Altec Lansing 511B Horn

The Altec Lansing 511B is a multicell compression horn. It was designed in the 1950s and produced through the 1970s, and it ended up in recording studios, movie theaters, and high-fidelity audio systems. The construction is precision aluminum. It works with compatible drivers such as the Altec 802, 806, or 808.

Specifications

Feature	Specification
Model	511B Horn
Brand	Altec Lansing
Production Era	1950s–1970s
Type	Passive multicell horn
Construction	Cast aluminum
Crossover Frequency	500 Hz (typical)
Dispersion	90° horizontal × 40° vertical
Compatibility	Designed for use with Altec 802, 806, 808 compression drivers
Power Handling	N/A (depends on driver used)
Impedance	N/A (determined by driver)
Sensitivity	High efficiency (varies with driver; typically 108–112 dB/W/m with Altec drivers)
Weight	~15 lbs (6.8 kg)
Finish	Natural aluminum (may show patina with age)

Historical Significance

The Altec 511B was developed when sound reinforcement and cinematic audio needed reliable, high-output gear. It belongs to Altec's "Voice of the Theatre" series. It was engineered for controlled directivity and minimal distortion, which suited critical listening environments.

The multicell design uses a grid-like pattern of individual horn channels. That gives precise dispersion control, which reduces off-axis coloration and keeps coverage even across large venues. Broadcast studios, dubbing theaters, and live sound rigs all used the 511B throughout the mid-20th century.

Vintage audio enthusiasts and professional restorers still go after the 511B for the classic "West Coast" sound. That sound is a forward, dynamic midrange with crisp high-frequency articulation.

Sound Signature

Mated with original Altec drivers like the 802 or 808, the 511B sounds vivid and punchy, with strong presence. The aluminum throat and rigid structure keep resonance low and transient response fast. Vocals come through clearly and project well.

The 511B is highly efficient and has extended high-frequency response. Paired with modern drivers, or used without proper equalization, it can sound bright or harsh. Many users apply mild attenuation or use tube-based amplification to soften the top end and get a more balanced tone.

Common Issues and Maintenance Tips

The 511B is built to last, but decades of use and storage can lead to several common issues:

Aluminum Corrosion: Though resistant, the cast aluminum body can develop surface oxidation or pitting, especially in humid environments. Clean gently with a non-abrasive aluminum polish.
Denting or Warping: The horn's mouth is susceptible to dents during handling. Avoid physical impact and store securely.
Driver Compatibility and Condition: The horn itself is passive, but the compression driver is critical. Original Altec drivers may require reconing or diaphragm replacement. Always inspect the driver’s phase plug and surround before use.
Mounting Hardware Wear: Check U-brackets and mounting screws for fatigue or stripping. Replace with period-correct or reinforced hardware if necessary.
Dust and Debris: Clean the throat and cells carefully with compressed air or a soft brush to prevent obstruction.

Pro Tip: For best results, pair the 511B with a matching low-frequency enclosure (such as an Altec 604 or 605) and use a passive crossover set at 500 Hz. Bi-amping with modern DSP control can also tame brightness and improve integration.

Collectibility and Market Value

The Altec 511B horn has a collectibility rating of 8/10, based on its historical importance, build quality, and sonic character. Units in good condition, with original finishes and included drivers, typically sell between $200 and $500. Fully restored sets with working 808 drivers or rare finishes can exceed $600 in the collector market.

Enthusiasts value complete, matching-number systems. Horns sourced from decommissioned theaters or studios often carry a premium.

Conclusion

The Altec Lansing 511B is a benchmark in professional horn design. It is durable, and it has been used in vintage hi-fi setups and restored for studio monitoring.

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