First system with the LRS was a Conrad Johnson PV10B with Muse 150 monoblocks. The bass was lacking, I added two REL T5i and was satisfied. Easy to blend in spite of all the nonsense about how "hard it is" to do that. Placed the subs directly behind along a side wall with the speakers about 3 ft off the wall and toed in with tweets outside.
Second system with Bryston BP20 and MPS-1 and 4BSST. No subs used. Placement in a big room used an alcove to create two corners. Bass satisfying enough. OK it's not 100% integration with the subs but close enough. Use your room if you can.
Bottom line just buy Bryston IMHO although the tube preamp was sweet with them.