INFINITY 2000 II (1975–1979)
A four-way floorstanding speaker system featuring a 360-degree radiating Walsh tweeter and dual top-panel options for acoustic tuning
Overview
The INFINITY 2000 II is a high-end speaker system developed by INFINITY during the mid-1970s. It builds on technologies derived from the Servo Static 1A, introducing audiophiles to passive radiator concepts and innovative dispersion control. This floorstanding speaker uses a four-way configuration with dedicated drivers for low, mid, middle-high, and high-frequency ranges. It stands out for its unique Walsh Tweeter, which radiates sound 360 degrees horizontally, creating an immersive soundfield that fills the room. A user testimonial from 1977 confirms its strong reception at launch, with listeners praising its immediate musical impact.
Specifications
| Model Rating Method | 4-way, 4-speaker floor type |
| Units Used For low band | 30 cm cone type |
| Units Used For Medium Range | 10 cm Cone Type |
| Units Used For Middle and High Areas | 2.5 cm Dome Type |
| Units Used For High Range | Special Type (Walsh Tweeter) |
| Frequency characteristic | 28 Hz to 28 kHz ± 4 dB |
| Impedance | 8 Ω |
| Allowable input Appropriate amplifier output | 25W or more (RMS/ch) |
| Allowable input Maximum input | 250W (RMS/ch) |
| Walsh-Tweeter diffusion Horizontal | 360 degrees |
| Walsh-Tweeter diffusion Vertical | 60 degrees |
| Crossover frequency | 800 Hz, 4 kHz, 10 kHz |
| Level control | For Middle Area |
| External dimensions | Width 565 x Height 927 x Depth 432 mm |
| Weight | 33.5 kg |
Design
The INFINITY 2000 II uses a 30 cm cone woofer with a specially coated diaphragm for the low band, a 10 cm cone midrange, and a 2.5 cm dome unit for middle and high frequencies. The high range is handled by a Walsh Tweeter, which operates on a unique principle: a vertically oscillating metal cone—shaped like an "ice cream cone" with striated lines and coated in a gold thin film—radiates sound as a cylindrical wave. This design differs fundamentally from conventional cone, electrostatic, ribbon, and ion drivers. The crossover network employs a Butterworth filter to ensure phase coherence and accurate transient response. The enclosure features a replaceable top panel: one with black fabric for sound diffusion matching the grille, and another in hand-finished oil-treated walnut for aesthetic integration.
Context
At a time when most high-end speakers relied on conventional dome tweeters with limited dispersion, Infinity pushed
Market
The INFINITY 2000 II came with a five-year warranty on parts and labor, reflecting its premium positioning. Originally priced at ¥199,000 around 1976, it was a significant investment, targeting serious audiophiles seeking advanced acoustic performance and innovative design.
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