Electro-Voice Interface:2
¥ 50,000 (1 unit, around late 1970 s)
Commentary
This speaker system was developed based on the theory of Electrovoice's "interface-based optimal phase inversion system".
A 20 cm cone type woofer and a 25 cm cone type radiator are installed in the middle and low range.
This radiator is not equipped with a magnetic circuit or voice coil and works like a so-called passive radiator. However, Interface : 2 makes more active use of this radiator. The radiator is responsible for almost all of the lowest frequencies below 66 Hz. This realizes 39 Hz bass reproduction, while the 20 cm woofer achieves low distortion and high input resistance up to the mid-range.
A 6 cm tweeter is installed in the high range.
The enclosure is hermetically sealed.
Model Rating
| Method | 2-way, 2-speaker, passive radiator system ・ Bookshelf type |
| Unit | Low band : 25 cm cone radiator For Medium Range : 20 cm cone type High-pass : 6 cm |
| Frequency characteristic | 39 Hz to 20 kHz 47 Hz to 18 kHz ± 4 db |
| Output sound pressure level | 92dB/W/m |
| Impedance | 8 Ω |
| Maximum allowable input | 20W (long-term average) 200W (peak) |
| Crossover frequency | 66 Hz (acoustic), 1.5 kHz |
| External dimensions | Width 349x Height 616x Depth 286 mm |
| Weight | 11.4kg |