Best Answer hulbert , 03 October 2013 - 12:29 AM
Unfortunately I can't see any info in the Line 6 guiide. You might have already seen it somewhere else but I did see that on some reviews, it is said that the ux2 has 50 db max for mic gain. I haven't been able to find anything for the ux1 and as it is a different setup i.e. doesn't have phantom power section like the ux2, it might be a totally different preamp section.
I know that doesn't really help much as its not official and its only for the ux2, but thought I'd mention it as no-one else seems to have the info for you.
This was for the previous ux2 model but here is a link to a review:
DavidGo to the full post