Altec Lansing 418 15-Inch Alnico Woofer
The Altec Lansing 418 is a 15-inch cast-frame woofer made during the 1960s and 1970s as part of Altec's 400 Series. It has high efficiency, sturdy construction and an articulate sound. The 418 turned up in professional studio monitors, cinema sound systems and high-fidelity home audio setups. Engineers and audiophiles both favored it.
Specifications
| Parameter | Specification |
| Model | Altec Lansing 418 |
| Driver Size | 15 inches (380 mm) |
| Frame Type | Cast aluminum |
| Magnet Type | Reportedly Alnico V |
| Voice Coil | Reportedly 2-inch edgewound |
| Power Handling | Reportedly 40–60W program power |
| Nominal Impedance | Reportedly 16 ohms |
| Sensitivity | Reportedly 98 dB (1W/1m) |
| Frequency Response | Reportedly 40 Hz – 2.5 kHz (typical) |
| Surround | Cloth roll |
| Recommended Enclosure | Horn-loaded or sealed (varies by system) |
| Weight | Reportedly ~18 lbs (8.2 kg) |
Historical Context
The 418 was a key part of the 400 Series lineup, which included complete speaker systems like the A-7 and the 604 Duplex. Altec designed it for professional work, and it was built to give reliable, high-output performance in recording studios, movie theaters and live sound reinforcement.
Its Alnico V magnet and 2-inch edgewound voice coil contributed to exceptional efficiency and dynamic range—critical attributes in an era before high-powered amplifiers became commonplace. The 418’s 16-ohm impedance also made it ideal for use in constant-voltage distributed audio systems, commonly used in commercial installations.
The 418 is over half a century old and still highly regarded for its musicality and build quality. Many vintage audio enthusiasts restore classic cabinets to feature the 418 as the centerpiece, for its warm, natural tonal balance.
Sound Signature
The Altec 418 has a warm, articulate midrange and a solid, punchy bass response. Its high sensitivity lets it work very well with low-powered tube amplifiers, which made it a favorite among vintage audio fans.
It does not reach as deep into the sub-bass as modern woofers do. Its performance in the 50-200 Hz range is tight and musical. Paired with a suitable horn or enclosure, such as the Altec 1105 or 1117, it has excellent transient response and dynamic expression. The Alnico magnet contributes to a smooth, organic character that many describe as "alive" or "effortless."
Maintenance and Restoration Tips
Because of its age, the Altec 418 may need maintenance to restore optimal performance:
- Reconing: Over time, the original cloth surround may degrade or lose flexibility. Professional reconing services can restore the driver to like-new condition using period-correct materials.
- Magnet Recharging: Alnico magnets can lose strength over decades. Specialized services can re-magnetize the Alnico V assembly to restore full efficiency and output.
- Voice Coil Inspection: Check for rubbing or misalignment, especially if the speaker has been stored improperly. A simple tap test and visual inspection can reveal issues.
- Cleaning: Use a soft brush and mild cleaner for the frame and cone. Avoid solvents that may damage the cloth surround or cone coating.
- Proper Break-In: After restoration, allow for a gentle break-in period (12–24 hours of low-level playback) to recondition the suspension.
Collectibility and Market Value
The Altec Lansing 418 is considered a collectible driver and earns a 7/10 on the collectibility scale. Its appeal comes from its historical significance, build quality and sonic character. Drivers in original, working condition typically sell for $150 - $300 each, with higher prices for NOS (New Old Stock) or professionally restored units.
Enthusiasts often seek out 418s to restore vintage Altec systems or build high-efficiency speaker projects. Their compatibility with classic horn designs keeps demand going in the vintage audio market.
Conclusion
The 418 has a powerful Alnico motor and high sensitivity. It remains a sought-after driver for restorations and custom builds, in studio monitors, theater systems and home hi-fi setups, over 50 years after its debut.
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