I made a 3,5mm to DIN -cord. Had some 4 pin cord with jack connector from old computer speakers. I Connected pins 1 and 4. Tried to connect my MP4 player (Meizu M6 Miniplayer) to my Palladium, sound was loud and clear. Though the level was INSANE. I had to have my player volume at 4-8 (has 0-40). I know there is two different types, AMP and PLAY, iirc. And the pins 1 & 4 are either IN's or OUT's. I should try some of my other boxes too.