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Thanks. Yes, the speaker amp is Class D. The Marantz is a preamp (AV7705).

I'm having a freeze problem on 4K movies also. In my case I can usually get the video back on track after a few minutes of playing with the player's remote. I will try cleaning the disks - see if that helps. Its a brand new player (LG Ultra HD UBK90) - I've only watched two movies on it -...