Reaction Cancelling Ports

It is not usually appreciated that the air rushing in and out of the port in a vented loudspeaker also results in a small reaction force on the cabinet in the same way as a rocket moves in the opposite direction to that of the exhaust gases.

A consequence of this is that the quality factor of the port resonance is affected by the mounting of the enclosure with respect to the ground. A good coupling, through spikes for example, or a complete decoupling on rubber mounts both result in a higher "Q" than when the enclosure is just resting on a carpet. All this vaguery can be eliminated by the simple act of using two opposing ports to cancel the cabinet reaction completely.

Vivid Audio Reaction Cancelling Ports

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