The best replacement for kicker is alpine.

The best alternatives to kicker are rated as following:
★★★★★  alpine
★★★★★  jl audio
★★★★  rockford fosgate
★★★★  mtx
★★★  jl
★★★  pioneer
★★★  rockford
★★★  kenwood
★★★  memphis
★★  polk
★  infinity
★  rockford fosgate subs
★  alpine speakers
★  pioneer speakers
★  alpine subs
★  sony xplod
★  audiobahn
★  punch
  college fund
  jbl
  alpine amps
  punter
  dd
  polk audio
  jl audio subwoofers
  fosgate
  orion
  sundown
  fi
  hifonics
  stretcher
  power stretcher
  pioneer subs
  subwoofer
  cerwin vega
  mtx subs

Your alternative for kicker is not listed? Suggest!
Speaking about kicker, one probably shouldn't forget about half a foot.

Other search terms related to kicker and their ratings are:
★★★★★ half a foot
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Google Trends

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kicker
alpine
jl audio