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.