Hi. Yes, I think you’re spot on with that. I was plugged into an rca input on the Arcam, and the only way I could get sound was by engaging the stereo direct mode which bypasses all the Arcam’s surround processing modes and the subwoofer. I’ll have to live with it for now as I’m an elderly bloke and I don’t fancy having to lug the amp, which weighs about 16kgs out again!