The best replacement for speakers is headphones.

The best alternatives to speakers are rated as following:
★★★★★  headphones
★★  3 way speakers
★★  monitors
★★  receiver
★  component speakers
★  8 ohm speakers
★  studio monitors
★  2 way speakers
★  amp
★  sound bar
★  sound card
★  subwoofers
★  subs
★  passive
★  headphones gaming
★  speakers
★  3 way
★  passive speakers
★  room size
★  amp more important
★  headphones audiophile
  soundbar
  home speakers
  subwoofer
  full range speakers
  bose
  coaxial speakers
  realtek digital output
  coaxial
  non powered
  receiver more important
  components
  headset
  home theater
  bose 901 reflecting speakers
  active speakers
  8 speakers
  4 ohm speakers
  three way speakers
  amplifier
  wired speakers
  headset gaming
  bookshelf
  articulated array speakers
  car speakers
  microphone
  ceiling speakers
  jbl
  10 speakers
  floorstanding
  wall speakers
  on wall speakers
  wired
  non powered speakers
  amplifiers

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

Other search terms related to speakers and their ratings are:
★★★★★ subwoofer
★★★ amp
★★★ receiver
★★ amplifier
★★ lights
★ boxes
★ built in amp
★ cabinets
★ bass
★ enclosures
★ headphone jack
★ radio
★ hdmi input
★ fm
microphone
dock station
ipod dock
woofer
You have in mind a companion for speakers and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of speakers in all years. Click on graph for more.
speakers
headphones
3 way speakers