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If 0 dB is its maximum, then -50dB is 50 dB down in power from its maximum (so 10^-5). No m V or other post-fix needed.

That’s true but not that helpful for determining what your ears actually hear.

For music, they hear about 10dB is half/twice as loud.

That’s true but not really helpful for understanding what the amplifier is reading (thanks to nonlinearities down the line.)