Bang & Olufsen Synchrobox 4001

Bang & Olufsen Synchrobox 4001 – Vintage Audio Synchronization Device

The Bang & Olufsen Synchrobox 4001 is a rare and highly collectible vintage accessory designed to synchronize audio playback with slide projectors. Developed in the 1960s, this unit represents an early and innovative solution for creating fully synchronized audiovisual presentations.

Using a signal detection system, the Synchrobox identifies synchronization tones recorded on tape and automatically triggers a connected slide projector. This allows seamless transitions between slides, perfectly timed with the audio.

Ideal for collectors, restorers, and vintage Bang & Olufsen enthusiasts, the Synchrobox 4001 is both a functional device and a unique piece of B&O history.

Key Features – B&O Synchrobox 4001

• Original Bang & Olufsen vintage accessory

• Synchronizes tape audio with slide projection

• Automatic slide change trigger via audio signal

• Built with transistor-based electronics (5 transistors)

• Compact and durable metal housing

• Manual test button and sensitivity adjustment

• Designed for use with Beocord tape recorders

How the Synchrobox Works

The B&O Synchrobox 4001 detects specific tones recorded on a tape. When a tone is detected, the unit sends an electrical impulse to a connected slide projector, advancing the slide automatically.

This system was widely used for:

• Educational presentations

• Business demonstrations

• Audio-guided photo slideshows

Why Buy the B&O Synchrobox 4001?

The Bang & Olufsen Synchrobox 4001 is a rare example of early multimedia technology. It reflects B&O’s forward-thinking design and engineering, long before digital synchronization existed.

Perfect for:

• Bang & Olufsen collectors

• Vintage audio enthusiasts

• Restoration projects

• Display or functional use