Most HT receivers have bass management of some kind. For most low/mid-fi receivers that I've played with, the cutoff frequency was fixed by the receiver at 80 or 100hz. If you have your receiver setup set to SUB=yes/on, it is likely that the receiver is "fixing" the low pass filter for the sub/LFE out port.
If this is true, changing the cutoff frequency at the sub will have no affect. Most manufacturers suggest setting the sub cutoff freq. to max. in this configuration. Since the receiver is controlling the cutoff, there is no reason to set it at the sub. Just set it to max (125hz?) and forget about it.
TIC
If this is true, changing the cutoff frequency at the sub will have no affect. Most manufacturers suggest setting the sub cutoff freq. to max. in this configuration. Since the receiver is controlling the cutoff, there is no reason to set it at the sub. Just set it to max (125hz?) and forget about it.
TIC