Just read this short article on Bass Management: http://www.hometheaterhifi.com/techn...he-slopes.html
HSU Research pretty adamantly prescribes using 80Hz (THX) as the crossover freq. between their speakers and subwoofers. After reading the above article, I was wondering if the 80Hz crossover is prescribed because you (HSU) have purposefully designed your speakers to work properly (roll-off) with the general 2nd order slope built into receiver bass management crossovers?
FYI, I happen to use a HSU Enthusiast 2 system (VTF2mk3) with an Onkyo tx-sr805 crossovers set to 80Hz.