Matt,
One line of thinking is that subs can relieve mains and the amps that drive them from extreme LF duty. Subs can also help smooth LF response in room. THX recommends a crossover of 80 Hz, a frequency low enough that its source should not be localized. Whatever the setting, the goal is to not have any speaker identified as a source of sound within the sound stage. You do not want to be aware of the subs.
The frequency response of a speaker usually is measured in some sort of anechoic environment. (Rooms with deep anechoic ability are expensive to build.) The 3 dB down point often is used as an indicator of the useful frequency range of the speaker, but its actual response will be a function of your room.
db
One line of thinking is that subs can relieve mains and the amps that drive them from extreme LF duty. Subs can also help smooth LF response in room. THX recommends a crossover of 80 Hz, a frequency low enough that its source should not be localized. Whatever the setting, the goal is to not have any speaker identified as a source of sound within the sound stage. You do not want to be aware of the subs.
The frequency response of a speaker usually is measured in some sort of anechoic environment. (Rooms with deep anechoic ability are expensive to build.) The 3 dB down point often is used as an indicator of the useful frequency range of the speaker, but its actual response will be a function of your room.
db