The Boundary Gain Compensation filter compensates for the room influence
at low frequencies, as any room amplifies the lowest frequencies. The magnitude of the room’s amplification depends on the room size and where you are positioned in the room. Normally, it increases the closer you get to a wall. This can result in too high a bass level from approx. 60Hz and increasing downwards - in the range between 20-30Hz it peaks up to 5-10dB in an average room!
At first this could sound really impressive, but the sound quickly begins to sound ‘boomy’, especially when listening to music, and rather annoying. So the Boundary Gain Compensation ensures a very linear in-room bass response and gives you more flexibility when it comes to placement and choosing your favourite listening position.

Continuously variable level, phase and cut-off frequency controls make it easy to tune the subwoofer to integrate with virtually any speaker on the market, as well as allowing different placements and personal preferences

When a large woofer has been abruptly driven by a strong sonic impulse such as an explosion or a timpani, the woofer continues moving after the impulse stops.The MFB circuit compares the impulse to be reproduced with the actual movement of the woofer. If the woofer moves unnaturally in relation to the input signal, the MFB circuit corrects the error before it becomes audible. Furthermore, the MFB makes it possible to equalize the subwoofer to go deeper without losing any precision.The result is incredibly accurate, deep bass, full of punch and dynamics.