How does that combo sound? Do you happen to use a Mac? I am tempted to try the DX100. Looks great.
It sounds glorious.
To be fair I have only had a couple of days and haven't had huge amounts of time to devote to critical listening - I got my son a little r/c helicopter on the same day as the DX100 arrived and he has ensured most of my free time has been spent rescuing the survivors of the Papuan ferry that keeps capsizing off the south coast of Cushion Island.
However my first impressions are that the two play very well together (that's 1350 + DX100, not DX100 + CH-113 Labrador). The DX100 seems to bring out the best of the headphones I've tried with it; the T1 sound stage sound voluminous, the LCDs eerily clear - was looking over my shoulder at one point last night.
Currently listening to the 1350s + DX Hilary Hahn J.S. Bach Violin Concertos - excellent separation, authoritative bass, clear crisp treble. The sound stage is limited by the 1350s obviously. When I get a moment I plan to feed the DX out to the PB2 ( and then DB2-PB2) to try out it's various capabilities in these respects and compare to the previous iBasso offerings.
I use a Macbook, but 99% of the time boot to Windows on it. I do know there are other DX100 owners who use Macs without any issue. Check out the relevant thread - it's pretty much exploded with first impressions over the last couple of days. But I'd wait a week or so until people have sussed everything about the player out before putting much weight on the opinions in there. Like me, most haven't enough time to figure out what's-what just yet.
EDIT:
I forgot to say, one thing I like about this combo is that even with the smaller sound stage of a small closed can, the excellent separation and detail of the DX100 (and the detail of the 1350s) means you don't suffer congestion or smearing. Beethoven's 9th sounds fantastic even if the concert hall is the Ottawa NAC instead of the Sydney Opera House.