ONKYO D-7R
¥ 59,800 (1 unit, released in 1982)
Commentary
A speaker system that employs a delta olefin refined diaphragm.
The low range is equipped with a 32 cm cone type woofer adopted for the delta olefin refined diaphragm.
This diaphragm maintains the ideal internal loss as it is, and by controlling the added compound, the Young's modulus is increased by 4 times and the rigidity is strengthened.
Also, 140 φ mm magnet is used for the magnetic circuit.
A 12 cm cone type squaker using a delta olefin refined diaphragm is mounted in the middle range.
A 2.5 cm dome type tweeter is installed in the high range.
The diaphragm is made of magnesium alloy, which was the first to succeed in resin deposition, and high efficiency is achieved by applying an ultra-thin uniform coating of 6 μ m.
Also, a 90 φ magnet is used for the magnetic circuit.
Equipped with independent level independent level control for middle and high frequencies.
The enclosure has a symmetrical design.
Model Rating
| Method | 3-way 3-speaker air suspension system Bookshelf type |
| Units Used | For low band : 32 cm cone type For Medium Range : 12 cm cone type For high-pass : 2.5 cm dome type |
| Playback frequency band | 30 Hz to 45000 Hz |
| Max Input | 140W |
| Impedance | 6 Ω |
| Output sound pressure | 92dB/W/m |
| Crossover frequency | 450 Hz, 3000 Hz |
| Cabinet internal volume | 62L |
| External dimensions | Width 387x Height 694x Depth 334 mm |
| Weight | 21.5kg |