Beolab 4000 Designer Active Speaker with Stands

The BeoLab 4000 is one of Bang & Olufsen’s most iconic compact active loudspeakers, designed to combine architectural aesthetics with intelligent acoustic engineering. Introduced as a flexible lifestyle speaker, it was built to deliver high-quality sound in spaces where traditional large speakers were impractical. Its distinctive aluminium “leaf-shaped” cabinet and integrated amplification made it a pioneering example of design-driven hi-fi that remained technically serious.

Unlike conventional passive speakers, the BeoLab 4000 is a fully active system, meaning amplification, driver tuning, and acoustic optimisation are engineered as a single matched unit.

⚙️ Key Specifications

• Type: Active 2-way bass-reflex loudspeaker

• Drivers:

  • 1 × 114 mm mid-bass driver

  • 1 × 18 mm tweeter

• Built-in Amplification: Dual Class AB amplifier modules (~59W per module)

• Frequency Response: approx. 55 Hz – 20 kHz

• Maximum SPL: approx. 97 dB (pair)

• Crossover Frequency: ~3.3 kHz

• Cabinet Volume: ~4 litres

• Construction: Aluminium enclosure

• Placement Options: Shelf, wall, ceiling, or stand mounting

• Inputs: Power Link + line input

• Design: Magnetically shielded, adaptive bass equalisation (ABL)

🏗 Design & Engineering Philosophy

• Designed as a compact speaker usable anywhere in the home

• Aluminium cabinet improves rigidity and durability

• Non-traditional elliptical form maximises internal volume while maintaining slim aesthetics

• Active amplification ensures optimal driver control and efficiency

• Adaptive bass management protects drivers while extending perceived low frequency output

B&O’s goal was not to build a studio monitor, but a high-performance lifestyle speaker that integrates visually into living spaces without sacrificing clarity.

🎧 Sound Performance

Tonal Balance

• Clean, balanced overall presentation

• Smooth treble with refined character

• Natural midrange suited for vocals and acoustic music

• Bass surprisingly full for cabinet size

Imaging & Presentation

• Wide sound dispersion

• Excellent nearfield listening performance

• Stable stereo image when properly positioned

Dynamics

• Fast transient response due to active amplification

• Plays louder than expected for its size

• Maintains composure at moderate listening levels

Real-World Character

The BeoLab 4000 prioritises clarity and musical comfort rather than aggressive impact. It fills rooms with sound effortlessly, making it ideal for long listening sessions and everyday music enjoyment.