The dials go way over 100 on the tuning box for the UE PRM.
I won't say it's the first thing I did, but, okay, actually, the first thing I did was to take one of the dials to over 150 and compare it to 50.
THE CHANGE WAS MILD
Audible, but mild.
It sure as hell wasn't however many dB people are thinking it was. That is definitely not how the tuning box works.
Changing the tuning from 50-50-50 to a tuning of 55-50-45 or what have you is practically nothing.
The tuning system is being way, way overhyped in reviews like Steve Guttenberg's (no surprise). Use of EQ on a DAP is a larger effect than what is possible with the impedance changes for the UE PRM.
Also, I confirmed with a UE rep that each dial does not directly correspond to bass, mids and treble driver groups, but rather each has an effect on the overall impedence measures.