Altec Lansing 288L Compression Driver
The Altec Lansing 288L is a high-frequency compression driver that shaped the sound of professional audio from the 1950s through the 1970s. It was clear, efficient and built tough. It went into many of Altec's flagship loudspeaker systems, most notably the "Voice of the Theatre" (VOTT) series used in cinemas, broadcast studios, and live sound reinforcement.
With its high sensitivity and extended frequency response, the 288L is still a favorite with vintage audio enthusiasts, restorers, and high-end DIY speaker builders who want mid-century sound reproduction.
Specifications
| Parameter | Specification |
| Model | Altec Lansing 288L |
| Type | High-frequency compression driver |
| Power Handling | 50W RMS |
| Impedance | 16 ohms |
| Sensitivity | 110 dB (1W/1m) |
| Frequency Response | 500 Hz – 16 kHz |
| Diaphragm | 2-inch aluminum |
| Throat Size | 2-inch |
| Horn Compatibility | Multicellular horns (e.g., 802, 811) |
| Construction | Cast aluminum body |
| Terminal Type | Screw terminals |
| Weight | 4.5 lbs (2.04 kg) |
| Production Years | 1950s – 1970s |
Historical Significance
The Altec 288L was developed during a golden era of audio engineering and quickly became a standard in professional sound environments. It was designed to pair with Altec's multicellular horns, such as the 802 and 811, and for its time it gave unusually good dispersion control and high-frequency clarity.
Its most famous application was in the Altec 604 and 605 "Voice of the Theatre" loudspeakers, which recording studios, movie theaters, and broadcast facilities adopted worldwide. The 288L's high sensitivity and dynamic response suited high-SPL environments where fidelity and reliability were critical.
The design favored durability and acoustic precision. The housing is rugged cast aluminum, and the diaphragm is lightweight aluminum, which helped its fast transient response. It also found a place in early public address systems and high-fidelity installations, not just cinema and studio work.
Sound Signature
The 288L is known for detailed, articulate high-frequency reproduction with a slightly bright character that helps vocal presence and instrument definition. Its 110 dB sensitivity gives plenty of volume from minimal amplifier power, which makes it highly efficient.
Listeners often describe the sound as:
- Clear and transparent in the upper mids and highs
- Dynamic and responsive to transients
- Slightly forward in the upper register, which can add "sparkle" but may require careful system matching
Paired with appropriate horns and low-frequency drivers, the 288L delivers a balanced, lifelike soundstage.
Maintenance and Restoration Tips
Because of its age, many 288L drivers in circulation today need inspection or restoration. Here are key considerations for maintaining or restoring a 288L:
1. Diaphragm Inspection
- The aluminum diaphragm can develop fatigue cracks or corrosion over time.
- If the driver produces distortion or rattling, the diaphragm may need replacement.
- Re-coning services specializing in vintage drivers can restore original performance.
2. Terminal and Wiring Check
- Corrosion on the screw terminals is common. Clean with electrical contact cleaner and a small wire brush.
- Inspect internal wiring for brittleness or breaks, especially near solder joints.
3. Magnet Strength
- Over decades, the Alnico magnet may weaken, reducing efficiency and sensitivity.
- A gauss meter can test magnet strength; remagnetization services are available for vintage drivers.
4. Horn Compatibility
- Always pair with a compatible multicellular horn (e.g., Altec 802, 811) for optimal dispersion and frequency response.
- Ensure a tight, sealed fit between driver and horn throat to prevent acoustic leakage.
5. Cleaning
- Use a soft brush and compressed air to remove dust from the diaphragm and throat.
- Avoid liquids or sprays near the motor structure.
Collectibility and Market Value
The Altec 288L is highly collectible, with a collectibility rating of 8/10 among vintage audio enthusiasts. Its historical importance, build quality, and sonic performance keep demand strong in the secondary market.
- Market Value: $300 – $600 per driver, depending on condition, originality, and provenance
- Premium is paid for original finishes, intact labels, and matching-number units from documented studio or theater installations
Restored units with new diaphragms also command strong prices, especially when paired with original horns.
Conclusion
The Altec Lansing 288L is a benchmark in high-frequency driver design from the mid-20th century. Efficiency, clarity, and rugged construction made it a cornerstone of professional audio for decades. Today it is still a prized component for vintage audio restoration, studio monitoring replicas, and high-efficiency speaker projects.
Whether you're restoring a classic Voice of the Theatre system or building a high-sensitivity horn setup, the 288L delivers a sonic experience that few modern drivers can replicate — a true legend of audio engineering.
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