Infinity RS-7
A Kappa Series floor-standing speaker system with EMIT-K tweeter and airtight enclosure, priced at ¥150,000 in Japan around 1988
Overview
The Infinity RS-7 is a floor-standing speaker from Infinity's Kappa Series. It is a three-way, three-speaker design in an airtight enclosure, built for extended frequency response and high power handling. You get a 30 cm cone woofer, a 7.6 cm dome midrange and an EMIT-K tweeter. The cabinet is high-density particleboard with a natural oak finish.
Specifications
| Model Rating Method | 3-Way, 3-Speaker, Airtight System, Floor Type |
| Woofer | 30 cm cone type |
| Mid-range | 7.6 cm dome type |
| Tweeter | Special Type (EMIT-K) |
| Impedance | 4 Ω ~ 6 Ω |
| Output sound pressure level | 88dB/W/m |
| Adaptive input | 40 ~ 200 Wrms |
| Frequency characteristic | 37 Hz to 45 kHz ± 3 dB |
| Crossover frequency | 800 Hz, 4.5 kHz |
| External dimensions | Width 430 x Height 939 x Depth 304 mm |
| Weight | 31 kg |
Design
The woofer cone is 30 cm, a mixed structure of graphite fiber and polypropylene, made by injection molding and mounted in a cast frame. The 7.6 cm midrange dome has a polypropylene diaphragm, designed to be light and fast. The tweeter is an EMIT-K, an improved EMIT design. It has an ultra-thin film diaphragm and a rare-earth neodymium magnet in a push-pull configuration. The crossover uses special polypropylene capacitors. The enclosure is high-density, low-resonance particleboard with an acoustic matte coating and a round baffle, finished in natural oak.
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