The tone I was looking for is a fun question, and a predictably complex answer. I tried to make an all-purpose headphone that was equally at home with a symphony, jazz ensemble, pop/rock, electronica, rap, hip-hop, etc. So I deliberately tried for a fuller bottom-end and a warmer midrange closer to our planars. By definition a warmer tone decreases the relevant output of the upper mids and highs, as tone and perception of detail do relate. Lastly, I really wanted to get a lot of dynamics out of the headphone, VOCE really has a lively dynamic range to it, in part due to driver size. Generally I start with drums, then move to vocals, then to electronica, then to symphonic works. When the tone holds and scales across genres I feel like we're done...
We did the voicing using 3 different main amps and 2 energizers, though I had very limited time with the iFI.