Bang & Olufsen BeoLab CX50 (1979)

The Bang & Olufsen BeoLab CX50 is a classic two-way bookshelf speaker introduced in 1979 as part of B&O’s innovative CX series. Designed to complement flagship receivers like the Beomaster 1900, 2400, and 3400, the CX50 exemplifies the Danish brand’s commitment to minimalist Scandinavian design, modular integration, and acoustic innovation. With its distinctive Acoustic Lens tweeter and elegant beech wood finish, the CX50 remains a sought-after piece among vintage audio enthusiasts and design collectors.

Specifications

Feature	Specification
Model	BeoLab CX50
Brand	Bang & Olufsen
Year of Release	1979
Production Period	1979–1982
Type	2-way bookshelf speaker
Power Handling	60W maximum (per speaker)
Impedance	4 ohms
Sensitivity	86 dB (2.83V/1m)
Frequency Response	Not officially specified (estimated 60Hz–20kHz)
Tweeter	1" dome with Acoustic Lens technology
Woofer	6.5" mid-bass driver
Enclosure	Sealed (acoustic suspension)
Finish	Beech wood veneer
Mounting Options	Wall-mountable (integrated bracket)
Design Compatibility	Beomaster 1900, 2400, 3400 systems

Historical Context

The CX50 was a key component of Bang & Olufsen’s modular CX series, a line of audio components launched in the late 1970s that emphasized seamless integration, clean aesthetics, and user-friendly design. The CX series represented a shift toward system-based audio, where speakers, amplifiers, and tuners were engineered to work together harmoniously—both sonically and visually.

One of the CX50’s most notable innovations was the Acoustic Lens tweeter, a B&O proprietary technology designed to widen high-frequency dispersion. Unlike conventional tweeters that beam sound in a narrow arc, the Acoustic Lens diffused highs evenly across a broad listening area, enhancing stereo imaging and reducing "hot spots." This made the CX50 ideal for near-field listening and integration into living spaces where precise speaker placement wasn't feasible.

Designed by David Lewis, the CX50 reflects the minimalist ethos of Scandinavian design—functional, elegant, and timeless. Its modular nature allowed it to be paired with other CX components and wall-mounted to create a clutter-free audio environment, a radical concept at the time.

Sound Signature

The CX50 delivers a balanced and refined sound tailored for integration within B&O’s ecosystem:

Highs: Exceptionally clear and wide due to the Acoustic Lens, offering smooth treble without harshness.
Mids: Detailed and natural, ideal for vocals and acoustic instruments.
Bass: Modest but tight, typical of a sealed 6.5" design; best suited for small to medium rooms or near-field setups.

While not a bass-heavy speaker by modern standards, the CX50 excels in clarity and coherence, especially when paired with its intended Beomaster amplifiers. Its sound is optimized for intimate listening environments, making it perfect for apartments, studies, or minimalist living rooms.

Maintenance and Restoration Tips

Due to their age, vintage CX50 speakers may require maintenance to restore optimal performance:

Foam Surround Degradation: The original foam surrounds on the woofers commonly deteriorate over time, leading to distorted bass or complete failure. Refoaming by a specialist is recommended and widely available.
Acoustic Lens Cleaning: Dust can accumulate in the lens mechanism, affecting high-frequency dispersion. Gently clean with a soft brush or compressed air—avoid liquids or solvents.
Wood Veneer Care: The beech wood finish may show wear or fading. Use a quality wood polish for restoration, and avoid direct sunlight to prevent further discoloration.
Crossover Inspection: While generally reliable, older capacitors in the passive crossover may degrade. Consider a professional inspection if sound quality seems off.
Originality Preservation: For collectors, maintaining original drivers and finishes increases value. Document any repairs and retain original parts when possible.

Collectibility and Market Value

The BeoLab CX50 holds a collectibility rating of 7/10, driven by its iconic design, B&O heritage, and integration into a celebrated modular system. While not as rare as some B&O flagship models, the CX50 is appreciated for its blend of form and function.

Market Value: $150–$300 per pair, depending on condition, originality, and completeness (including wall mounts and grilles).
Demand: Steady among vintage audio collectors and interior design enthusiasts, particularly in Europe and North America.
Investment Potential: Moderate—value is stable but unlikely to surge significantly unless part of a complete CX system.

Conclusion

The Bang & Olufsen BeoLab CX50 is more than just a speaker—it’s a piece of audio history. Combining innovative Acoustic Lens technology with timeless Scandinavian design, the CX50 represents the golden era of high-fidelity modular audio. Whether used as part of a restored B&O system or displayed as a design object, the CX50 continues to captivate with its elegance and sonic refinement. With proper care, these speakers can deliver decades more of listening pleasure.