Altec Lansing 418B 15" Studio Woofer

Name: Altec 418B
Brand: Altec

The Altec Lansing 418B is a legendary 15-inch cast-frame woofer produced during the 1960s and 1970s, widely celebrated for its role in professional audio and high-fidelity speaker systems. As a key driver in the iconic A7 "Voice of the Theatre" and other premium enclosures, the 418B helped define the sonic character of an era—particularly the punchy, warm, and dynamic "West Coast sound" favored in studios, cinemas, and live sound applications.

With its robust construction, high sensitivity, and efficient performance, the 418B remains a sought-after vintage driver among audiophiles, restorers, and professional audio enthusiasts.

Specifications

Feature	Specification
Model	Altec Lansing 418B
Brand	Altec
Production Years	1960s–1970s
Driver Type	15-inch Woofer
Frame Construction	Cast Aluminum
Magnet Type	Alnico V
Cone Material	Paper with Accordion Edge Surround
Impedance	16 ohms
Power Handling	15W–50W per channel (system-dependent)
Sensitivity	98–100 dB (1W/1m)
Frequency Response	Optimized for bass in 2-way systems (with horn)
Typical Enclosure Use	2-way systems, often with A7 or similar horns
Weight	~18 lbs (8.2 kg)

Historical Context

The Altec Lansing 418B was a cornerstone of Altec’s professional audio lineup during the golden age of analog sound. Designed for durability and high output, it was commonly deployed in movie theaters, broadcast studios, and public address systems across the United States. Its integration into the A7 Voice of the Theatre speaker system cemented its legacy, delivering powerful, clear sound in environments where reliability and sonic clarity were paramount.

The 418B’s Alnico V magnet contributed to its high efficiency and dynamic transient response—qualities that distinguished it from later ceramic-magnet designs. Its use in both commercial and high-end consumer applications made it a symbol of American audio engineering excellence during the mid-20th century.

Collectors and audio historians often cite the 418B as a defining component of the "West Coast sound"—a sonic signature characterized by forward mids, punchy bass, and lively dynamics, in contrast to the more neutral "East Coast" designs of the time.

Sound Signature

The 418B delivers a warm, energetic, and rhythmically precise low end, with excellent mid-bass articulation. Its high sensitivity allows it to perform well even with low-powered tube amplifiers, making it a favorite in vintage hi-fi setups. When paired with a suitable high-frequency horn (such as the 515C or 802), the 418B produces a balanced, immersive soundstage with a natural presence that many modern drivers struggle to replicate.

Its paper cone and accordion surround contribute to a smooth, organic tonality, while the Alnico magnet provides quick magnetic response and low distortion at moderate volumes.

Maintenance and Restoration Tips

Due to its age, the Altec 418B often requires maintenance to restore optimal performance:

Surround Replacement: The original cloth or foam accordion surrounds frequently degrade over time. Refoaming or replacing with modern equivalents is common and can significantly improve performance.
Magnet Recharging: Alnico magnets can lose strength with age or physical shock. Some specialists offer magnet recharging services to restore original flux levels.
Voice Coil Inspection: Check for rubbing or misalignment, especially if the speaker has been dropped or overdriven. Re-coning services are available from vintage speaker specialists.
Cleaning: Use a soft brush and mild cleaner for the basket and cone. Avoid moisture near the voice coil or magnet gap.
Originality vs. Restoration: Purists value original, unmodified units with factory labels intact. Fully restored units may perform better but may have lower collectible value.

Market Value and Collectibility

The Altec 418B holds strong appeal in the vintage audio market:

Market Value: $150–$400 per driver, depending on condition, originality, and provenance
Collectibility Rating: 8/10 — Highly desirable for restorations, A7 builds, and vintage PA projects
Demand Drivers: Use in authentic A7 replicas, studio monitor restorations, and high-efficiency speaker builds

Units with original labels, date stamps, and unmodified Alnico magnets command premium prices, especially in the audiophile and pro-audio restoration communities.

Conclusion

The Altec Lansing 418B is more than just a vintage woofer—it's a piece of audio history. Its combination of engineering excellence, sonic character, and cultural impact ensures its continued relevance in both professional and enthusiast circles. Whether you're restoring a classic A7 or building a high-efficiency vintage-inspired system, the 418B remains a benchmark in dynamic, engaging sound reproduction.