The best replacement for qsc is crown.

The best alternatives to qsc are rated as following:
★★★★★  crown
★★★  jbl
★★★  mackie
★★  behringer
★★  ev
★★  crest
★★  yorkville
★  rcf
★  cerwin vega
★  jbl prx
★  eaw
★  peavey
★  cvtech
★  crown amp
  yamaha speakers
  yamaha dsr
  carvin
  crown amps
  ev speakers

Your alternative for qsc is not listed? Suggest!
Speaking about qsc, one probably shouldn't forget about axe fx.

Other search terms related to qsc and their ratings are:
★★★★★ axe fx
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Google Trends

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qsc
crown
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