So your Io is hooked up to a separate SS amp with balanced xlr connections and that amp is connected to the high level amp input of the REL’s subwoofer amp ? Where do you have the continuous phase adjustment ? Your single ended rca outputs run from the Io directly to your tubed electrostatic amp ?To clarify I run balanced out from the Io to a SS sub amp that drives the RELs high level. I don't use an intermediary line stage for the Io . I go phono stage direct to my electrostat amps as well.