Altec Lansing 938-8AE 8-Ohm Compression Driver
The Altec Lansing 938-8AE is a professional 1-inch exit compression driver from the 1960s - 1970s. It was used in cinema, public address (PA) and studio monitoring systems. It was a key component in Altec's "Voice of the Theatre" and "Mantaray" horn systems. Sensitivity is high and transient response is excellent.
Specifications
| Parameter | Specification |
| Model | 938-8AE |
| Brand | Altec Lansing |
| Year of Production | Likely 1960s–1970s |
| Driver Type | 1-inch exit compression driver |
| Impedance | 8 ohms |
| Sensitivity | ~110–112 dB (1W/1m) |
| Diaphragm Material | Aluminum (standard), phenolic (some variants) |
| Power Handling | Not officially rated; designed for high-power amplifiers |
| Frequency Response | Optimized for use with multicell/sectoral horns (typically 1.5–16 kHz) |
| Intended Horn Match | Altec multicell or sectoral horns (e.g., 802, 811, 817 series) |
| Mounting | 1.75-inch threaded mount (standard Altec) |
Historical Context
The 938-8AE came along when theaters, concert venues and broadcast studios wanted reliable, high-output sound reinforcement. It followed earlier 938-series drivers, and the 8AE variant was built for durability and clarity at high SPL. It was commonly paired with Altec's multicell horns, such as the 802B or 811, to form the high-frequency section of the "Voice of the Theatre" systems.
These systems became the standard in movie theaters across the United States and influenced the design of modern cinema sound. The 938-8AE's efficiency and forward midrange presence let it cut through dense acoustic environments, which kept dialogue clear and music dynamic. It also went into live sound reinforcement, studio foldback, and even early rock concert systems.
The driver has a field coil or permanent magnet structure (depending on variant), a lightweight aluminum diaphragm, and a high-temperature voice coil that can take prolonged high-power operation.
Sound Signature
The 938-8AE sounds like a classic Altec driver: clear, punchy and slightly bright. The midrange presence is pronounced, which helps vocal intelligibility and instrument definition for speech and music alike. Transient response is fast and articulate. With an appropriate horn, it has smooth dispersion and extended high-frequency output, though it is typically rolled off below 1.5 kHz to avoid distortion.
Many audiophiles and vintage sound enthusiasts like the 938-8AE for its "live" character. It is less polished than modern drivers but more dynamic and expressive in the right system.
Maintenance and Restoration Tips
Because of its age, the Altec Lansing 938-8AE may need maintenance to perform its best:
- Diaphragm Inspection: Check for signs of fatigue, warping, or corrosion. Aluminum diaphragms can oxidize or develop micro-cracks over decades. Replacement diaphragms (original or modern reproductions) are available from specialty vendors.
- Remagnetization: If output seems weak, the magnet may have degraded. Recharging the magnetic circuit with a magnetizer can restore efficiency.
- Terminal Care: Clean input terminals and replace corroded wiring. Use high-temperature solder and braided leads for reliability.
- Horn Compatibility: Ensure the driver is paired with a compatible Altec horn. Mis-matching can lead to poor dispersion or frequency response anomalies.
- Avoid Overpowering: While robust, the 938-8AE should not be driven with excessive high-frequency energy. Use a passive or active crossover to protect the driver.
Restored units often end up in vintage PA restorations, home audio systems with horn cabinets, and collections of classic professional gear.
Collectibility and Market Value
The Altec 938-8AE has a collectibility rating of 7/10. Its link to legendary sound systems, plus solid build quality and sound, makes it sought after among vintage audio enthusiasts. Units with original phenolic diaphragms or factory markings are especially desirable.
Going by recent market trends, individual drivers sell for $100 - $300, depending on condition, diaphragm type, and completeness. Drivers in working order with original hardware command premium prices, particularly when sold as a matched pair or with original horns.
Conclusion
The Altec Lansing 938-8AE stands as a testament to mid-20th-century audio innovation. More than just a component, it was a cornerstone of professional sound for decades. Whether used in a restored theater system or integrated into a high-efficiency home audio setup, the 938-8AE continues to deliver the dynamic, expressive sound that defined an era. For collectors and audiophiles alike, it remains a worthy emblem of Altec’s enduring legacy.
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