Looking for Speaker Input

+1 on the “not a Luxman problem” notion. Idiotic statement. Likely not a Sopra problem as the two brands pair nicely IMHO but recognize there is room to move up. Need to hear more about room and music type.

Yeah I wish I had 32k for a car.

OP, nothing wrong with your kit. The room has been mentioned as possible cause.If your room has not been treated which I must assume is the case because you haven't provided any info to the contrary, then that aspect should be addressed before any major component swapping.

Changing anything whilst ignoring the acoustics will lead to waste of money, confusion, frustration and possible further lockdowns 😲

Changing cables or adding vibration damping etc. is all helpful but unless the room complies to a known target response you are short-changing yourself. A properly treated room will blow your socks off and you may/probably find your existing speakers are amazing.

@mountainman1953 what exactly is the problem you’re trying to solve here???