For those who may be using
JRiver's DSP Studio for "simple" home theater PC multi-channel surround setups, I recommend to use the PEQ section for your bass management and
avoid the dedicated "Room Correction" DSP module.
The reasoning behind this and (original templates) are found in this
JRiver thread.
I currently switch between these two templates stored as presets in DSP Studio, and the ff. are simplified examples:
LFE is high-passed above
Stacked x2 Butterworth filters are used to create LR 24/dB octave filters. If you want multiple subs to distribute the sub/LFE, you could use a miniDSP 2x4HD which could also give you max ~2042 taps for each sub(s x2)
if needed -- even that may be enough to make some very general phase curve manipulations.
LFE is extended to satellite(s) below
The signals coming out are essentially the same in both, except for those cases (some concert DVDs) where the LFE signal contains a full frequency range e.g. bass guitar harmonics are routed to the either satellites or a dedicated center channel. I do not have a center channel and there's a ~15dB bass cancellation in my surrounds so that extended bass is routed to the L+R mains.
Now, there may still be potential issues with the LFE + sub-satellite system not summing properly if the individual channel phases are not adequately phase compliant at your microphone's position. JRiver also does not have currently All-Pass filter capabilities in their native PEQ section.
For that I can recommend
rePhase for manually applying
FIR convolution to each channel (will need a
config file for this) to manipulate the phases if necessary -- very much an iterative process, adjusting between flattening the phases and re-adjusting the delays -- REW's dedicated "Alignment Tool" under the "ALL SPL" tab view can be invaluable here. Even "small improvements" can be achieved even if you can't fully linearize the sub-satellite xo due to specific room acoustics issues.
BTW, rePhase is also quite useful for you to visualize some before and after correction graph displays since JRiver does not have this facility in its PEQ window.
PEQs simplifed version
cross-overs overlap, but since phases are all flat, it's a non-issue