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May I ask the E30 Preamp mode, I am not sure that mode is pure pre amp which need external analog input or it means it uses the optical/ USB input and act as dac+ pre amp?
It has no analog inputs, reading the specifications would have pointed that out. When using it with a digital input (usb/any other), it can work as a DAC or as a DAC with variable volume (=pre functionality). That's it.