Thanks to all who replied.

The problem is when streaming from a streamer box which has coax, optical out and line out through onboard dac, problem present with all 3 outputs and persists in left output channel even when switching channels, no such problem with old amp

Bizarre thing- it is prominent mostly when listening to low frequency deep vocals.

They don’t need to. The biggest gaming market is gacha gaming on smartphones. As such - more iphones sold - more money. Why would they bother with making a game console?