Abbingdon Music Research PH-77 Reference Class - Manual (Page 10)

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2.2 PH-77 Rear Panel
R1. RCA outputs: for the connection of RCA interconnection cables.
R2. XLR outputs: for the connection of XLR interconnection cables.
R3. DIRECT/NORMAL INPUT: selection of Direct (single input) OR Normal (multiple inputs) vinyl source/sources respectively.
R4. USB output: to archive vinyl using the high-definition 24-Bit/96kHz USB Analogue-to-Digital Converter.
R5. GROUND post: to connect the turntable/phono cable ground wire/s.