Altec Lansing H-811B: The Legendary Midrange Driver

Name: Altec H-811B
Brand: Altec

The Altec Lansing H-811B is a high-efficiency compression driver that became a cornerstone of professional audio systems during the mid-20th century. Revered for its clarity, power handling, and dynamic midrange performance, the H-811B was a key component in Altec’s iconic "Voice of the Theatre" (VOTT) speaker systems. Though originally developed in the 1950s and produced through the 1960s, its legacy endured well into the 1970s and beyond, influencing both studio monitoring and high-end home audio design.

Even decades after its discontinuation, the H-811B remains a sought-after driver among vintage audio enthusiasts, DIY speaker builders, and restorers of classic cinema and broadcast equipment.

Specifications

Parameter	Specification
Manufacturer	Altec Lansing
Model	H-811B
Type	1-inch exit compression driver
Impedance	16 ohms
Power Handling	Designed for 20–50W amplifiers (passive)
Sensitivity	~110 dB (1W/1m)
Frequency Response	Optimized for midrange (typically 800 Hz and up)
Crossover Frequency	800 Hz (recommended)
Diaphragm Material	Aluminum (early), phenolic (later versions)
Horn Design	Multicellular (rectangular)
Efficiency	Extremely high
Intended Use	Professional PA, cinema, studio, hi-fi

Historical Significance

The H-811B was a refined version of Altec’s earlier 802-series drivers and was engineered to deliver exceptional vocal clarity and midrange articulation. It was most famously used in the Altec A-7 and F-140 VOTT systems, which became the standard in movie theaters, recording studios, and live sound reinforcement throughout the 1950s and 1960s.

Its multicellular horn design minimized distortion and provided controlled dispersion, making it ideal for environments where speech intelligibility and dynamic range were critical. The H-811B’s 110 dB sensitivity allowed it to produce high sound pressure levels with relatively low amplifier power—making it a favorite in an era before high-wattage solid-state amplifiers.

Due to its widespread adoption and sonic excellence, the H-811B helped define the "Altec sound"—a balance of warmth, detail, and punch that remains highly regarded in vintage audio circles.

Sound Signature

The H-811B is renowned for its crisp, articulate midrange, particularly in vocal reproduction. Its high efficiency and fast transient response give it a lively, dynamic character that brings vocals and instruments to the forefront. When properly integrated into a system with a suitable woofer and crossover, it delivers a thrilling sense of presence and realism.

However, due to its forward midrange and high output capability, the H-811B can sound aggressive or fatiguing if mismatched with less refined woofers or poorly designed crossovers. It performs best in systems where the low-frequency driver and crossover network are carefully matched to balance its energetic character.

Maintenance and Restoration Tips

Given their age, many surviving H-811B units require inspection or restoration to perform optimally. Here are key considerations:

Diaphragm Condition: Early models used aluminum diaphragms, while later versions used phenolic. Phenolic diaphragms are prone to fatigue and cracking over time. Replacement diaphragms or reconing services are available from specialty vintage driver restorers.
Magnet Remagnetization: Alnico magnets can weaken over decades. If sensitivity is reduced, remagnetizing the driver can restore original performance.
Terminal Corrosion: Check and clean the binding posts or solder terminals. Corrosion can degrade signal transfer and cause intermittent connections.
Horn Throat Inspection: Ensure the throat is clear of debris or insect nests, which can obstruct sound and cause distortion.
Proper Loading: The H-811B must be used with a compatible multicellular horn. Using it without proper horn loading can damage the driver and result in poor sound quality.

Collectibility and Market Value

The Altec H-811B scores 8/10 in collectibility due to its iconic status, historical use, and continued demand among vintage audio enthusiasts. Units in original condition with aluminum diaphragms and unmodified horns command premium prices.

Market Value: $200–$500 per driver, depending on condition, originality, and diaphragm type.
Rarity: Moderate—fairly common in the surplus market, but NOS (New Old Stock) or fully restored units are rare and valuable.

Conclusion

The Altec Lansing H-811B stands as a landmark in audio engineering history. Its combination of high efficiency, clarity, and durability made it a workhorse in professional audio for decades. Today, it remains a prized component for restorations and custom speaker builds, offering a direct link to the golden age of sound reinforcement and high-fidelity reproduction.

For those seeking the authentic "Voice of the Theatre" experience or a transparent, dynamic midrange driver, the H-811B continues to deliver—decades after its prime.