Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
Multiple subs are the only way to go in my opinion. It's done more to smooth out room modes than to increase SPL. The idea is to place them around the room in different places so self-interference that is destructive from one sub is filled in by another sub. The different distances between each sub and each room boundary is what does it.