am I reading this correctly that you have a 4.1 setup (i.e. no C speaker)? do you run your mains full range or do you want them bass managed and routed to your mono sub channel?
if so then I suggest you use 5.1 in a 7.1 container output format with the "move centre to front L/R" option checked as this distribute the C across the LR so you don't lose that content. You may also want the 1st option to avoid upmixing stereo to multichannel.
This will give you full range signals on channels 1 and 2 (L and R), LFE on channel 4 and full range surround signals on channels 7 and 8 (SL and SR). Channels 3,5,6 will be empty and free for you to use as you like.
You could then copy channels 1 and 2 to 5 and 6 and hence use 1/2/5/6 for your 2 way active LR.
If you want to use your suggested approach (of 5-6 for surround and 7-8 for LFE) then you would need to;
- move SL to RL (7 to 5)
- move SR to RR (8 to 6)
(you now effectively have L=1, R=2, LFE=4, SL=5, SR=6, 3/7/8=empty)
- move SW to SL (4 to 7)
- copy SL to SR (7 to
(you now effectively have L=1, R=2, LFE=7/8, SL=5, SR=6, 3/4=empty)
- copy L to C (1 to 3)
- copy R to SW (2 to 4)
(you now effectively have L=1/3, R=2/4, LFE=7/8, SL=5, SR=6)
note that you can't rename channels in jriver so you have to remember the mapping
you would now apply low passes to C and SW (3 and 4) and high passes to L and R (1 and 2) to give you your active front pair
If you want to do bass management as well then you have 3 choices;
1) use the convolver to do bass management on the above setup
2) switch to a >8 channel output format (to give yourself free channels to play with) and deal with mixing down 7.1 to 5.1 yourself
3) use jriver room correction and place that *before* the PEQ block that is handling the above
option 3 is probably simplest
option 1 is arguably the most work but is trivial extra work if you are applying phase correcting filters)
option 2 is not much harder than option 3 but does make your PEQ block more complicated
personally I wouldn't bother doing to moving channels around in jriver, I'd keep it simple and use your lynx mixer for that
remember you'll need to set delays at some point as well