A further update.
I have been burning in this amp with my Momentum`s. I think it must be 50 hours for Momentums and possibly reaching 70 with the amp.
Theory - Synergy.
I think this amp isn`t for IEM`s, imo. Doesn`t like my W4`s that much still.
I have settled for line out 1 and default for my Momentums. My ears do not like the boost to the highs with either LF or SF on. My ears = my findings, completely personal.
This amp is really making these overheads sound pretty fab, clean, black background. I was really sceptical initially with the harshness/brightness out of the box but it is now finding a purpose. My P3 with my optimal set-up is too neutral for the momentums.
This amp has a colour, slightly bassy and now I hear forward mid`s which is far from a bad thing. There are circumstances where you want to "amp", making the output from source "louder" without any modification.
I suppose I have found a guilty pleasure, bassier, warmer, slightly rolled off highs never getting near sibilant.
I suppose again, this $100, not £100 amp, which runs on air it seems, backs up Fidelity`s reasoning for starting a thread. I am hearing why.
A little side note, I do believe with lithium batteries it is best to charge before they run out, unlike re-chargeable batteries. I have plugged the amp in a few times just to top it up and have not experienced it dead, yet. Leave it on with my Itouch playing while at work, still playing when I get home.
Blimey, 200 of my cigs costs more than this, just to put things in perspective. Nice.