I can tell you the Fiio m11 has a very lively and nice but artificially wide and magnified soundstage.
I still would pick it over the slightly more distant and flat ibasso 220.
The 1a, even in stock form, destroy them.
I love all the Audio technica as I started with them, but lately the value for the money is just does not there..
They are very overpriced now as the competition has grown.
I tried those yesterday.
That one was very good.
Did you try the "DMP portable Musical" yet?
So you just prove that the 1a firmware is flatter and less lively.