sentences:  Complementary methods to use in combination with porous absorption include drywall/stud construction of walls/ceiling and filled with insulation as a form of highly damped resonant bass trapping using the drywall itself as the membrane.The combination of inherently lossy resonant room boundaries and paper or foil faced porous bass trap absorption deep in the tricorners (where three room boundaries meet) is often sufficient to attain acceptable bass response even in listening rooms with somewhat problematic resonances.Adjusting the listening position within the room boundaries and elevating the seating with a riser that is filled with porous absorption is one more method that can improve bass response without resorting to resonant bass trapping, while simultaneously improving home theater screen visibility.