Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
Yes, I expect self-interference and room modes are likely the problem. I use the three π subs, which have a LAB12 woofer in them. But you can use a smaller sub, perhaps one that doesn't give as much extension, if you're worried about bothering the neighbors. The idea is to blend them to provide modal smoothing.