Aurex SS-520
¥ 47,800 (1 unit, around 1976)
Commentary
A speaker system with a symmetrical design.
A 25 cm cone type woofer is installed in the low range.
The diaphragm uses a 8.0g lightweight cone with increased rigidity by special press and resin treatment, and excellent transient is obtained by driving with a large ferrite magnet of 120 mm diameter.
4 mm thick diecast is used for the frame part.
The mid-range is equipped with a 10 cm cone type squaker.
This unit has a resin coating on the cone for rigidity and internal loss, and a large back cavity with a capacity of 1.2 liters on the back to prevent interference with the woofer unit.
The cap is filled with urethane to prevent unwanted resonance.
A 2.5 cm dome type tweeter is installed in the high range.
Carbon fiber dome with excellent transient is used for the diaphragm, and internal loss is increased by binding with plastic, and there is no sharp peak.
In addition, a viscoelastic material is used to float it from the baffle, so that sound escape is improved.
It is equipped with continuously variable level control for the middle and high ranges.
A ferrite core coil with low DC resistance is used for the woofer high-cut and squaker low-cut in the network section, and an air core coil with low distortion is used for the squaker high-cut and tweeter low-cut.
The enclosure has a symmetrical symmetrical layout and is made of high-density particle board.
The bass reflex port uses a multi-duct system to expand the frequency range of the bass reflex effect. In addition, it has a new design that controls air resistance by means of a funnel-shaped duct with a continuously variable diameter. By using the relationship between air resistance and particle velocity, appropriate losses are given to each of the multi-ducts to the boomy effect.
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Model Rating
| Method | 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type |
| Speaker used | For low band : 25 cm cone type For Medium Range : 10 cm Cone Type For high-pass : 2.5 cm dome type |
| Frequency characteristic | 30 Hz to 20 kHz (SPL-20dB) |
| Max Input | 60W |
| Rated input | 30W |
| Impedance | 6 Ω |
| Output sound pressure level | 91dB/W/m (input voltage 2.45 V) |
| Crossover frequency | 800 Hz, 5 kHz |
| Level control | Continuously variable for high band and middle band |
| Internal volume | Approximately 50 liters 1.2 Liter (midrange Part) |
| External dimensions | Width 340x Height 700x Depth 332 mm |
| Weight | 21.0kg |