CORAL FLAT-5
¥ 2,650 (1 unit, around 1973)
Commentary
Flat Series 12 cm cone type full range unit.
The diaphragm of the flat series is made of pulp, the main raw material, mixed with chemical fiber, and is specially shaped by the latest molding machine.
In addition, a hard lightweight alloy dome is adopted in the center of the diaphragm to improve the directional characteristics in the ultra-high frequency range.
The long voice coil using copper clad aluminum wire, which was also used in the beta series, is adopted to reduce amplitude distortion and improve intermodulation distortion.
A ceramic magnet with a large coercive force is used for the magnetic circuit to improve efficiency.
In conventional speaker units, when mounted on a baffle plate, cavity resonance occurs due to the thickness of the baffle hole, causing a dip or peak in the mid-range region. To solve this problem, the Flat Series employs a flat-mounting method using a prominent frame.
.jpg)
Model Rating
| Type | 12 cm full range speaker |
| Nominal size | 12cm(5") |
| Impedance | 8 Ω |
| Lowest resonance frequency (fo) | 70Hz |
| Program source input | 10W |
| Output sound pressure level | 97dB |
| Playback frequency band | Fo ~ 18 kHz |
| Air gap magnetic flux density | 11,000gauss |
| Qo | 0.55(70Hz) |
| Equivalent mass | 3.1g |
| External dimensions | Diameter 161x Depth 55 mm |
| Baffle Opening Dimensions | 108 φ mm (Prominent 139 φ mm) |
| Mounting Hole Position Dimension | 119 mm (Prominent 148 φ mm) |
| Magnet weight | 250g |
| Gross weight | 0.76kg |
.jpg)