The distinguishing feature of the Semiaktiv-Series is the use of active amplification in the bass range in combination with an electronic frequency crossover.
A refined integrated controller continuously analyzes the membrane movements of the bass chassis, essentially creating a unit with it, and compares the real with the ideal signal movement, which leads to a continuously new, fine-tuned vibration. In contrast to systems adjusted using accelerometers, this occurs in real time and can be compensated for self-resonance as well as for room influences such as waves affecting the membrane, which under other (uncontrolled) circumstances would unavoidably lead to annoyingly exaggerated bass tones. The result is a very deep, powerful, and always exceptionally crisp bass response.This way, the amplifiers can focus on reproducing your music as accurately and transparently as possible, while the integrated amplifiers for each of the bass drivers take on the mighty task of reproducing the bottom end.
The passive part of the loudspeaker does not feature any phase-shifting high-pass filters, meaning that only the external amplifier shapes the sound – without any capacitors interfering with the signal path. The bass unit receives the amplifier output without any electrical interference, ensuring that the music signal is not distorted in any way.