Adcom GFA-4302 Owner's Manual page 9

In the Mono mode, the LEFT RCA cable connects to A+ input, the
RIGHT RCA
cable connects to
B-
input.
Remember to insert the RCA Shorting
Plugs in the unused inputs. The speaker outputs connect to the speaker as
follows: A + output connects to the Positive(+) speaker terminal; B+ output
connects to the Negative(-) speaker terminal (see Fig. 3).
ADCOM car audio amplifiers are stable driving a 1 Ohm mono load, but
it is not recommended. For best results (maximum SPL and low THD), we
suggest a 2 or 4 Ohm mono load.
BE CERTAIN OF POWER/GROUND CONNECTIONS
Fig. 3