Hi all! Excited to join this forum which I've found while looking for a solution to the following curiosity: I have recently tried to breathe some new life into a Beocenter 2300 w/ Beolab 8000 by hooking it up to a Topping DX3Pro+ DAC / Headphone pre. I have two aux-in cables, one is 3.5mm jack to 7-pin DIN B&O Aux, the other is RCA to 7-pin DIN B&O Aux. When I connect the 3.5mm jack to the headphone out of the Topping (Gain 6.0 dB, volume control at 0.0 dB) I get beautifully clear sound, and I can volume-control the setup through either the input device (phone streaming to Topping via BT), the DAC, or the Beocenter. However, when I connect the RCA to Aux cable to the Topping's stereo line out, I get barely audible sound from the Beocenter (at volumes 40+). Here's the question: Is this known behaviour with the Aux inputs of this generation of B&O equipment? i.e., are they better driven from a headphone out than a line-out because of the headphone out's lower impedance? The other two options would be: faulty RCA to Aux cable (but this one is brand new), or faulty line out on the Topping (which I hope is not the case). Thanks a lot for sharing your insights!