Wayne Parham Messages: 18755 Registered: January 2001
Illuminati (33rd Degree)
Use two to four subs in different places in the room for best sound quality. In some rooms, two is enough, especially if the mains provide adequate bass too. The idea is to spread the sound sources around, to smooth room modes. You want multiple sound sources in the modal range, below about 150Hz. So if your mains don't provide much bass, go with three or four subs. You can go with more than four subs, but the concept of diminishing returns applies here.