Altec Lansing 1505 Compression Driver with Multicellular Horn
The Altec Lansing 1505 is a high-frequency compression driver paired with a multicellular horn. It was built in the mid-20th century for professional audio. It is known for its efficiency, clarity and dynamic presence. The 1505 was a cornerstone of Altec's "Voice of the Theater" (VOTT) speaker systems, and it turned up in cinemas, broadcast studios and high-fidelity home setups from 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. It served as the high-frequency component in many of Altec's flagship systems, most of all the Voice of the Theater (VOTT) series. These systems were standard equipment in movie theaters across the United States and carried the sound for early surround and cinematic audio.
The 1505 pairs a high-efficiency alnico compression driver with a precision-engineered multicellular horn. For its time it gave clarity, projection and dynamic range that few could match. The design put fidelity and power handling first, so it worked in large venues and in critical listening rooms.
The 1505 is modular, so DIY audio builders and high-end manufacturers adopted it widely and built it into custom speaker cabinets.
Sound Signature
The Altec 1505 is known for a detailed, articulate midrange and crisp high-frequency response. Its high sensitivity gives dramatic dynamics even with low-powered tube amplifiers, which is why vintage amplifier owners like it.
The sound can be bright or forward if the driver isn't properly integrated into a system. It needs careful attention to crossover design, horn placement and amplifier matching. When it's well matched, the 1505 sounds lively and transparent, and vocals and acoustic instruments come through well.
Maintenance and Restoration Tips
Given their age, most Altec 1505 units on the market today need some inspection or restoration. Here are the 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 because of its historical importance, its 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.
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