The best replacement for 685 is cm1.

The best alternatives to 685 are rated as following:
★★★★★  cm1
★★★★★  686
★★★  cm5
★★★  684
★★★  q300
★★  bx2
★★  rx2
★★  683
★  pm1
★  kef q300
★  690
★  689
★  70 686
★  602
★  601
  monitor audio rx1
  cx 680
  monitor audio bx2
  ocx 685i
  rs1
  monitor audio rs1
  kef iq3
  mx 680
  805
  cx 685i
  601 s3
  paradigm monitor

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Speaking about 685, one probably shouldn't forget about marantz pm6004.

Other search terms related to 685 and their ratings are:
★★★★★ marantz pm6004
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685
cm1
686