By Wilde Becker. Speaker Stands. At Tuesday, July 30th 2019, 19:08:11 PM.
That’s where you need to put the sub. If your sub has a phase adjustment knob, or a polarity–invert switch, adjust this until you hear the loudest result from frequencies around the crossover point, typically 80 to 120 Hz.
We tend to think of a loudspeaker as a fixed box that produces sound directly from the moving cones of the speakers (and, where the speaker is ported, from the port as well). Although that is certainly where most of the sound comes from, the reality is that no matter how rigid the cabinet is there will also be some vibration of the cabinet walls.
Whether you use stands or platforms depends on what else you have in your system: usually you’ll pick whichever makes it easiest to get your speakers into the right physical position without them being occluded by other equipment, such as computer screens.