The best replacement for 4 channel is 2 channel amp.

The best alternatives to 4 channel are rated as following:
★★★★★  2 channel amp
★★★★★  5 channel amp
★★★★  6 channel rc helicopter
★★  2 channel mixer
★★  2 channel amplifier
★★  8 channel
★★  mono amp
★★  6 channel amp
★★  2 channel
★  3 channel helicopter
★  6 channel
★  3 channel rc helicopter
  5 channel
  2 channel amps
  6 channel heli
  monoblock
  3 channel
  5 channel amplifier
  3 channel rc plane

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4 channel
2 channel amp
5 channel amp