CORAL FLAT-10
¥ 7,400 (1 unit, around 1973)
Commentary
A 25 cm double-cone type full range unit developed based on the technical results obtained with FLAT-5 and FLAT-6.
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 | 25 cm double cone, full range speaker |
| Nominal size | 25cm(10") |
| Impedance | 8 Ω |
| Lowest resonance frequency (fo) | 35Hz |
| Program source input | 40W |
| Output sound pressure level | 102dB |
| Playback frequency band | Fo ~ 20 kHz |
| Air gap magnetic flux density | 12,000gauss |
| Qo | 0.5(35Hz) |
| Equivalent mass | 17.5g |
| External dimensions | Diameter 302x Depth 105 mm |
| Baffle Opening Dimensions | 226 φ mm (Prominent 265 φ mm) |
| Mounting Hole Position Dimension | 240 φ mm (Prominent 281 φ mm) |
| Magnet weight | 750g |
| Gross weight | 2.8kg |
.jpg)