Hi. I recently acquired a pair for Beolab 28s. I am trying to connect my turntable to them. Rega Planar 3 with an external Rega Fono Mini A2D Preamp. I am running the RCA cable from the preamp, adding a splitter to a 3.5mm jack, and plugging that into the 3.5 mm line-in port on the primary speaker. I have adjusted the line-in sensitivity in the app and toggled other settings on or off, but there is no sound whatsoever. I have also removed the speakers from stereo mode and just tried each individual speaker, and there is no sound there either. I also tried connecting my iPhone Pro (USB c to 3.5 mm into the speaker), but there was no sound. What am I doing wrong here?