I have a query in with them the past day with 'just' that question.
Well, that and some discrepancies in 'manual's for this one off phono pre. Most notably is that there is an online manual that states that the XLR outputs of this unit (there are RCA and XLR outputs) has a gain of 66 dB vs the 60 dB of the RCAs. And compounding this is that my own manual that I dug out today (a very slight single page offering) specifies 58 dB for the outputs vs 60 dB in every other doc I could find on these i.e. so no differentiation between RCA and XLR out.
Game them the S/N of the unit and asked for clarification on the specs and whether an upgrade possible.
Thanks