ELAC4 π -Plus
Price unknown (1 unit, around 1990)
Commentary
A tweeter system in which the 4 π ribbon tweeter mounted on the 213-4 π is made into a single unit.
It can be upgraded by connecting to a handheld speaker system.
This unit is designed to prevent high-frequency loss that is a problem in an actual room. It is a ring-shaped non-directional ribbon tweeter to compensate for sound absorption loss above approximately 4 kHz. The diaphragm is an ultra-lightweight 6-micron aluminum diaphragm, and moreover, it is highly rigid because it is not flat.
This unit has not only wide directivity, but also excellent pulse response, high input resistance that breaks the common sense of ribbon type, and has realized a tough structure. In addition, the directivity in the vertical direction is improved by adopting the horn shaped flange, and it has a unique shape that symbolizes 4 π (free space) technology.
Built-in high-pass filter with protection circuit and 3-step attenuator element.
The exterior has a black semi-gloss finish.
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Model Rating
| Type | Tweeter unit |
| Configuration | Add-on Tweeter |
| Units Used | 1.5x30cm ribbon tweeter |
| Crossover frequency | 4.5kHz |
| Frequency characteristic | 4.5 kHz to 35 kHz |
| Impedance | 4 Ω |
| Max Input | 170W |
| Output sound pressure level | 84dB/W/m |
| External dimensions | Width 125x Height 225x Depth 215 mm |
| Weight | 6kg |