The best replacement for headphone jack is line out.

The best alternatives to headphone jack are rated as following:
★★★★★  line out
★★  audio out
★  dock connector
  optical audio
  i-phone jack

Your alternative for headphone jack is not listed? Suggest!
Speaking about headphone jack, one probably shouldn't forget about usb.

Other search terms related to headphone jack and their ratings are:
★★★★★ usb
★★★★ usb adapter
★★★ audio red and white
★★ rca cables
★★ usb port
headphone jack
clock radio
You have in mind a companion for headphone jack and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of headphone jack in all years. Click on graph for more.
headphone jack
line out
audio out