What filter setting do you use on the Marantz Ruby CD/DAC?

There are two filters, labeled simply, Filter 1 and Filter 2.

I left mine default at Filter 1 for a long time.  I flipped on Filter 2 and forgot about the flip.  Later, I'm listening and I think the treble sounds less rolled off on Filter 2--maybe more air too?  

I think these are subtle but I also think I like Filter 2 better. 

Opinions?