ONKYO D-77X
¥ 59,800 (1 unit, released in 1986)
Commentary
Based on the high performance of the original model, this is a speaker system that completely removes unnecessary vibration from all parts of the system and refines the music waveform.
A 31 cm cone type unit is used for the low range.
The completion is enhanced by the installation of the acoustic stabilizer of the heavyweight weight which suppresses the vibration of the unit and the adoption of the engineering elastomer edge with excellent linearity.
Pure cross carbon is used for the diaphragm, and magnet of φ 140x φ 75x φ 17 tmm is used for the magnetic circuit.
A 12 cm cone type unit is used for the middle area.
The diaphragm is composed of two layers of fine woven carbon fibers with approximately twice the amount of carbon fiber per unit area compared to pure cross carbon of Woofer.
In addition, we applied high-frequency resonance cancellation technology to partially change the half apex angle of the cone to two types of 25 ° and 55 ° to suppress peaks and improve the transient response.
In addition, it is mounted firmly in the cabinet with 8 screws to eliminate interference from unnecessary vibration.
A 2.5 cm dome type unit with a diaphragm made of plasma-nitrided titanium is used for the high frequency range.
Unlike the general coating method, there is no boundary between the nitride part and the substrate part, so it has excellent durability.
The enclosure structure has succeeded in reducing vibration through the use of an ultra-thick front baffle of 40 mm as well as the acoustic stabilizer on the woofer.
In addition to increasing the overall strength, it prevents vibration interference between each unit, improving the transparency of the low range and increasing the purity of the middle and high range at the same time.
Model Rating
| Method | 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type |
| Units Used | For low band : 31 cm cone type For Medium Range : 10 cm Cone Type For high-pass : 2.5 cm dome type |
| Playback frequency band | 28 Hz to 45000 Hz |
| Crossover frequency | 300 Hz, 2500 Hz |
| Max Input | 200W |
| Impedance | 6 Ω |
| Output sound pressure | 91dB/W/m |
| Cabinet internal volume | 57L |
| External dimensions | Width 380x Height 670x Depth 363 mm |
| Weight | 34kg |