Another 140 pro with preamp or power amp in connection?

[ogs]

I'd suggest not. You'd loose most of what Devialet is about. ADH - Analog-Digtal-Hybrid in the power stage. The preamp card is basically output from a DAC, with or without volume control (analog line in goes straight to an ADC for digitizing).
If the 130 or 2x130 is not good enough I suggest you sell the 130 and buy something else entirely.