StevePNW
100+ Head-Fier
Thanks @tincanear for the insight on the Rag 2 integrated gain stage impressions from Jason's discussions. I wonder what that circuit system actually has as far as gain stages.every gain stage adds noise / distortion, so in the case of Freya S + Vidar, there are at least 5 gain stages: Freya S front end, Freya S driver, Vidar front end, Vidar driver, and Vidar output stage. Ragnarok 2 has only 3 or 4 stages (based on Jason's posts). So theoretically lower overall noise.
If you are intending to drive the Zu (97 dB/1W/1m) or other efficient speakers using a balanced source, pre-amp and dual mono Vidars (effectively running balanced) there might be more gain than you need for max rated amp power, resulting in more background hiss. gain options are 1x or 4x on Freya S, so either 22x or 88x overall. 4x Nexus mode combined with Vidar's gain is likely to overdrive/ clip too easily, so you'll likely need to run in passive (requires true balanced source) or Nexus 1X modes. Rag 2 has the advantage of a mid-gain 8x mode in addition to the 1x and 25x choices.
Using full balanced should help alleviate / reduce potential hum/buzz issues related to ground loops. Never defeat / remove the AC ground prong connections to eliminate ground loop noise as fault conditions could result in electrical shock or fire hazards.
My brother-in-law would not be using Vidars for a Zu speaker set...but I'm enjoying the LS 50 Metas with my Vidars as they are breaking in! Gain stage 4 with balanced connections do very well with the LS 50 Metas and the Maggie LRSs.