B-4.Cis – Patented Cardioid Technology

The B-4.C13 is a state-of-the-art column loudspeaker based on a unique principle. Our Patent is based on the foundations of cardioid technology, delivering perfect three-dimensional directivity over a wide frequency range. The extremely low risk of feedback allows a wide range of possibilities regarding microphone use. The frequency spectrum is perfectly managed by the integrated 4-way crossover, achieving a frequency-constant vertical coverage angle. Contrary to standard solutions a distinctive attenuation towards sides and rear is already achieved at low and midrange frequencies. The excellent reproduction quality for speech and music is sustained over long distances and delivers excellent results even in acoustically problematic rooms like churches or halls. The B-4.C13 is fitted with eight long-excursion 4“ cone chassis and a 1“ HF-driver. The upper two cone chassis with the HF unit placed in the middle between them form a D‘Appolito array. The six additional 4“ drivers are placed below them and form the line structure. The standard enclosure is made from high-quality aluminium and is optionally available in several surface structures and colour-matched metal front grilles. No mounting elements can be seen on the front grille and the side panels.


Sound for churches.
Conference rooms.
Meeting rooms and class rooms.
Tradefair exhibitions.
Sports halls.
Public buildings.

Options and Accessories

100 V transformer.
Special coatings in RAL colour.
Special version without integrated
passive crossover for electronic tilting.
Mounting hardware MUB-0.30 and MUX-0.30.
Weatherproof version for outdoor use.
Available with circular baseplate as elegant column for variable use.

Technical Data

Data B-4.Cis