The best replacement for crossover is parallels.

The best alternatives to crossover are rated as following:
★★★★★  parallels
★★★★★  suv
★★★  wine
★★★  straight through
★★★  patch cable
★★  minivan
★★  equalizer
★  sedan
★  patch
★  straight
★  straight through cable
★  qnix
★  crossover
  rollover
  bootcamp
  wagon
  straight ethernet
  winebottler
  yamakasi
  straight cable
  wine mac
  car
  amp crossover
  patch ethernet cable
  patch difference
  wineskin
  rollover cable
  mutation
  cedega
  small suv
  straight through cables
  no crossover
  hatchback
  crossover games
  cross over
  vmware fusion
  passive crossover

Your alternative for crossover is not listed? Suggest!
Speaking about crossover, one probably shouldn't forget about amp.

Other search terms related to crossover and their ratings are:
★★★★★ amp
★★★ subwoofer
amplifier
You have in mind a companion for crossover and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of crossover in all years. Click on graph for more.
crossover
parallels
suv