CONTROLS & FUNCTIONS Controls & Functions 12. B- Terminal (Chassis ground) GND REM BATT POWER To avoid unwanted ignition noise caused by ground loops, it is essential that the Amplifier be grounded to a clean, bare, metal surface of the vehicles chassis. Note : GROUND WIRE SHOULD NOT BE EXTENDED MORE THAN 3 FT (1 METER). 13. Speaker terminals SPEAKER 14.