The best replacement for ls50 is r300.

The best alternatives to ls50 are rated as following:
★★★★★  r300
★★★★  x300a
★★★  cm5
★★★  pm1
★★★  r100
★★★  p3esr
★★★  q300
★★  concept 20
★★  gx50
★  ls3/5a
★  harbeth p3esr
★  r500
  b&w cm5
  kef r300
  b&w
  b&w pm1

Your alternative for ls50 is not listed? Suggest!
Speaking about ls50, one probably shouldn't forget about naim unitiqute.

Other search terms related to ls50 and their ratings are:
★★★★★ naim unitiqute
★★ arcam
You have in mind a companion for ls50 and it is not yet here? Propose!



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ls50
r300
x300a