Altec Lansing 288L Compression Driver

Name: Altec 288L
Brand: Altec

The Altec Lansing 288L is a legendary high-frequency compression driver that played a pivotal role in shaping the sound of professional audio from the 1950s through the 1970s. Renowned for its exceptional clarity, efficiency, and robust construction, the 288L was a core component in many of Altec’s flagship loudspeaker systems, most notably the iconic "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 remains a favorite among vintage audio enthusiasts, restorers, and high-end DIY speaker builders seeking authentic 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 specifically designed to pair with Altec’s multicellular horns, such as the 802 and 811, delivering unprecedented dispersion control and high-frequency clarity for its time.

Its most famous application was in the Altec 604 and 605 "Voice of the Theatre" loudspeakers, which were adopted by recording studios, movie theaters, and broadcast facilities worldwide. The 288L’s high sensitivity and dynamic response made it ideal for high-SPL environments where fidelity and reliability were critical.

The driver’s design emphasized durability and acoustic precision, featuring a rugged cast aluminum housing and a lightweight aluminum diaphragm that contributed to its fast transient response. Its influence extended beyond cinema and studio use, finding a place in early public address systems and high-fidelity installations.

Sound Signature

The 288L is known for its detailed, articulate high-frequency reproduction with a slightly bright character that enhances vocal presence and instrument definition. Its 110 dB sensitivity ensures effortless volume output with minimal amplifier power, making 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

When paired with appropriate horns and low-frequency drivers, the 288L delivers a balanced, lifelike soundstage that continues to impress modern audiophiles.

Maintenance and Restoration Tips

Due to its age, many 288L drivers in circulation today require 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, earning a collectibility rating of 8/10 among vintage audio enthusiasts. Its historical importance, build quality, and sonic performance ensure strong demand 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 stands as a benchmark in high-frequency driver design from the mid-20th century. Its combination of efficiency, clarity, and rugged construction made it a cornerstone of professional audio for decades. Today, it remains 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.