I upgraded to the firmware no.3 and it also solved my dropping issues completely... BUT I now have trouble having the Compass detected via the USB connection only in Mac OS X. Using the same configuration in Windows 7 plugging in the Compass in the same USB port, it gets detected without any problem. In Mac OS X, though, it seems after a reboot it will never get detected automatically. I realized after a while that starting Audirvana Free would make it work again. Before that, any number of unplugging, replugging, swapping of USB port would make no change...
I tried to analyze the logs in the console, but most of the times, nothings gets added to it when I connect the Compass, even if the device gets detected in Audirvana... weird
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Anyways, I'll try to report soon on the differences I hear with the Dual WM8741, maybe after going back to the ES9018 to confirm my findings. I can already tell you that the description made on the Audio-GD website is pretty much on spot. It is warmer, maybe slightly less detailed than the ES9018, which makes it more forgiving on lesser quality material, but I was starting to love the detail level of the ES9018... So my mind isn't made up about it. It seems they both are "better" for some of my material... If only we could trigger between them with a switch!
I'll be back!