I have now rearranged my entire setup, abolishing MCL and going for Masterlink. The Beomaster 7000 has had a 6V capacitor replaced, and alll the loudspeakers - Pentas, 4500, and 3500 are gathered in one room. The plan is to get rid of the CXs and the bass unit upstairs, and use the 4500 with the Beocenter 2000 that I have installed upstairs, using this as an entirely separate system. I know that the 4500 are OK, since I have them connected to the Beomaster 7000 right now, as passive speakers. I also know that the 3500 is all right, since I tested that with the Masterlink. Now here is the problem: In spite of everything else working, I cannot get any sound, except for the initial click, out of the Pentas. They work fine with the Beovision 7, and I have connected that via Masterlink to a 1614 box, which is then connected to the AUX on the Beomaster. The settings on the system are OPTION 2 on both A and V, and I am not sure about the SPEAKER setting, having tried 1,0, and 2, but the display on the Beomaster gives no indication, just a noncommittal blink. ChatGPT insists that there must be something wrong with the AUX cable. Oh, and I unscrewed two pins on the DIN from the Beogram 7000, and now can't find them. You would not by any chance know where such can be acquired?