Average| Source | Info |
|---|---|
| Stereophile | Stereophile: Feb 2005, vol 28, iss 2, Phillips |
| Stereophile | https://stereophile.com/integratedamps/205krell |
| Audiofile AV | https://sites.thestar.com.my/audio/story.asp?file=/2007/5/31/audiofile/31krell |
| Stereo Times | https://stereotimes.com/amp071604.shtml |
| SoundStage | https://www.soundstage.com/revequip/krell_kav400xi.htm |
| Superior Audio | https://www.enjoythemusic.com/superioraudio/equipment/0104/krellkav400xi.htm |
| Absolute Sound | Absolute Sound: Apr 2004, iss 147, Garcia |