Altec 605 (1965-1966)
A coaxial duplex driver introduced in 1965-1966, designed for professional and high-fidelity audio applications.
Overview
The Altec 605 is a coaxial duplex driver, combining a 38 cm (15") cone woofer and a multicellular horn tweeter in a single point-source design. Released in 1967, the 605B variant was developed as a successor to earlier Duplex models, sharing design similarities with the 604E but with modifications to the magnetic circuit. It was used in both studio and high-end consumer systems, including the Altec Lansing Crescendo floor-standing cabinet. The unit delivers full-range audio performance with a frequency response from 20 Hz to 20 kHz and was valued for its phase coherence and bass extension.
Specifications
| Type | 2-way 38 cm coaxial speaker unit (Duplex driver) |
| Low band unit | 38 cm cone type |
| High frequency unit | Horn Type (coaxial) |
| Frequency characteristic | 20 Hz to 20 kHz |
| Lowest resonance frequency | 25Hz |
| Impedance | 8 Ω, 16 Ω |
| Rated input | 35W |
| Allowable input | 50W |
| Magnetic flux density (low band) | 11,000 gauss |
| Magnetic flux density (high pass) | 14,000 gauss |
| Crossover frequency | 1.6kHz |
| External dimensions (605B) | Diameter 389x Depth 254 mm |
| Weight (605B) | 12.7kg |
Design
The 605B uses a coaxial configuration with a 38 cm cone woofer and a multicellular horn for high frequencies, mounted on the same axis to achieve point-source sound reproduction. Its design is similar to the 604E, with differences in the magnetic circuit affecting start-up characteristics. The unit is part of Altec’s Duplex driver series, known for studio-grade accuracy and robust construction.
Context
The 605B was released in 1967 as part of Altec’s professional monitor lineup, alongside the legendary 604 series. It was designed for use in systems like the Crescendo, a bass reflex floor speaker developed specifically for the 604E and 605B drivers. Models like the 604 and 605 became studio standards, defining "the Altec sound" with their point-source imaging and dynamic range.
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