The best replacement for rx6 is roxylean.

The best alternatives to rx6 are rated as following:
★★★★★  roxylean
★★★★  cm8
★★★  silver 6
★★★  684
★★★  bx6
★★  gx100
★★  rx2
★★  bx5
★  rs6
★  mezzo 6
★  monitor audio rs6
★  gx50
★  q500
★  b&w 684
★  psb image t6
★  kef q900
  rx5
  tannoy dc6t

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Speaking about rx6, one probably shouldn't forget about roxylean.

Other search terms related to rx6 and their ratings are:
★★★★★ roxylean
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