Update on my ongoing comparison between the Ayre and Berkeley.
On a Mac you can create a Multi-Output Device in Audio MIDI utilities which outputs the same stream to two or more audio devices and compensates for drifting clocks as well. This allows one to play the same piece of music to two USB devices at the same time and A/B between them.
I finally setup both DACs, level matched, same power cords and interconnects to the best A/B comparison I can. The result is that there are some differences in the vocals but for the most part the Ayre QB-9 DSD and Berkeley + AP1 sound very very very close to my ears.
So this solves my problem of finding something that sounds as good but has more inputs.