Almost all of the above are utter garbage. My company wired recording studios and we interfaced balanced and unbalanced gear all day long. Balanced lines are to increase noise immunity over long runs. Period. No Noise, No Need. There is no inherent sonic quality to balanced vs unbalanced. Improperly done balanced is vastly inferior to a properly done unbalanced.
It's important to know the circuit topologies and how the amps and other components are connected to earth safety.
Some outputs MUST use only one side to connect to unbalanced gear. Other are able to connect one or either phase to 0vA. [Not ground, as so many incorrectly refer to signal reference.] It's only ground if the signal reference is connected to the AC line Earth Safety.
Everyone read and understand https://www.aes.org/standards/comments/drafts/aes48-xxxx-190121-cfc.pdf
PM with any technical questions.