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Ok, yes this sounds like the "thermal noise" (a.k.a. Johnson–Nyquist noise). I've observed similar noise from my KRK RP8 (gen 2) monitor speakers, as well as PreSonus R80's, and even Neumann KH-120 II monitors. Workaround is as I mentioned above: Turn down the powered speaker's internal gain...

It would be helpful to define what you mean by "self-generated noise" here. Is it like a white noise hiss? Or perhaps it's a 60Hz "buzz" or "hum"? If it sounds like a white noise hiss, then this is likely the noise floor of the device itself, also known as the "Johnson–Nyquist noise", or...

Yes, it's a surprisingly complex topic... especially given the "overloaded" term, "balanced" (differential symmetric signaling vs. impedance-balanced) and the deceptively simple concept of "grounding", with it's own often overlooked hidden complexity. Definitely worth it's own topic, as many...

☝️ Which is unfortunately rather common with certain entry-level (a.k.a. "cheapo") turntables. For example, the original AT-LP120-USB phono cartridge signal path has a non-bypassable L-C filter circuit always in place when set to "Phono" mode (e.g. when supposed to bypass the internal preamp)...