The LRS+ is not an easy speaker to drive. My GAN amps were the best Class D amps I tried on the LRS+. However, those GAN amps had varying degrees of success. I found the most powerful GAN amp I tried brought my LRS+ to life. That would be the PeachTree GAN400. The PeachTree GAN1 and the LSA Voyager 350 are not as strong as the GAN400 (both were modded). The issue with the GAN400 is that it suffers from not having the utmost resolution, and it is a bit hard on top. The other 2 GAN amps did not suffer on top.
I also found that high current is what the LRS+ likes. My CODA #16 at 150 watts @ 8 Ohm is more powerful current wise than the Sandes. The Sanders Magtech has 500 watts. @ 8 Ohm. I use the Sanders on the LRS+ because it is almost as good as the #16 which is great for a $1000 speaker.
The difference between the 2 amps is a bit more sweetness and more thumping bass from the CODA. The #16 is mostly Class A and the Sanders is Class AB.
The Sanders is a great amp for the LRS+, though not my preferred amp for my other speakers (strange).
Two other amps that I owned that I think would be nice on the LRS+ is the KRELL DUO 175XD (very sweet and smooth Class A) and the Parasound A21+ (not as refined but powerful).