Electro-Voice SENTRY IVB
¥ 398,000 (1 unit, around late 1970 s)
Commentary
An all-horn speaker system developed based on innovative design concepts.
Two 30-cm cone-shaped woofers are installed in the lower range, making up a folded horn with a cutoff frequency of 50 Hz.
A radial horn type mid-range with a radiation angle of 120 degrees or more is adopted for the mid-range, and 1823M is installed as a driver unit.
The ST350A, a radial horn type tweeter with a radiation angle of 120 degrees or more, is mounted in the high range.
The tweeter also has a self-resetting, purely electronic protection circuit and a 4-step switch for 1 Hz or higher response.
Model Rating
| Method | 3-way, 4-speaker, all-horn system, floor type |
| Unit | For low band : 30 cm cone x2 For Middle Range : Horn Type (1823M) For High Range : Horn Type (ST350A) |
| Frequency characteristic | 50 Hz to 18 kHz ± 3 dB |
| Output sound pressure level | 98dB/W/m |
| Impedance | 8 Ω |
| Maximum allowable input | 50W (long average) 500W (peak) |
| Crossover frequency | 400 Hz, 3.5 kHz |
| External dimensions | Width 705x Height 1,290x Depth 523 mm |
| Weight | 67.0kg |