Altec Lansing 806-8B High-Frequency Compression Driver

The Altec Lansing 806-8B is a legendary high-frequency compression driver that defined the sound of professional audio systems throughout the 1960s and 1970s. Revered for its clarity, efficiency, and robust construction, the 806-8B was a cornerstone in both studio monitoring and cinema sound reinforcement. It remains a sought-after component among vintage audio enthusiasts and DIY speaker builders for its iconic performance and historical significance.

Specifications

Parameter	Specification
Model	Altec Lansing 806-8B
Year of Production	1960s–1970s
Power Handling	50W RMS, 100W peak
Nominal Impedance	8 ohms
Sensitivity	110 dB (1W/1m)
Diaphragm Material	1.75-inch aluminum
Throat Size	1-inch exit
Phase Plug	Radial design for improved dispersion
Frequency Response	600 Hz – 16 kHz (typical, when horn-loaded)
Voice Coil Diameter	1.75 inches
Mounting Pattern	Standard 806-series horn interface
Weight	3.5 lbs (1.6 kg)

Key Features

Aluminum Diaphragm: The 806-8B features a 1.75-inch aluminum diaphragm, offering excellent transient response and durability.
Radial Phase Plug: Ensures smooth high-frequency dispersion and reduces distortion by managing sound wave interference.
Horn Loading Ready: Designed to be paired with a wide variety of exponential or constant-directivity horns for optimal performance.
High Sensitivity: At 110 dB efficiency, it delivers powerful output with minimal amplifier power.
Replaceable Components: The diaphragm and other internal parts are serviceable, with replacement parts still available from specialty vendors.

Historical Significance

The Altec 806 series, including the 806-8B, was a pivotal development in high-frequency driver technology. It evolved from the earlier 806 and 806A models (which used phenolic diaphragms) and became the preferred choice for high-fidelity and professional applications. Most famously, it was used in updated versions of the Altec A7 "Voice of the Theatre" speaker system, a benchmark in cinema and broadcast audio.

Altec’s dominance in theater sound during the mid-20th century was largely due to the reliability and sonic clarity of drivers like the 806-8B. Its ability to handle high power with low distortion made it ideal for demanding environments, from movie houses to recording studios. Even today, the 806-8B is celebrated for its authentic vintage sound and mechanical robustness.

Sound Signature

The 806-8B delivers a detailed and articulate high end with a smooth upper midrange presence. Its sound is often described as slightly forward, contributing to a lively and engaging listening experience. When properly mated with a compatible horn and crossover, it offers excellent clarity and dynamic punch.

However, due to its high efficiency and extended response, it can sound bright or harsh if used with overly reflective horns or poorly designed crossovers. Pairing it with warmer midrange drivers or using damping materials in the horn throat can help balance its character.

Common Issues and Maintenance Tips

Despite its durability, the 806-8B is not immune to age-related wear. Here are common issues and how to maintain them:

Diaphragm Fatigue or Tears: Over time, especially with high-volume use, the aluminum diaphragm may develop cracks. Fortunately, replacement diaphragms are still available and can be installed with proper tools and care.
Corroded Terminals: Check and clean the binding posts regularly. Use dielectric grease to prevent future oxidation.
Magnet Demagnetization: Rare, but possible after extreme thermal or mechanical abuse. Re-magnetization services are offered by specialty repair shops.
Dust and Debris: Keep the phase plug and diaphragm area clean using compressed air. Avoid direct contact with the diaphragm.
Proper Horn Matching: Always use with a correctly designed horn (e.g., 287-8C, 289-8B) to ensure optimal loading and frequency response.

Collectibility and Market Value

The Altec 806-8B scores 8/10 on the collectibility scale due to its iconic status, continued usability, and strong community support. Units in good working condition with original or new-old-stock diaphragms typically sell for $150 to $300 per driver, depending on finish, provenance, and included accessories.

Drivers with the earlier phenolic diaphragm (806A) are often more valuable to purists, but the 806-8B’s aluminum version offers better consistency and longevity.

Conclusion

The Altec Lansing 806-8B stands as a testament to mid-century American audio engineering. Its combination of power, clarity, and serviceability has ensured its survival long past its production era. Whether restoring a classic A7 system or building a vintage-inspired horn setup, the 806-8B remains a top-tier choice for those who value authentic, high-performance sound.