Akai MPC 5000 Reference Manual page 25

This will allow sampling from vinyl. If your turntable requires a preamp, make sure the [LINE/PHONO] switch is set to 'PHONO'. If the turntable
requires grounding, connect the grounding wire to the [PHONO GROUND] nut.
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This connection is a 48 kHz S/PDIF type digital audio signal.
This optical digital output supports 8-channel ADAT format. See 'Setting the ADAT Digital Output' on page 176 for more information on
configuring ADAT output.
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