Average| Source | Info |
|---|---|
| Stereophile | Stereophile: Oct 2002, vol 25, iss 10, Bolin |
| Stereophile | https://stereophile.com/solidpoweramps/683 |
| Stereophile | Stereophile: Feb 2006, vol 29, iss 2, Damkroger |
| Ultra Audio | https://www.ultraaudio.com/equipment/halcro_dm58.htm |
| Stereophile | Stereophile: Apr 2003, vol 26, iss 4, Bolin |
| Absolute Sound | Absolute Sound: Feb 2001, vol 20, iss 128, Sweeney |
| SoundStage | https://www.soundstage.com/ultraaudio/ultra200206.htm |