Kenwood KDC-9011 Instruction Manual page 36

Basic Operations of remote
Other features
Optional for the KDC-7011
Function of the KDC-X711/KDC-X811
External Amp Control
Adjust the bass boost level of the external amplifier using the
function appears in the display.
Press the <4 button to search in the other direction.
REMOTE CONTRO UNIT
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