Abbingdon Music Research AM-77 Reference Class - Manual (Page 14)

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2.2 AM-77 Rear Panel
R1. SPADE/BANANA outputs: for connection of standard termination speaker cables.
R2. SPEAKON outputs: for connection of Speakon terminated speaker cables.
R3. HIFI/PRO switch: to allow for a source with transformer balanced output*.
R4. INT/POWER amp switch: to alternate between Pre-Main and Power Amplification setings*.
R5. MODE switch: to alternate between Stereo/Monoblock/Bi-Amplification settings*.
R6. INPUT 1: shared XLR and RCA input, for signal input of source equipment.
Warning: ensure no
speaker connector is
in contact with the
chassis
* Please refer to Sec-
tions 3 - 5 for a more
detailed explanation