Altec Lansing 1505 Compression Driver with Multicellular Horn

Name: Altec lansing-1505
Brand: Altec

The Altec Lansing 1505 is a legendary high-frequency compression driver paired with a multicellular horn, representing the pinnacle of mid-20th century professional audio engineering. Widely celebrated for its exceptional efficiency, clarity, and dynamic presence, the 1505 was a cornerstone in Altec’s “Voice of the Theater” (VOTT) speaker systems and found widespread use in cinemas, broadcast studios, and high-fidelity home audio setups during the 1950s through the 1970s.

Even today, the 1505 remains highly sought after by vintage audio enthusiasts, restorers, and audiophiles seeking the authentic sound of a bygone golden era in audio reproduction.

Specifications

Parameter	Specification
Model	Altec Lansing 1505
Year of Production	1950s–1970s
Driver Type	Compression driver with multicellular horn
Magnet Type	Alnico (Aluminum-Nickel-Cobalt)
Diaphragm Size	1.4-inch throat
Impedance	16 ohms
Power Handling	15W–100W (depending on system configuration)
Sensitivity	~110 dB (1W/1m)
Frequency Response	500 Hz – 16 kHz (typical with crossover)
Horn Design	Multicellular (rectangular)
Intended Use	Professional sound, studio monitoring, home hi-fi

Historical Significance

The Altec Lansing 1505 was developed during the golden age of American loudspeaker design and served as a critical high-frequency component in many of Altec’s flagship systems, most notably the iconic Voice of the Theater (VOTT) series. These systems were standard equipment in movie theaters across the United States and provided the sonic backbone for early surround sound and cinematic audio experiences.

The 1505 combined a high-efficiency alnico compression driver with a precision-engineered multicellular horn to deliver unmatched clarity, projection, and dynamic range for its time. Its design prioritized fidelity and power handling, making it ideal for both large venues and critical listening environments.

Due to its modular nature, the 1505 was also widely adopted by DIY audio builders and high-end manufacturers who integrated it into custom speaker cabinets, further cementing its legacy in the audiophile community.

Sound Signature

The Altec 1505 is renowned for its detailed, articulate midrange and crisp high-frequency response. Its high sensitivity allows it to produce dramatic dynamics even with low-powered tube amplifiers, making it a favorite among vintage amplifier owners.

However, the sound can be bright or forward if not properly integrated into a system. Optimal performance requires careful attention to crossover design, horn placement, and amplifier synergy. When well-matched, the 1505 delivers a lively, engaging, and transparent sound that brings vocals and acoustic instruments to life.

Maintenance and Restoration Tips

Given their age, most Altec 1505 units on the market today require some degree of inspection or restoration. Here are key considerations for maintaining or refurbishing a 1505:

Alnico Magnet Recharging: Over decades, alnico magnets can lose magnetic strength. Recharging the magnet restores efficiency and output. Specialized audio restoration shops offer this service.
Diaphragm Inspection: Check the titanium or aluminum diaphragm for tears, warping, or corrosion. Replacement diaphragms or reconing services are available from vintage audio specialists.
Horn Surface Care: Clean the multicellular horn with a soft brush and mild detergent. Avoid abrasive cleaners that can damage the original finish or alter acoustic properties.
Terminal and Wiring Check: Inspect input terminals and internal wiring for corrosion or breakage. Replace with period-correct or high-quality modern equivalents if needed.
Proper Crossover Use: Always use with a suitable crossover (typically 500 Hz and above) to prevent low-frequency damage and optimize performance.

Collectibility and Market Value

The Altec Lansing 1505 scores 8 out of 10 in collectibility due to its historical importance, iconic status, and continued demand among vintage audio enthusiasts. Original, unmodified units in good condition command premium prices.

Market Value: $300–$800 per driver/horn set
Factors Affecting Value: Originality, condition of the diaphragm, magnet strength, finish, and provenance (e.g., theater or studio use)

Units with documented history or matching serial numbers from famous installations can exceed the upper end of this range.

Conclusion

The Altec Lansing 1505 is more than just a vintage driver—it's a piece of audio history. Its combination of engineering excellence, sonic character, and cultural impact ensures its enduring legacy. Whether used in a restored VOTT system or a modern high-fidelity setup, the 1505 continues to deliver a thrilling and authentic listening experience that few modern drivers can replicate.