I have Focal Electra 1038 Be's which sound amazing with the Choral system.
Yes the QBD76 is an amazing DAC. I like it so much I bought two one for my speaker system in Spain and one for my headphone systems in the UK.
I also have the Chord Chordette Qute DAC which is also great and synergises very well with the Woo WA3 and WA 6 SE.
The only experience I have had so far with the QBD76 not sounding very good is with the BHSE which a fellow HeadFi.org member kindly brought round to my UK home. The BHSE sounded very flat and dull, no power or energy although it did have respectable sound stage. The QBD76 was connected to the BHSE balanced. I was using my Stax 009's.
The Woo WEE powering my Stax 009's and connected to my Chord Cyan Click Integrated amp connected to my QBD76 sounded 100% better than the BHSE. This is now a big dilema for me as I have ordered in September a BHSE and GS-X Mk2 !