When we choose the placement position of the subwoofer, what should we pay attention to?

Place the subwoofer and place the left and right channel speakers, pay attention to the position, because the subwoofer will also be affected by the reflection of the adjacent wall or floor, and the enhancement will occur at some frequencies (positive phase). The effect also produces offset (inverse phase) effects at certain frequencies. In addition, the low-frequency or low-frequency standing waves that are inevitable in the listening space also affect the performance of the subwoofer. So, when you choose the position of the subwoofer, the first thing to consider is: Do I need to increase the volume of the subwoofer by the low frequency enhancement of the corner. The second thing to consider is whether the standing wave (caused by the left and right channel speakers) that originally existed in the listening space will form an enhancement (positive phase) or offset (inverse phase) with the sound wave of the subwoofer. To put it more clearly, when we are placing the subwoofer, we must not only consider the opposite phase of the sound waves between the subwoofer and the left and right channel speakers, but also consider the subwoofer itself and the phase. The opposite phase problem caused by the adjacent floor and wall. The positive phase and reverse phase problems caused between the subwoofer and the left and right channel speakers can be solved by the phase adjustment device attached to the subwoofer. As for the positive phase and reverse phase problems caused by the subwoofer itself and the wall, how to deal with it? Of course, it can only be handled by the position of the subwoofer. Seeing this, I think readers have come to realize that the seemingly simple subwoofer placement involves such complicated considerations.