Run your RCA lines from your preamp as you suggested in option #1.
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I"d insert an active x-over in the loop. I use NHT, which is versatile, undetectable (to my ear) in the main path, and relatively inexpensive. This does put another component in the signal path, but (as noted) I find it benign and the seamless hand-off you achieve will be well worth your effort, IME and IMO.
If you really want to see what's possible in this type of set-up, slip an SVS/Audyssey or Velodyne room correcting sub equalizer between the active x-over and the Descents (it will EQ the subs only, and be out of the main path, entirely). I use the Velo SMS-1 (again, relatively inexpensive), but some swear by the SVS unit.
IMO, this was the single biggest audible improvement I have made to my system in the last 20 years.
As always, YMMV, but the SVS, Velo, and NHT units are sold direct with money back in-home terms. If you M does, in fact, V from mine, you can ship it all back at little to no cost.
another comment unrelated to the hook up method. Have you ever tried running the subs at different locations? I was at a friends house, he was running ML CLS mains and had two subs. One sub was in one of the front corners of the room. The second sub was placed all the way in the back of the room - middle/center. The depth of the sound stage was amazing. If your cables are long enough, give it a shot and see what you think.
Scousepasty, so to understand you... you feed from the high voltage speaker terminal to the low voltage RCAs on the subs? Or do you mean you run RCAs to the amp and you Y off them to the RCAs on the subs? Or...from the high voltage speakers post you run to the speaker level in on the subs...
At the moment, I run them like the the last option via high voltage but thought it would be just as well to run RCA from the preamp.
I have dual NHT subs, and related NHT SS dual amps. I have three systems, each with separate pre amps. One has dual amps outs, one a sub out, and one with only tape outs. I route all of the outs to a Chase RLC remote controlled unit as a switcher that goes to each of the NHT amps. I do not use the NHT amps to feed the three different sets of speakers that I use individually, all driven by tube amps. Since the line out of each pre amp is different, the Chase unit's remote is used to adjust the output of the NHT sub amps. Works well, gives a lot of flexibility. For WAF purposes, each sub is in a front of the room corner, but I have been testing various other placements. Nothing finalized yet.