Average| Source | Info |
|---|---|
| Stereophile | Stereophile: Jan 2001, vol 24, iss 1, Deutsch |
| Stereophile | https://stereophile.com/digitalprocessors/455 |
| Stereo Times | https://stereotimes.com/acc011601.shtml |
| Stereo Times | https://stereotimes.com/acc030201.shtml |
| Stereo Times | https://stereotimes.com/acc040201.shtml |
| Stereo Times | https://stereotimes.com/acc050701.shtml |
| Positive Feedback | https://www.positive-feedback.com/Issue19/perpetualp3a.htm |
| SoundStage | https://www.soundstage.com/revequip/perpetual_p1a_p3a_followup.htm |
| Audio Ideas Guide | https://www.audio-ideas.com/reviews/digital-sources/pertpetual-p1-p3.html |
| onHiFi.com | https://www.onhifi.com/product/perpetualtech_p3a.htm |
| Secrets of HT & HiFi | https://www.hometheaterhifi.com/volume_7_3/perpetual-technologies-p1a-p3a-9-2000.html |
| SoundStage | https://www.soundstage.com/revequip/perpetual_p1a_p3a.htm |