Since you have multiple sources, you have ruled out that it is a source problem.
Pretty much leaves the speakers (unlikely) amp or preamp. If you had a spare amp or preamp you would have already tried them.
If it was me I would order a Sys from Schiit Audio for $49. This is a passive preamp with input for two sources. While not a high-end piece, it will allow you to enjoy your music and not rush to make decisions while investigating your next moves. I have one that I purchased for exactly this reason. It now sits not used but is available if I need it again.
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