Altec Lansing 515B (1966)
A 38 cm cone woofer unit designed for high-performance horn-loaded and vented enclosures
Overview
The Altec Lansing 515B is a 38 cm cone woofer unit released in 1966, part of the 515-G series known for its robust low-frequency performance. Built for professional and high-fidelity audio applications, it was engineered for high-performance horn-loaded and vented enclosures. The 515B is a variant within a broader family that includes the 515C and 515-8G, with the 515B serving as a primary model supported by detailed pricing and technical documentation from the 1970s.
Specifications
| Frequency characteristic | 20 Hz to 1 kHz |
| Lowest resonance frequency | 25Hz |
| Impedance | 16 Ω |
| Rated input | 35W |
| Allowable input | 50W |
| Output sound pressure level | 105dB/W/m |
| Magnetic flux density | 14,750 gauss |
| Recommended crossover frequency | 500Hz |
| Voice Coil Diameter | 76mm |
| External dimensions | Diameter 389 x Depth 197 mm |
| Weight | 11.8kg |
Design
The 515B features a magnetic circuit using Alnico V, optimized for horn loading. It can be installed in front-load type cabinets such as the 825B (A7). The 515-G series, including this model, was designed for superior performance in low-frequency horn and vented horn enclosures, with the 515-8G variant specifically offering extended bass and high linearity for vented applications.
Market
The 515B was priced at ¥77,000 around 1970, rising to ¥88,200 after a price revision, and reached ¥90,300 by around 1976. These figures reflect its position as a premium driver in Altec Lansing’s lineup during the 1970s.
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