The bandpass subwoofer box has improved efficiency over bass reflex, but the 4th order bandpass box design has low tolerance for error.
![[PLAN]Bose Panaray 502B Passive 12 Subwoofer Modified](https://i.pinimg.com/originals/ac/37/d7/ac37d7c7c5db497c232d3bf03db663df.jpg)
