Published at Wednesday, July 31st 2019, 07:41:33 AM. Speaker Stands. By Cort Friedrich.
And stands do more than combatting early reflections. They also provide what’s called decoupling between your speakers and the floor (which is also known as mechanical isolation). We will let Otto describe their construction: “Take your typical Dynaudio Stand; you have feet with either spikes for solid floors or rubber for wooden ones at the bottom. Then you have a base plate that manages vibrations. Also, large base plates with feet far apart are more stable, making it harder for the speakers to fall over.
An isolation platform works in a similar way to a car’s suspension, and comprises three mechanical components: a spring, a mass supported by the spring, and some form of damping to prevent the sprung mass from continuing to bounce around. In a car you have the springs between the axles and the car body: the car body provides the mass and the shock absorbers provide the damping, to stop you having a bouncy ride.
The theory is that the mass and spring characteristics are chosen so that the resonant frequency of the combination is well below that of any frequency they’re likely to be asked to isolate. For example, if the lowest note a speaker can reproduce is 30Hz, then the resonant frequency of the supporting platform needs to be well below that — perhaps just a few Hertz or less.
It’s physics: for every action, there’s an equal and opposite reaction.