ONKYO M88
¥ 49,800 (1 unit, released in 1980)
Commentary
This is a speaker system that aims to realize a powerful and refreshing reproduction sound rich in nuance expression through the expansion policy of 3 points of dynamic range, reproduction frequency range and listening area.
A 28 cm cone type woofer is installed in the low range using a rotary sheet-making cone.
This diaphragm is made of cone paper in which fibers that used to be randomly piled up are arranged in concentric circles to maintain a fixed orientation by a special sheet-making method. In addition to the stiffness, this diaphragm is also impregnated with a special resin to increase the strength in particular, resulting in high power and high efficiency. At the same time, this diaphragm effectively prevents bell vibration, which causes odd order harmonics, which are harmful to hearing.
The drive section consists of a magnetic circuit using a 120 φ x60 φ x15mm magnet and a three layer long voice coil with a large driving force. As a result of adopting a polyimide bobbin with excellent heat resistance, an allowable input increase of 25% has been achieved compared with conventional products.
In addition, strong aluminum die-cast frame is used for the frame.
A 10 cm cone type skoker using the same mixed cone as M90 is used for the middle area.
The diaphragm has a lightweight mass of 0.37g and high rigidity, enabling wide-band reproduction.
In addition, by installing a 0.54L back chamber, the reproduction capability in the low range is improved.
A 3 cm direct drive type tweeter is installed in the high range.
This unit directly drives a special diaphragm formed by etching an annular voice coil pattern on a film consisting of 12.5 μ m polyimide foil and 20 μ m aluminum foil.
Since the diaphragm has a lightweight mass of 26 mg and the high rigidity of the material is utilized, the playback upper limit frequency is extended to 70 kHz, and high input resistance is also realized.
In addition, uniform directional characteristics are secured in all directions by the shape of the annular diaphragm itself and the adoption of precision processing equalizer.
The network is designed with an emphasis on connections between units, and the optimal network constants and unit configurations are determined by utilizing computer simulations and repeated audibility tests.
Level control is installed in the high and middle range.
In the enclosure, the shape of the bass reflex port is designed to improve low-frequency characteristics, and the acoustic resistance is controlled by installing a damping material on the front surface.
Model Rating
| Method | 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type |
| Units Used | For Low Band : 28 cm Cone Type (W3041C) For Middle Range : 10 cm Cone Type (MD1011A) For High Range : 3 cm Direct Drive Type (TW322A) |
| Playback frequency band | 34 Hz to 70000 Hz |
| Max Input | 100W |
| Instantaneous maximum input | 800W |
| Impedance | 6 Ω |
| Output sound pressure level | 92dB/W/m |
| Crossover frequency | 700 Hz, 4500 Hz (12dB/oct for W, MD, and TW) |
| Cabinet internal volume | 45L |
| External dimensions | Width 320x Height 625x Depth 325 mm |
| Weight | 17.5kg |