Bang & Olufsen BeoLufsen 901 (1978)
The Bang & Olufsen BeoLufsen 901 came out in 1978. It belongs to B&O's 900 series and is a pair of passive speakers designed by Jacob Jensen. The look is minimalist and functional, and the acoustics were advanced for the era.
Specifications
| Feature | Specification |
| Year of Production | 1978–1982 |
| Type | Passive, 2-way modular column speakers |
| Impedance | 4 ohms |
| Power Handling | Not specified (passive design) |
| Sensitivity | Unknown |
| Frequency Response | Not officially documented |
| Tweeter | Acoustic lens tweeter for wide dispersion |
| Woofer | Mid-bass driver with foam surround |
| Enclosure Material | Beech wood finish with aluminum elements |
| Dimensions (H×W×D) | 105 cm × 20 cm × 20 cm (each column) |
| Weight | Approx. 18 kg per pair |
| Design | Modular: separate woofer and tweeter columns |
Design and Key Features
The BeoLufsen 901 uses a modular column design, with separate vertical units for the woofer and tweeter sections. The split was meant to improve sound staging and reduce inter-driver interference. The most distinctive part is the acoustic lens tweeter, a B&O development that gives very wide, even high-frequency dispersion. That means a more immersive sound without the need for precise "sweet spot" positioning.
The finish is beech wood with clean aluminum accents. There are no visible grilles, and the drivers sit flush in the cabinet. That follows Jacob Jensen's philosophy of form following function.
Historical Significance
The 901 is part of the high-end 900 series. During the late 1970s and early 1980s, B&O set itself apart from competitors by putting sonic performance and fit in a living space on equal footing. The 901 shows both: the acoustic lens on the inside and a sculptural look that suits modern interiors.
These speakers were marketed to audiophiles and design-conscious buyers alike. They were often paired with other B&O electronics, such as the BeoCom 904 receiver or BeoLab amplifiers.
Sound Signature
The BeoLufsen 901 has a detailed and transparent sound, especially in the upper frequencies, thanks to the acoustic lens tweeter. Highs are clear and expansive, and dispersion is excellent, so the room fills evenly. The midrange is well-balanced and natural, and suits vocal and acoustic recordings.
The bass can be somewhat light, especially when the speakers are poorly placed or driven by low-powered amplifiers. They are 4-ohm speakers, so they do best with amplifiers that can drive a low impedance stably. Placement near rear walls, or with slight toe-in, is often recommended and can significantly improve bass coupling and overall tonal balance.
Maintenance and Common Issues
The BeoLufsen 901 is durable, but it needs attention to age-related wear:
- Foam Surround Degradation: The woofer drivers use foam surrounds that may deteriorate over time, leading to distorted bass or mechanical rubbing. Re-foaming or full driver reconing is a common restoration step.
- Acoustic Lens Maintenance: The lens mechanism can accumulate dust or lose rotational smoothness. Gentle cleaning with compressed air and isopropyl alcohol on a soft cloth is recommended.
- Connector Oxidation: The speaker binding posts and internal wiring connectors may oxidize, especially in humid environments. Regular inspection and cleaning with contact cleaner can prevent signal loss.
- Wood Finish Care: The beech wood cabinets should be cleaned with a dry or slightly damp cloth. Avoid harsh chemicals to preserve the natural finish.
Restored pairs in excellent condition often command higher prices. Collectors and vintage audio enthusiasts seek them out.
Collectibility and Market Value
The BeoLufsen 901 has a collectibility rating of 7/10, driven by its design, the Jacob Jensen connection, and its place in the 900 series. It is not as rare as some limited-run models, but steady demand continues.
Based on recent market trends, a pair of BeoLufsen 901 speakers typically sells for $300 to $800. Price depends on condition, completeness (including original packaging or documentation), and whether restoration work has been done. Fully serviced units with re-foamed drivers and cleaned lenses tend to sit at the higher end of the range.
Conclusion
The Bang & Olufsen BeoLufsen 901 remains a compelling choice for vintage audio enthusiasts who appreciate the fusion of innovative acoustics and timeless design. While they require care and thoughtful amplification, their unique sound and visual presence make them a standout addition to any classic hi-fi setup. Whether displayed in a modern living room or integrated into a retro audio system, the 901s continue to embody the essence of Danish audio excellence.
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