Just to be clear: Do NOT use the 1000x powered on, wired, with anything but a smartphone. They are not meant to be used powered on with a powerful dac/amp due to thier pre-set preamp. Only use them powered OFF with amps.
They do however sound very good with a good amp/dac. Preferably a warm sounding one, as the 1000x are really neutral.
The dragonfly 1.2 is not that powerful (it's more of a DAC than an AMP). I'd suggest you sell it and get the new Dragonfly RED. It has a much improved dac, much more powerful amp, and most importantly, it's made to be compatible with smarphones (both IOS and Android), due to the low power consumption. Pair that with a usb female - usb type c/microusb/lightning adapter, and their flash ubs-like size make them the ultimate portable audiophile setup.