Altec Lansing 806-8B High-Frequency Compression Driver

The Altec Lansing 806-8B is a high-frequency compression driver that defined the sound of professional audio systems throughout the 1960s and 1970s. It was known for clarity, efficiency and tough construction, and it was a cornerstone in both studio monitoring and cinema sound reinforcement. Vintage audio enthusiasts and DIY speaker builders still look for it.

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. It handled high power with low distortion, which suited demanding environments, from movie houses to recording studios.

Sound Signature

The 806-8B has a detailed and articulate high end with a smooth upper midrange presence. Its sound is often described as slightly forward, lively and engaging. Mated with a compatible horn and crossover, it gives excellent clarity and dynamic punch.

It is highly efficient and its response is extended, so it can sound bright or harsh on overly reflective horns or with poorly designed crossovers. Warmer midrange drivers, or damping material in the horn throat, can help balance it.

Common Issues and Maintenance Tips

The 806-8B is durable, but age still gets to it. Here are the 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 because of its 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 806-8B combines power, clarity and serviceability, and that has kept it around long past its production era. It remains a common choice for restoring an A7 system or building a vintage-inspired horn setup.

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