Ok, burn in complete, now for some obs.......
I have the black and red braided cable on the Biggies and the "silver" cable on the Smalls, it started out the opposite way round, but, after listening tests this is how it is for now. The only other significant change was to put Crystalline Audio 'medium core + small tip' tips on instead of the supplied tips; these fit my ears well and give fantastic seal and grip.
Playing through the Pono the Smalls really excel with high quality files Flac or SACD ISO's and I do mean excel; the sound is stop in your tracks lush!
However, for the sake of balance, it only sounds at this level with relatively relaxed music genre's that have a heavy use of acoustic instrumentation, or, are sparse in their instrumentation. When I tried them with other genre's they were not as enjoyable.
This is no surprise and not a problem for me, as I would describe 50% of my musical taste falling in to the preferred genre's.
Examples albums would be Dylan's - Blood On The Tracks, Cooder's - Chicken Skin Music, The Stones - Beggars Banquet, etc
The Biggies played through the Chord Hugo with the Shanling M0 as transport light up with high quality files and the higher output power. They are more dry in terms of presentation, but again if you like this, and I do, they bring a serene listening experience that can make time disappear as multiple albums are savoured.
Again, for the sake of balance, I tried them both "unamped" from my iPhone and I was somewhat non-plussed with either; so, in conclusion...........give them high quality files and a bit of oomph and they can shine - oh, and I quite like the quality and finish on them as well, I have no rough edges, only tight connections and they feel robust and long lasting.