Altec Lansing 938-8AD 8-Ohm Compression Driver

The Altec Lansing 938-8AD is a vintage high-frequency compression driver built for professional sound reinforcement and cinema audio. It has an 8-ohm impedance and works with horn loading. It was likely used in systems that needed high sensitivity and clear projection, such as the "Voice of the Theatre" speaker arrays.

Specifications

Specification	Detail
Model	938-8AD
Brand	Altec Lansing
Year of Introduction	Circa 1975 (exact year unknown)
Impedance	8 ohms
Power Handling	Unknown
Sensitivity	Unknown
Frequency Response	Optimized for mid-to-high frequencies
Driver Type	Compression driver
Magnet Type	Likely Alnico (common in vintage Altec units)
Diaphragm Material	Likely phenolic resin
Mounting	Compatible with standard Altec horn flanges
Intended Use	Professional audio, cinema sound systems

Historical Context

The Altec Lansing 938-8AD belongs to a line of high-performance compression drivers from the heyday of cinema and live sound reinforcement. Altec Lansing was a dominant name in professional audio from the 1940s through the 1970s. It was best known for its "Voice of the Theatre" (VOTT) systems, which set the standard for clarity, efficiency, and durability in movie theaters and public address work.

The exact role of the 938-8AD in Altec's product lineup is not fully documented. Its 8-ohm design and construction suggest it went into multi-way systems where reliable high-frequency reproduction was critical. Drivers like this were often paired with large-format horns and complementary low-frequency cabinets to build full-range systems that could fill large venues with minimal amplification.

Altec's use of Alnico magnets and phenolic diaphragms contributed to a warm, articulate sound signature that remains sought after by vintage audio enthusiasts and restorers. The 938-8AD reflects the company's commitment to engineering for longevity and sonic integrity under demanding conditions.

Sound Signature

The 938-8AD has a classic horn-loaded sound with high efficiency, excellent transient response, and strong mid-to-high frequency projection. Users can expect:

Clarity and articulation in vocals and instruments
Extended high-frequency response with minimal distortion at high SPLs
A forward and dynamic presentation typical of vintage Altec drivers
Strong performance in speech intelligibility, making it ideal for cinema and PA use

Restored and paired with a suitable horn, the 938-8AD gives you the sound that defined professional audio for decades.

Maintenance and Restoration Tips

Because of its age, the Altec Lansing 938-8AD may need servicing to perform at its best. Common issues and recommended maintenance include:

Diaphragm Replacement: Aging phenolic diaphragms can become brittle or delaminate. Replacing with a modern reproduction or carefully restored original is often necessary.
Magnet Recharging: Alnico magnets can lose strength over time. Re-magnetizing can restore efficiency and output.
Voice Coil Inspection: Check for signs of overheating, warping, or misalignment. Re-coning services are available from specialty restoration shops.
Terminal and Wiring Check: Corrosion or loose connections at the terminal block can degrade performance. Clean and tighten as needed.
Horn Compatibility: Ensure the driver is mounted on a compatible horn (such as Altec 802, 811, or similar) to achieve intended frequency response and dispersion.

Regular inspection and conservative use will help preserve the driver, especially in active vintage audio systems.

Collectibility and Market Value

The Altec Lansing 938-8AD holds moderate collectibility, rated 7/10, because of its link to Altec's professional audio line and its potential use in restoration projects. It is not as well known as the 150-series or 285 drivers, but vintage PA and cinema speaker enthusiasts still value it.

Market Value: $100–$300 per driver, depending on condition, originality, and completeness
Demand: Steady among restorers and vintage audio hobbyists
Rarity: Moderate — not mass-produced for consumer markets, but not exceptionally rare

Drivers in original, unmodified condition with intact labels and hardware command higher prices.

Conclusion

The Altec Lansing 938-8AD is a testament to the engineering rigor and sonic excellence that defined Altec's professional audio division. While specific documentation is limited, its design and construction align with the standards of a company that shaped the sound of mid-century cinema and live sound. For collectors, restorers, and vintage audio enthusiasts, the 938-8AD offers both historical significance and the potential for exceptional performance when properly maintained.

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