Toucan PB1 impressions:
I'm very dissatisfied with my PB1, I burned the unit for 200 hrs (Isotek) and evaluated using the line out from an ALO/Sony D25s using Shure SRH840 and Sennheiser HD595 in a SE configuration. The gain switch at factory setting (max) the overall SQ is very metallic and has an exaggerated treble, narrow sound stage and poor instrument separation.
Using the same cables, sources and music I compared it to my other portable the Neco Soundlabs V.2 and the difference in SQ is remarkable. With the NecoV.2 the sound quality is neutral, bass is very deep and the sound stage wide open with pinpoint instrument separation.
Perhaps the PB1 was designed primarily for balanced operation.
I now own a $229 Chinese paper weight, it is unfortunate that most of us are unable to audition the majority of the components on Headfi.org and have to rely on evaluations and impressions from others.