Altec Lansing 290C Compression Driver

The Altec Lansing 290C is a high-efficiency 2-inch compression driver made in the 1960s and 1970s as part of Altec's professional audio lineup. It was used in cinema, broadcast and high-fidelity sound reinforcement systems. It was commonly built into speaker systems such as the Altec A7 Voice of the Theatre, where its clarity and output capability helped define the sound of live and recorded audio in its time.

Specifications

Parameter	Specification
Manufacturer	Altec Lansing
Model	290C
Type	Compression Driver
Diaphragm Size	2 inches
Diaphragm Material	Aluminum (standard), phenolic (some variants)
Impedance	16 ohms
Sensitivity	Approximately 110 dB (1W/1m)
Frequency Response	Designed for high-frequency reproduction (system-dependent)
Horn Compatibility	Multicellular horns (e.g., 802C, 811B)
Power Handling	Not independently rated; system-dependent
Production Period	1960s–1970s
Intended Use	Professional audio, theater, high-fidelity

Historical Context

The 290C arrived when high-efficiency horn systems dominated professional sound. It succeeded earlier drivers like the 285C and 286C, with improved power handling and extended high-frequency response. That made it a fit for movie theaters, public address systems and studio monitoring.

Its most famous application was the Altec A7 Voice of the Theatre speaker system, a biamped configuration that paired the 290C with a 15-inch low-frequency driver and a passive crossover. The A7 became a benchmark for sound clarity and dynamic range. Cinemas adopted it widely, and audiophiles later took it up for home use.

The 290C was designed for reliability and sonic precision. It has a sturdy voice coil and a phase plug optimized for use with multicellular horns. Those horns reduced high-frequency diffraction and improved dispersion, which contributed to the driver's reputation for clarity and punch.

Sound Signature

The 290C has a bright, articulate, dynamic high-frequency response with strong midrange presence. Its high sensitivity lets it reach high sound pressure levels with relatively low amplifier power, which suits it to tube amplifiers.

However, the driver’s forward character can become harsh if mismatched with improper horns or crossovers. When properly integrated—especially with Altec’s 802C or 811B multicellular horns—the 290C reveals its true potential: detailed, lively, and immersive sound with excellent transient response.

Maintenance and Restoration Tips

Because of their age, vintage 290C units often need servicing to restore proper performance. Common issues include:

Diaphragm degradation: Aluminum diaphragms may fatigue or corrode over time, leading to distortion or failure. Replacement with original-spec or modern phenolic diaphragms is recommended.
Magnet weakening: Older units may have weakened magnetic fields. Remagnetizing the driver restores sensitivity and efficiency.
Adhesive and seal deterioration: Aging adhesives in the voice coil assembly or phase plug can cause mechanical noise. Re-coning or professional servicing may be necessary.
Corrosion and oxidation: Check terminals and internal wiring for signs of corrosion. Clean contacts and replace damaged leads as needed.

For best results, pair the 290C with period-correct horns and crossovers. Modern restoration services specialize in Altec drivers and can provide rebuilds using original materials and techniques.

Collectibility and Market Value

The Altec 290C appeals to vintage audio enthusiasts, particularly those restoring Voice of the Theatre systems or building high-efficiency horn speakers. Its collectibility is rated 7/10, based on its historical significance and sonic performance.

As of recent market trends, individual 290C drivers sell for $100 - $300, depending on condition, originality, and whether they have been restored. Units with original labels, unmodified coils and intact magnets command premium prices. Drivers paired with matching horns or sold as part of complete A7 systems can exceed $1,000.

Conclusion

The Altec Lansing 290C remains a cornerstone of vintage professional audio. Its combination of high efficiency, clarity, and durability made it a favorite in both commercial and high-fidelity applications. While it demands careful integration and occasional restoration, the 290C continues to deliver a thrilling listening experience that modern drivers often struggle to match. For collectors and audiophiles alike, it represents a vital piece of audio history.