The LRS is a badly flawed speaker. A change of amps will not improve its sound. Go to Audio Science Review and read the test report. Yes, ASR is anathema to folks here but speaker measurements don't lie!
those folks likely measured it incorrectly. It has a forward and back radiating pattern. I just sold my LRS+ since I lost my small room and the LRS+ was the BEST speaker in this space. It may lack a bit of the clarity of the KEF LS50 META (which measures well) but the overall listening experience with the KC62 sub and both speakers led me to favor the LRS+ by a lot.
Amps make a massive difference on the LRS+. The best amp I tried on it was the CODA #16. The second best (now selling) was the Sanders Magtech. The Benchmark AHB2 was too weak even though it has 100 watts. I am talking even at low to moderate volumes. The amp matters a great deal on the LRS+.
I must temper my comment as someone who has owned the LRS+ and various amps that I mentioned. I would go with the infinite wisdom of ASR over anyone who has owned the gear.