Taken from Burmester documentation.
"The 911 has two balanced inputs, which can also be operated in unbalanced mode sing the two adaptor plugs supplied as standard. Adapter plugs XLR-RCA necessary to connect unbalanced cables to the balanced input terminals. If your components should only offer unbalanced outputs, you are able to use our balanced inputs with the adapter plugs as unbalanced inputs. In these adapter plugs the Pins 2 (negative input) and Pin 1 (ground pin) are connected (see 077 manual - page 8). The pinning of XLR INPUT/OUTPUT is: PIN1=GND, PIN2=NEG, PIN3=POS.
NOTICE: Please do only use BURMESTER XLR-RCA adapter.
CAUTION: As MONO amp the 911MK3 can only be operated in balanced mode!"
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