The amount of force and air motion produced by a typical bass driver can be considerable particularly depending upon various listener preferences, musical material and of course the audio system configuration itself. Needless to say, the cannon fire in Tchaikovsky's 1812 overture for instance—combined with a moderate to high volume setting—can create a very dramatic result.
When a strong bass signal reaches the woofer in a traditional box enclosure, it causes the box to vibrate as the woofer moves. This is a result of an equal and opposite reaction to the woofer's cone movement. You can feel it by touching the speaker cabinet. Although acoustics theory tells us that the speaker can actually move in the listening room, the fact that speaker enclosures are usually much heavier than the woofer, keep any such motion to a minimum.
However there is one other by-product that audiophiles are very aware of—muddy bass. The vibrations which are translated from the woofer to the cabinet can actually dampen the bass signal causing a loose and even fuzzy sound.
A typical woofer in a box will cause the box to vibrate when the woofers cone moves. This is caused by the equal and opposite reaction to the cone moving. For instance when the cone moves forward it pushes against the magnetic field in the gap of the driver. This force is then translated to the driver and through its frame to the speaker box as a whole. The force against the box is the same as the force required to accelerate the cone Force = mass x Acceleration. Since the box is much heavier than the driver, it does not move very far. However the vibrations caused by its movement can be felt by hand on the outside of the box. Many people believe this phenomenon leads to muddy bass. To counteract the vibration typically the box is made of extremely heavy material.
BalancedForce uses two or more drivers mounted facing away from each other. They are mechanically positioned so that their center lines all cross at a point with equal angles between each other. For instance two drivers would have their centerlines meet half way between them and each line would be at 180 degrees from the other. When the cones on the drivers move an equal and opposite force is generated and translated to the cabinet. However the other drivers in the system do the same thing as well. Because of the driver positioning all of the forces cancel in the cabinet. Since the forces cancel the box holding the drivers does not move.