Altec Lansing 411-8A (1970)
A 15-inch high-compliance woofer designed for extended low-frequency response in professional and high-fidelity audio systems
Overview
The Altec Lansing 411-8A is a 38 cm cone woofer unit released in 1970 by Altec Lansing. Designed for high power handling and high compliance, it was engineered to reproduce very low frequencies down to 16 Hz when paired with a sufficiently large sealed cabinet. With a 10 cm voice coil and an 8.2 kg magnet, the 411-8A delivers strong magnetic flux density of 9,300 gauss, supporting its role in demanding audio applications.
Specifications
| Driver size | 15 inches |
| Voice coil diameter | 10 cm |
| Cone size | 12-5/8 inches |
| Magnet weight | 8.2 kg |
| Frequency characteristic | 20 Hz to 1 kHz |
| Lowest resonance frequency | 18 Hz |
| Impedance | 8 Ω |
| Rated input | 60W |
| Magnetic flux density | 9,300 gauss |
| Recommended crossover frequency | 500Hz |
| External dimensions | Diameter 389 x Depth 140 mm |
| Weight | 9.0 kg |
Design
The 411-8A is described as a high compliance and high power input woofer unit, utilizing a large voice coil and magnet in its magnetic circuit. Its design enables playback of extremely low frequencies, down to 16 Hz, when used with a large volume sealed cabinet.
Market
The 411-8A had an original price of ¥71,300 per unit around 1976.
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