This subwoofer features the highly efficient BASH® amplifier technology, which combines the musical quality of class A/B amplifiers with the efficiency of class D amplifiers. BASH® technology translates into more efficient, yet more powerful amplification without the heat associated with conventional amplifiers. 

This subwoofer also feature a convenient on/auto/off switch and built-in limiter, which means that sound reproduction will always be clean and as well defined as intended.

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

A limiter prevents high input signals from overloading the subwoofer amplifier. It guarantees that the subwoofer will always be fully in control and that the sound will remain clean and clear, no matter how hard the subwoofer is driven.
 

Slotted port cabinet construction allows for deeper tuning, superior power handling and distinct sonic fidelity. Last but not least, the integrated port design ensures great rigidity and stability in the cabinet design.
 

This subwoofer features speaker-level inputs, which is vital if your amplifier/receiver lacks a subwoofer line output.
 
The subwoofers also have both left and right line-level inputs (for stereo sources) plus a "loop-through" capability to allow the signal to be routed through to a second subwoofer.