Harman Kardon CA140Q - Jacks, Terminals, and Controls Overview; Amplifier Installation Guide

CA140Q
Locate and drill 4 holes corresponding to those in the chassis.
Securely mount the amplifier to the surface with the four 5 mm
tapping screws. Drill undersized holes in the car chassis so
that the 5 mm tapping screws fit tightly.
mm or 1/8 inch diameter holes.
We recommend 3.5
O Power input terminals
@ 20/40 switch
© Speaker terminals
@ 50 Hz boost control
5) Input level control
@ Input jacks