The best replacement for 6x9 is 6.5.

The best alternatives to 6x9 are rated as following:
★★★★★  6.5
★★★  6 1 2
★★  subwoofer
★★  6.5 speakers
★★  6x8
★  6.5 component
★  6x7
★  5x7
★  6 1/2
★  4x5
★  component speaker
★  component speakers
★  5.25
★  6.5 better
★  6.5 speaker
★  components
  6x8 speakers
  5x7 speakers
  7 x 10
  6 3 4
  7x10
  6 1 2 speakers
  splits
  61/2
  6 3/4
  5 1/4
  8 sub
  subs
  pioneer 6x9
  7x10 speakers
  61 2

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6x9
6.5
6 1 2