ADS P450.2 Owner's Manual page 12

proper size fuse
less than 18"
from battery
speaker connections for stereo configurations
Minimum recommended impedance is 2 stereo.
Speaker terminals accept up to AWG #12 speaker wire.
speaker connections for bridged configurations
Minimum recommended impedance is 4 when bridged to subwoofers and 3 when bridged to full
range speakers. Speaker terminals accept up to AWG #12 speaker wire.
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