Altec Lansing 311-60 Compression Driver & Horn System

Name: Altec 311-60
Brand: Altec

The Altec Lansing 311-60 is a legendary high-efficiency compression driver paired with a multicellular horn, designed for professional sound reinforcement and high-fidelity home audio applications. Produced from the 1950s through the 1970s, this system became a staple in cinemas, public address systems, and audiophile setups, contributing significantly to the sonic character of the mid-20th century "West Coast Sound."

Renowned for its clarity, dynamic range, and exceptional sensitivity, the 311-60 remains a sought-after component among vintage audio enthusiasts and restorers of classic sound systems.

Specifications

Parameter	Specification
Model	Altec Lansing 311-60
Type	Compression Driver with Multicellular Horn
Power Handling	10W–50W per channel (system dependent)
Impedance	16 ohms
Sensitivity	104–108 dB (1W/1m)
Driver Diaphragm	2-inch throat, aluminum diaphragm
Horn Design	Multicellular (rectangular) flare
Frequency Response	Optimized for midrange and high frequencies
Intended Use	Professional PA, theater, high-fidelity audio
Year of Production	1950s–1970s

Historical Context

The Altec Lansing 311-60 emerged during a golden era of audio engineering, when high-efficiency loudspeaker systems were essential for driving large venues without the benefit of modern high-power amplification. As part of Altec’s premium line of theater and professional audio equipment, the 311-60 was often paired with large bass enclosures (such as those using the 435 series woofers) to create full-range systems.

Its multicellular horn design provided controlled dispersion and reduced high-frequency distortion, making it ideal for both speech intelligibility and music reproduction. The 311-60 played a key role in shaping the sonic signature of movie theaters and live sound systems across North America.

Among audiophiles, the 311-60 became a hallmark of the "West Coast Sound"—a term associated with bright, dynamic, and detailed audio reproduction favored in California during the 1960s and 70s. Its use in iconic studios and broadcast facilities further cemented its reputation as a professional-grade standard.

Sound Signature

The 311-60 delivers a clear, punchy, and highly efficient sound with exceptional midrange presence and crisp high-frequency detail. Its high sensitivity allows it to perform well even with low-power tube amplifiers, making it a favorite in vintage hi-fi setups.

However, the driver’s brightness can become pronounced if not properly integrated into a system. Without careful crossover design or room equalization, the 311-60 can sound harsh or fatiguing, especially with bright source material. Proper horn placement and system matching are essential for balanced performance.

Maintenance and Restoration Tips

Due to its age, many 311-60 units in circulation today require inspection or restoration. Consider the following:

Diaphragm Inspection: The aluminum diaphragm can degrade over time, especially in humid environments. Look for signs of corrosion or wrinkling. Replacement diaphragms or reconing services are available from specialty audio restoration shops.

Horn Condition: Check the multicellular horn for cracks, warping, or paint degradation. Horn flare integrity is critical to proper waveguiding and sound quality. Clean gently with a soft cloth; avoid harsh chemicals.

Crossover and Wiring: If used in a multi-way system, verify the condition of the crossover network. Old capacitors and inductors may need replacement to ensure accurate frequency distribution and prevent damage to the driver.

Mounting and Sealing: Ensure the driver is securely mounted to the horn with a tight, airtight seal. Any air leaks between the driver and horn throat will reduce efficiency and degrade sound.

System Matching: Due to its 16-ohm impedance and high sensitivity, the 311-60 works best with amplifiers that can control its load without overdriving it. Pair with high-efficiency bass systems for optimal full-range performance.

Collectibility and Market Value

The Altec Lansing 311-60 is rated 7/10 in collectibility. While not as rare as some of Altec’s coaxial models, it remains a prized component among vintage audio collectors and restorers of classic theater systems.

Market Value: $200–$500 per driver/horn unit, depending on condition, originality, and finish.
Restored Units: Fully serviced and reconed drivers often command higher prices, especially when sold as part of matched pairs.
Demand Drivers: Authenticity, original labeling, and inclusion of mounting hardware or documentation can increase value.

Conclusion

The Altec Lansing 311-60 stands as a testament to mid-century audio engineering excellence. Its combination of high efficiency, professional durability, and sonic clarity ensures its continued relevance in vintage audio circles. Whether used in a restored theater system or a high-fidelity home setup, the 311-60 delivers a window into the golden age of sound—bright, bold, and unmistakably Altec.