AR(Acoustic Research) AR-93
¥ 98,000 (1 unit, around 1980)
Commentary
This hightech series floor-type speaker system inherits the technology of the Vertical Series.
Two 20 cm cone type woofers are installed in the lower range.
The woofer units are secured to both sides of the enclosure, an arrangement inherited from the AR9 reference model that protects against the wall dip that floor speakers often experience. The wall dip is a phenomenon in which sound from 200 Hz to 300 Hz is offset by the sound reflected from the floor, reducing the sound pressure level. It provides the unique low-distortion bass of dual woofer independent of the sound reflected from the floor.
The mid-range is equipped with a 20 cm cone type mid-range.
A sub-enclosure is mounted inside the enclosure to prevent mutual interference with the woofer unit.
A 3.2 cm dome type tweeter is installed in the high range.
By injecting a magnetic fluid between the pole piece and yoke, the power handling capability is improved. This magnetic fluid guides the voice coil naturally to the center axis of the pole piece, improving the accuracy of the unit and enabling playback with less distortion. The magnetic fluid is a mixture of colloidal binder and fine metal particles, and the fluid moves according to the strength of the magnetic field.
In addition, an acoustic blanket is attached around the tweeter to absorb middle and high sound coming around the edge of the enclosure and to suppress the irregular reflection of sound.
A 17 AWG air-core coil and an electrolytic capacitor are used in the network section.
The enclosure is made of high-density particle board material with black mold finish on the top panel and legs, and a black net with excellent acoustic transparency on the side including the front baffle.
The inner system uses the traditional acoustic suspension system, and the air inside the fully enclosed enclosure acts as a spring to support the cone to improve bass reproduction.
.JPG)
Model Rating
| Method | 3-way, 4-speaker, acoustic suspension system, floor type |
| Units Used | For low band : 20 cm cone x2 For Medium Range : 20 cm cone type For high-pass : 3.2 cm dome type |
| Low reproduction frequency | 44Hz -3dB |
| System Q | 0.9 |
| Output sound pressure level | 87dB/W/m |
| Impedance | 6 Ω (minimum 4.5 Ω) |
| Continuous allowable input | 125W |
| Crossover frequency | 350 Hz, 2 kHz |
| Internal volume | 50L |
| External dimensions | Width 356x Height 778x Depth 273 mm |
| Weight | 23kg |