Keene Electronics Stereo Audio Over CAT5 CAT6 Cable Extender 100m 3.5mm Jack No Power Required Black (per Pair) C5AUDIO

Plugged one end into the PC, added a 75m cat 6 cable and added the other unit to the other end of the cable and connected to the input of a small speaker system and it worked first time with no noticeable change in sound quality. Also use these to extend a headphone amp from an audio desk to a commentary position on jobs we do as pro broadcasters and live sports streaming. Fantastic bit of kit for the money

VERY GOOD