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Phono inputs are not line level, have their own internal amplification and equalization to compensate for a turntable. They have to be grounded to reduce the noise on the low level signal.
Phonograph needles output must be ran through a specific internal EQ in this preamp to bring the low frequencies back to normal state and cancel noise. Plugging a line level input into a phono jack will be loud, clipped, and distorted most likely.
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