Electro-Voice Interface:3
¥ 65,000 (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 30 cm cone type radiator are installed in the middle and low range.
This radiator does not have a magnetic circuit or voice coil and works like a so-called passive radiator. However, Interface : 3 makes more active use of this radiator. The radiator receives a low frequency range of less than 57 Hz. This realizes a low sound reproduction of 34 Hz, while the 20 cm woofer realizes low distortion and high input resistance up to the middle range.
A 6 cm tweeter is installed in the high range.
The 20 cm cone woofer and 6 cm tweeter are identical to the Interface : AII and Interface : BII.
The enclosure is hermetically sealed.
Model Rating
| Method | 2-way, 2-speaker, passive radiator system ・ Bookshelf type |
| Unit | Low band : 30 cm cone type radiator For Medium Range : 20 cm cone type High-pass : 6 cm |
| Frequency characteristic | 34 Hz to 20 kHz 40 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 | 57 Hz (acoustic), 1.5 kHz |
| External dimensions | Width 375x Height 679x Depth 317 mm |
| Weight | 15.0kg |