Bang & Olufsen 700 Speakers (1975)

The Bang & Olufsen 700 is a classic pair of passive loudspeakers introduced in the mid-1970s as part of the Danish manufacturer's commitment to combining high-fidelity audio performance with minimalist, elegant design. Designed to integrate seamlessly with other Bang & Olufsen audio components of the era, the 700 model exemplifies the brand's philosophy of form meeting function.

Specifications

Feature	Specification
Model	Bang & Olufsen 700
Year of Release	1975
Type	Passive 2-way bookshelf speakers
Driver Configuration	2-way: woofer + tweeter with acoustic lens
Tweeter	Dome tweeter with patented acoustic lens
Woofer	Mid-bass driver with foam surround
Impedance	4–8 ohms (compatible with most B&O amplifiers)
Sensitivity	Not officially documented
Power Handling	Passive – requires external amplifier
Crossover	Internal passive crossover network
Cabinet Material	Solid beech wood with natural finish
Dimensions (per unit)	Approx. 30 cm H × 18 cm W × 15 cm D
Weight	~4.5 kg per speaker
Color Options	Natural beech, dark-stained wood variants
Designed For	Integration with B&O Beovox and Beolab systems

Design and Key Features

The Bang & Olufsen 700 stands out for its clean Scandinavian design language. The cabinet is crafted from solid beech wood, giving it both durability and a warm aesthetic that complements mid-century interiors. The most distinctive feature is the acoustic lens tweeter, a technology developed by B&O to disperse high frequencies more evenly across the listening space, reducing "beaming" and creating a wider sweet spot.

This 2-way speaker system was engineered for use within Bang & Olufsen’s ecosystem, particularly with their Beovox amplifiers and turntables. Its impedance range of 4–8 ohms ensures compatibility with most B&O receivers of the period, which were designed to work optimally with their proprietary speakers.

Sound Signature

The 700 delivers a balanced and refined sound characteristic of Bang & Olufsen’s engineering ethos. The acoustic lens enhances clarity in the high frequencies, providing crisp yet non-fatiguing treble. The midrange is smooth, ideal for vocal and acoustic music, while the bass response—though modest due to the compact cabinet—is well-controlled and articulate.

These speakers perform best in small to medium-sized rooms and shine when paired with matching vintage B&O electronics, preserving the intended sonic synergy.

Historical Significance

Introduced during a period of rapid innovation in consumer audio, the Bang & Olufsen 700 reflects the brand’s focus on design integration and system coherence. In the 1970s, B&O distinguished itself from competitors by treating audio systems as holistic experiences—where speakers, amplifiers, and turntables were designed together for optimal performance and visual harmony.

The 700 model was part of a broader family of speakers that emphasized craftsmanship and technical innovation. While not the flagship of its time, it represented accessible luxury and became a staple in European hi-fi setups, particularly in Denmark and Germany.

Collectibility and Market Value

With a collectibility rating of 6/10, the Bang & Olufsen 700 appeals primarily to vintage audio enthusiasts and B&O collectors. Their value lies more in their design heritage and brand prestige than in raw performance by modern standards.

Market Value: $100–$300 per pair, depending on condition
Factors Affecting Value: Original finish, working condition, presence of foam degradation, and completeness (grilles, mounting hardware)

Well-maintained pairs with original components command higher prices, especially in Scandinavia and Western Europe.

Maintenance and Restoration Tips

Owning vintage speakers like the Bang & Olufsen 700 requires attention to aging components:

Common Issues:

Degraded Foam Surrounds: Common in speakers from this era. Foam can disintegrate after 40+ years, leading to distorted bass or complete driver failure.
Aging Crossover Capacitors: May dry out or leak, affecting sound quality and potentially damaging drivers.
Cabinet Scratches/Wear: Beech wood is durable but susceptible to scratches and discoloration over time.

Recommended Maintenance:

1. Inspect the Woofers: Check for crumbling foam. If found, consider reconing or replacing the drivers.

2. Capacitor Replacement: Have the crossover network inspected and recapped by a qualified technician to restore clarity and protect the tweeters.

3. Cleaning: Use a soft, dry cloth for the cabinet. For deeper cleaning, use a wood-safe polish suitable for natural finishes—avoid silicone-based products.

4. Proper Placement: Position away from direct sunlight and humidity to preserve wood and internal components.

5. Use with Appropriate Amplifiers: Pair with low-to-mid powered tube or solid-state amps, especially B&O-branded models for authentic sound.

Conclusion

The Bang & Olufsen 700 is more than just a vintage speaker—it's a piece of audio design history. With its elegant wood cabinet, innovative acoustic lens, and integration-focused engineering, it remains a desirable addition to any retro hi-fi setup. While it requires care and occasional restoration, its timeless design and signature B&O sound continue to captivate audiophiles and collectors alike.