impedance | 6 Ω |
| Output sound pressure level | 92.5dB/W/m |
| Instantaneous maximum input | 75W |
| External dimensions | Width 350x Height 631x Depth 325 mm (w / Net) |
| Weight | 14.5 kg (With Net) |