Average| Source | Info |
|---|---|
| TNT Audio | https://www.tnt-audio.com/casse/quad-esl989-2_e.html |
| Absolute Sound | Absolute Sound: Oct 2000, vol 20, iss 126, Seydor |
| Stereophile | Stereophile: May 2003, vol 26, iss 5, Dudley |
| Audio Ideas Guide | https://www.audio-ideas.com/reviews/loudspeakers/quad989.html |
| TNT Audio | https://www.tnt-audio.com/casse/quad-esl989_e.html |
| Stereo Times | https://stereotimes.com/speak091702.shtml |
| Stereophile | https://stereophile.com/floorloudspeakers/720 |
| Stereophile | Stereophile: Nov 2002, vol 25, iss 11, Greenhill |