The X-30 and M&K LFE-4 are active line level crossovers intended to be placed between a preamp and amp. I'm not sure what you mean by "freeing up an output."
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I did some looking and found some info on the LFE-1. It stated it is probably equivalent to the current BMC Mini (which I use in my office system). If so, then it will handle two subs. Note that it's a multichannel crossover, but that's no big deal - only use left and right channels.
I can no longer find the manuals for the Paradigm subwoofer control units since the Paradigm web site has changed. So, I don't know if the X-20 will handle two subs.
I don't think you'd have any problems with the M&K BMC, other than service if needed since they are gone.
Would you explain exactly what configuration you hope to come up with? I'm not following the "second amd and speakers".
Typically, you wire a BMC as such: preamp out (left and right) go to BMC in (left and right); BMC sub out(s) go to sub(s) and BMC out (left and right) go to amp in (left and right).
I ended up getting a X-20 yesterday.(guy told me it would work 2 subs)Should come tomorrow.And I got the LFE-1 today.Total investment is like 130 or so.I'll try them both,but most likely stay with the m&k.Prolly put the other in my wifes system.Then everyones happy.Judgeing by pics,the M&K is alot better looking unit.