The addition of the Ifi iTube 2, has made my setup perfect and adds a flexibility for me to experiment. I am running an Airist Audio R-2R Dac hooked up to a THX AAA-789 heapdhone amplifier. This makes for a very analytical and dynamic setup that I do love. However, some headphones that I also love are a bit on the lean side of bass. Adding the iTube 2 in the mix has allowed me to enjoy these headphones for all music i push through it.
I set the bass to +12, regular amount of 3d+, and set the tube type to classic when I use my sony mdr-ex1000 IEMs. This is such a blast.
I have some Koss esp-950 electrostatic headphones. These are very resolving and clean to the max. For electrostats, these are known to be more tuned like loudspeakers. With this in mind they don’t have a very wide soundstage but have very good instrument placement. These too are a little light on bass. I set the bass boost to 6db, regular amount of 3d+ and set the tube type to classic.