The best replacement for microphone is line in.

The best alternatives to microphone are rated as following:
★★★★★  line in
★★★★  headset
★★★★  mic
★★★★  line level
★★★  speaker
★★  condenser
★★  dynamic microphone
★★  mike
★★  analog
★★  dynamic
★  condenser microphone
★  megaphone
★  pressure transducer
★  vhf microphone
  active microphone
  headphone
  line input
  omnidirectional
  wired microphone
  regular microphone
  uhf microphone
  speakers
  unbalanced

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

Other search terms related to microphone and their ratings are:
★★★★★ amplifier
★★★ speaker
★★★ speakers
★★ headset
★★ amp
★ pop filter
★ background noise
★ feedback
★ phantom power
★ sound card
★ speaker system
headphones
stand and speaker
voice changer
recorder
stand karaoke
earphones
microphone
recording
You have in mind a companion for microphone and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of microphone in all years. Click on graph for more.
microphone
line in
headset