Loq, cannot agree on this, sorry. I have RWAK and T1 and i find this pair hard to fault.
You right in saying RWAK can perform well on his own, and i love it since not every time i want to carry amp.
However when i add T1 it helps a great deal to blacken background space and magically removes some stress from RWAK. The player itself can sound a bit edgy in treble and will go messy on busy recordings and complex transients, if you doubt this please play YES album Magnification compositions 2, 3 and 9 if my memory is correct, you will note what happens to RWAK on the composition called Dreamtime and then perhaps you will better see my point. Otherwise you are welcome to try soundtrack record from movie Eyes wide shut, which is one of my favorite albums to test pricey gear, fun for me and often helps to turn sellers into pale :-)
So i would say T1 for me is not thining out anything but helps to remove small digitis stress from RWAK presentation and blacken space that helps air and timbre and brings naturalness to decay.
Thanks Gintaras, I'll try some further testing. I've posted since that first one that the IC I used was altering the sound, but I haven't done any thorough listening with a different IC. I'll try tomorrow and listen for what you've mentioned.